[GitHub] [beam] aromanenko-dev commented on a change in pull request #11459: [BEAM-2546] Add InfluxDbIO

[GitBox <gi...@apache.org>]

aromanenko-dev commented on a change in pull request #11459:
URL: https://github.com/apache/beam/pull/11459#discussion_r449602786



##########
File path: sdks/java/io/influxdb/build.gradle
##########
@@ -0,0 +1,34 @@
+/*
+* Licensed to the Apache Software Foundation (ASF) under one
+* or more contributor license agreements.  See the NOTICE file
+* distributed with this work for additional information
+* regarding copyright ownership.  The ASF licenses this file
+* to you under the Apache License, Version 2.0 (the
+* License); you may not use this file except in compliance
+* with the License.  You may obtain a copy of the License at
+*
+*     http://www.apache.org/licenses/LICENSE-2.0
+*
+* Unless required by applicable law or agreed to in writing, software
+* distributed under the License is distributed on an AS IS BASIS,
+* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+* See the License for the specific language governing permissions and
+* limitations under the License.
+*/
+ 
+plugins { id 'org.apache.beam.module' }
+applyJavaNature(automaticModuleName: 'org.apache.beam.sdk.io.influxdb')
+provideIntegrationTestingDependencies()
+enableJavaPerformanceTesting()
+
+description = "Apache Beam :: SDKs :: Java :: IO :: InfluxDB"
+ext.summary = "IO to read and write on InfluxDB"
+
+dependencies {
+  compile project(path: ":sdks:java:core", configuration: "shadow")
+  compile 'org.influxdb:influxdb-java:2.17'
+  testCompile library.java.junit
+  testRuntimeOnly project(":runners:direct-java")
+  testCompile group: 'org.apache.beam', name: 'beam-runners-direct-java', version: '2.15.0'

Review comment:
       I don't think it's needed. Please, remove

##########
File path: sdks/java/io/influxdb/build.gradle
##########
@@ -0,0 +1,34 @@
+/*
+* Licensed to the Apache Software Foundation (ASF) under one
+* or more contributor license agreements.  See the NOTICE file
+* distributed with this work for additional information
+* regarding copyright ownership.  The ASF licenses this file
+* to you under the Apache License, Version 2.0 (the
+* License); you may not use this file except in compliance
+* with the License.  You may obtain a copy of the License at
+*
+*     http://www.apache.org/licenses/LICENSE-2.0
+*
+* Unless required by applicable law or agreed to in writing, software
+* distributed under the License is distributed on an AS IS BASIS,
+* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+* See the License for the specific language governing permissions and
+* limitations under the License.
+*/
+ 
+plugins { id 'org.apache.beam.module' }
+applyJavaNature(automaticModuleName: 'org.apache.beam.sdk.io.influxdb')
+provideIntegrationTestingDependencies()
+enableJavaPerformanceTesting()
+
+description = "Apache Beam :: SDKs :: Java :: IO :: InfluxDB"
+ext.summary = "IO to read and write on InfluxDB"
+
+dependencies {
+  compile project(path: ":sdks:java:core", configuration: "shadow")
+  compile 'org.influxdb:influxdb-java:2.17'
+  testCompile library.java.junit
+  testRuntimeOnly project(":runners:direct-java")

Review comment:
       ```
   testRuntimeOnly project(path: ":runners:direct-java", configuration: "shadow")
   ```

##########
File path: sdks/java/io/influxdb/src/main/java/org/apache/beam/sdk/io/influxdb/InfluxDBIO.java
##########
@@ -0,0 +1,829 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.apache.beam.sdk.io.influxdb;
+
+import static org.apache.beam.vendor.guava.v26_0_jre.com.google.common.base.Preconditions.checkArgument;
+import static org.influxdb.BatchOptions.DEFAULT_BATCH_INTERVAL_DURATION;
+import static org.influxdb.BatchOptions.DEFAULT_BUFFER_LIMIT;
+
+import com.google.auto.value.AutoValue;
+import java.io.Serializable;
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.Collections;
+import java.util.Iterator;
+import java.util.LinkedHashSet;
+import java.util.List;
+import javax.annotation.Nullable;
+import javax.net.ssl.SSLContext;
+import javax.net.ssl.SSLSocketFactory;
+import javax.net.ssl.TrustManager;
+import javax.net.ssl.X509TrustManager;
+import okhttp3.OkHttpClient;
+import org.apache.beam.sdk.annotations.Experimental;
+import org.apache.beam.sdk.coders.Coder;
+import org.apache.beam.sdk.coders.StringUtf8Coder;
+import org.apache.beam.sdk.io.BoundedSource;
+import org.apache.beam.sdk.options.PipelineOptions;
+import org.apache.beam.sdk.options.ValueProvider;
+import org.apache.beam.sdk.transforms.DoFn;
+import org.apache.beam.sdk.transforms.PTransform;
+import org.apache.beam.sdk.transforms.ParDo;
+import org.apache.beam.sdk.transforms.SerializableFunction;
+import org.apache.beam.sdk.transforms.display.DisplayData;
+import org.apache.beam.sdk.transforms.display.HasDisplayData;
+import org.apache.beam.sdk.values.PBegin;
+import org.apache.beam.sdk.values.PCollection;
+import org.apache.beam.sdk.values.PDone;
+import org.influxdb.BatchOptions;
+import org.influxdb.InfluxDB;
+import org.influxdb.InfluxDBFactory;
+import org.influxdb.dto.Query;
+import org.influxdb.dto.QueryResult;
+import org.influxdb.dto.QueryResult.Result;
+import org.influxdb.dto.QueryResult.Series;
+import org.joda.time.DateTime;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+/**
+ * IO to read and write to InfluxDB.
+ *
+ * <h3>Reading from InfluxDB</h3>
+ *
+ * <p>InfluxDBIO {@link #read()} returns a bounded collection of {@code String} as a {@code
+ * PCollection<String>}.
+ *
+ * <p>you have to provide a {@link DataSourceConfiguration} using<br>
+ * {@link DataSourceConfiguration#create(String, String, String)}(url, userName and password).
+ * Optionally, {@link DataSourceConfiguration#withUsername(String)} and {@link
+ * DataSourceConfiguration#withPassword(String)} allows you to define userName and password.
+ *
+ * <p>For example:
+ *
+ * <pre>{@code
+ * PCollection<String> collection = pipeline.apply(InfluxDBIO.read()
+ *   .withDataSourceConfiguration(InfluxDBIO.DataSourceConfiguration.create(
+ *          "https://localhost:8086","userName","password"))
+ *   .withDatabase("metrics")
+ *   .withRetentionPolicy("autogen")
+ *   .withSslInvalidHostNameAllowed(true)
+ *   .withSslEnabled(true));
+ * }</pre>
+ *
+ * <p>Read with query example:
+ *
+ * <pre>{@code
+ * PCollection<String> collection = pipeline.apply(InfluxDBIO.read()
+ *   .withDataSourceConfiguration(InfluxDBIO.DataSourceConfiguration.create(
+ *          "https://localhost:8086","userName","password"))
+ *   .withDatabase("metrics")
+ *   .withQuery("SELECT * FROM CPU")
+ *   .withRetentionPolicy("autogen")
+ *   .withSslInvalidHostNameAllowed(true)
+ *   .withSslEnabled(true));
+ * }</pre>
+ *
+ * <h3>Writing to InfluxDB </h3>
+ *
+ * <p>InfluxDB sink supports writing records into a database. It writes a {@link PCollection} to the
+ * database by converting each T. The T should implement getLineProtocol() from {@link
+ * LineProtocolConvertable}.
+ *
+ * <p>Like the {@link #read()}, to configure the {@link #write()}, you have to provide a {@link
+ * DataSourceConfiguration}.
+ *
+ * <pre>{@code
+ * pipeline
+ *   .apply(...)
+ *   .apply(InfluxDb.write()
+ *      .withDataSourceConfiguration(InfluxDBIO.DataSourceConfiguration.create(
+ *            "https://localhost:8086","userName","password"))
+ *   .withRetentionPolicy("autogen")
+ *   .withDatabase("metrics")
+ *   .withSslInvalidHostNameAllowed(true)
+ *   .withSslEnabled(true));
+ *    );
+ * }</pre>
+ *
+ * *
+ */
+@Experimental(Experimental.Kind.SOURCE_SINK)
+public class InfluxDBIO {
+  private static final Logger LOG = LoggerFactory.getLogger(InfluxDBIO.class);
+
+  public static Write write() {
+    return new AutoValue_InfluxDBIO_Write.Builder()
+        .setSslEnabled(false)
+        .setSslInvalidHostNameAllowed(false)
+        .setFlushDuration(DEFAULT_BATCH_INTERVAL_DURATION)
+        .setNoOfElementsToBatch(DEFAULT_BUFFER_LIMIT)
+        .build();
+  }
+
+  public static Read read() {
+    return new AutoValue_InfluxDBIO_Read.Builder()
+        .setSslEnabled(false)
+        .setSslInvalidHostNameAllowed(false)
+        .setStartDateTime(DateTime.parse("1677-09-21T00:12:43.145224194Z"))
+        .setEndDateTime(DateTime.parse("2262-04-11T23:47:16.854775806Z"))
+        .setRetentionPolicy("autogen")
+        .build();
+  }
+
+  @AutoValue
+  public abstract static class Read extends PTransform<PBegin, PCollection<String>> {
+
+    abstract boolean sslInvalidHostNameAllowed();
+
+    abstract String retentionPolicy();
+
+    @Nullable
+    abstract String database();
+
+    @Nullable
+    abstract String query();
+
+    abstract boolean sslEnabled();
+
+    @Nullable
+    abstract DataSourceConfiguration dataSourceConfiguration();
+
+    @Nullable
+    abstract List<String> metrics();
+
+    abstract DateTime startDateTime();
+
+    abstract DateTime endDateTime();
+
+    @Nullable
+    abstract DateTime fromDateTime();
+
+    @Nullable
+    abstract DateTime toDateTime();
+
+    abstract Builder builder();
+
+    @AutoValue.Builder
+    abstract static class Builder {
+      abstract Builder setDataSourceConfiguration(DataSourceConfiguration configuration);
+
+      abstract Builder setDatabase(String database);
+
+      abstract Builder setSslInvalidHostNameAllowed(boolean value);
+
+      abstract Builder setRetentionPolicy(String retentionPolicy);
+
+      abstract Builder setQuery(String query);
+
+      abstract Builder setToDateTime(DateTime toDateTime);
+
+      abstract Builder setFromDateTime(DateTime fromDateTime);
+
+      abstract Builder setStartDateTime(DateTime startDateTime);
+
+      abstract Builder setEndDateTime(DateTime endDateTime);
+
+      abstract Builder setSslEnabled(boolean sslEnabled);
+
+      abstract Builder setMetrics(List<String> metrics);
+
+      abstract Read build();
+    }
+
+    /** Reads from the InfluxDB instance indicated by the given configuration. */
+    public Read withDataSourceConfiguration(DataSourceConfiguration configuration) {
+      checkArgument(configuration != null, "configuration can not be null");
+      return builder().setDataSourceConfiguration(configuration).build();
+    }
+
+    /** Reads from the specified database. */
+    public Read withDatabase(String database) {
+      return builder()
+          .setDatabase(database)
+          .setDataSourceConfiguration(dataSourceConfiguration())
+          .build();
+    }
+
+    public Read withToDateTime(DateTime toDateTime) {
+      return builder().setToDateTime(toDateTime).build();
+    }
+
+    public Read withFromDateTime(DateTime fromDateTime) {
+      return builder().setFromDateTime(fromDateTime).build();
+    }
+
+    public Read withStartDateTime(DateTime startDateTime) {
+      return builder().setStartDateTime(startDateTime).build();
+    }
+
+    public Read withEndDateTime(DateTime endDateTime) {
+      return builder().setEndDateTime(endDateTime).build();
+    }
+
+    public Read withMetrics(List<String> metrics) {
+      return builder().setMetrics(metrics).build();
+    }
+
+    public Read withMetrics(String... metrics) {
+      return withMetrics(Arrays.asList(metrics));
+    }
+
+    public Read withSslEnabled(boolean sslEnabled) {
+      return builder().setSslEnabled(sslEnabled).build();
+    }
+
+    public Read withSslInvalidHostNameAllowed(boolean value) {
+      return builder().setSslInvalidHostNameAllowed(value).build();
+    }
+
+    public Read withRetentionPolicy(String retentionPolicy) {
+      return builder().setRetentionPolicy(retentionPolicy).build();
+    }
+
+    public Read withQuery(String query) {
+      return builder().setQuery(query).build();
+    }
+
+    @Override
+    public PCollection<String> expand(PBegin input) {
+      checkArgument(dataSourceConfiguration() != null, "configuration is required");
+      checkArgument(query() != null || database() != null, "database or query is required");
+      if (database() != null) {
+        checkArgument(
+            checkDatabase(
+                database(), dataSourceConfiguration(), sslInvalidHostNameAllowed(), sslEnabled()),
+            "Database %s does not exist",
+            database());
+      }
+      return input.apply(org.apache.beam.sdk.io.Read.from(new InfluxDBSource(this)));
+    }
+
+    @Override
+    public void populateDisplayData(DisplayData.Builder builder) {
+      super.populateDisplayData(builder);
+      builder.addIfNotNull(
+          DisplayData.item("dataSourceConfiguration", dataSourceConfiguration().toString()));
+      builder.addIfNotNull(DisplayData.item("database", database()));
+      builder.addIfNotNull(DisplayData.item("retentionPolicy", retentionPolicy()));
+      builder.addIfNotNull(DisplayData.item("sslEnabled", sslEnabled()));
+      builder.addIfNotNull(DisplayData.item("query", query()));
+      builder.addIfNotNull(
+          DisplayData.item("sslInvalidHostNameAllowed", sslInvalidHostNameAllowed()));
+    }
+  }
+
+  static class InfluxDBSource extends BoundedSource<String> {
+    private final Read spec;
+
+    InfluxDBSource(Read read) {
+      this.spec = read;
+    }
+
+    @Override
+    public long getEstimatedSizeBytes(PipelineOptions pipelineOptions) {
+      String noOfBlocks = "NUMBER OF BLOCKS";
+      String sizeOfBlocks = "SIZE OF BLOCKS";
+      LinkedHashSet<Long> noOfBlocksValue = new LinkedHashSet<>();
+      LinkedHashSet<Long> sizeOfBlocksValue = new LinkedHashSet<>();
+      try (InfluxDB connection =
+          getConnection(
+              spec.dataSourceConfiguration(),
+              spec.sslInvalidHostNameAllowed(),
+              spec.sslEnabled())) {
+        String query = spec.query();
+        if (query == null) {
+          query =
+              String.format(
+                  "SELECT * FROM %s.%s", spec.retentionPolicy(), String.join(",", spec.metrics()));
+        }
+        QueryResult result = connection.query(new Query(query, spec.database()));
+        List<Result> results = result.getResults();
+        for (Result res : results) {
+          for (Series series : res.getSeries()) {
+            for (List<Object> data : series.getValues()) {
+              String s = data.get(0).toString();
+              if (s.startsWith(noOfBlocks)) {
+                noOfBlocksValue.add(Long.parseLong(s.split(":", -1)[1].trim()));
+              }
+              if (s.startsWith(sizeOfBlocks)) {
+                sizeOfBlocksValue.add(Long.parseLong(s.split(":", -1)[1].trim()));
+              }
+            }
+          }
+        }
+      }
+
+      Iterator<Long> noOfBlocksValueItr = noOfBlocksValue.iterator();
+      Iterator<Long> sizeOfBlocksValueItr = sizeOfBlocksValue.iterator();
+      long size = 0;
+      while (noOfBlocksValueItr.hasNext() && sizeOfBlocksValueItr.hasNext()) {
+        size = size + (noOfBlocksValueItr.next() * sizeOfBlocksValueItr.next());
+      }
+      return size;
+    }
+
+    @Override
+    public List<? extends BoundedSource<String>> split(
+        long desiredElementsInABundle, PipelineOptions options) {
+      List<ShardInformation> shardInfo =
+          getDBShardedInformation(
+              spec.database(),
+              spec.dataSourceConfiguration(),
+              spec.sslInvalidHostNameAllowed(),
+              spec.sslEnabled());
+      List<BoundedSource<String>> sources = new ArrayList<>();
+      if (spec.query() == null) {
+        for (ShardInformation sInfo : shardInfo) {
+          if (sInfo.getStartTime().compareTo(spec.startDateTime()) > 0) {
+            sources.add(
+                new InfluxDBSource(
+                    spec.withMetrics(spec.metrics())
+                        .withRetentionPolicy(sInfo.getRetentionPolicy())
+                        .withToDateTime(sInfo.getStartTime())
+                        .withFromDateTime(sInfo.getEndTime())));
+          }
+        }
+      } else {
+        sources.add(this);
+      }
+      return sources;
+    }
+
+    @Override
+    public BoundedReader<String> createReader(PipelineOptions pipelineOptions) {
+      return new BoundedInfluxDbReader(this);
+    }
+
+    @Override
+    public void validate() {
+      spec.validate(null /* input */);
+    }
+
+    @Override
+    public void populateDisplayData(DisplayData.Builder builder) {
+      spec.populateDisplayData(builder);
+    }
+
+    @Override
+    public Coder<String> getOutputCoder() {
+      return StringUtf8Coder.of();
+    }
+  }
+
+  private static String getQueryToRun(Read spec) {
+    if (spec.query() == null) {
+      if (spec.toDateTime() != null && spec.fromDateTime() != null) {
+        return String.format(
+            "SELECT * FROM %s.%s WHERE time >= '%s' and time <= '%s'",
+            spec.retentionPolicy(),
+            String.join(",", spec.metrics()),
+            spec.toDateTime(),
+            spec.fromDateTime());
+      } else {
+        return String.format(
+            "SELECT * FROM %s.%s", spec.retentionPolicy(), String.join(",", spec.metrics()));
+      }
+    }
+    return spec.query();
+  }
+
+  private static class BoundedInfluxDbReader extends BoundedSource.BoundedReader<String> {
+    private final InfluxDBIO.InfluxDBSource source;
+    private Iterator<Result> resultIterator;
+    private Iterator<Series> seriesIterator;
+    private Iterator<List<Object>> valuesIterator;
+    private List current;
+
+    public BoundedInfluxDbReader(InfluxDBIO.InfluxDBSource source) {
+      this.source = source;
+    }
+
+    @Override
+    public boolean start() {
+      InfluxDBIO.Read spec = source.spec;
+      try (InfluxDB influxDB =
+          getConnection(
+              spec.dataSourceConfiguration(),
+              spec.sslInvalidHostNameAllowed(),
+              spec.sslEnabled())) {
+        if (spec.database() != null) {
+          influxDB.setDatabase(spec.database());
+        }
+        if (spec.retentionPolicy() != null) {
+          influxDB.setRetentionPolicy(spec.retentionPolicy());
+        }
+        String query = getQueryToRun(spec);
+        QueryResult queryResult = influxDB.query(new Query(query, spec.database()));
+        resultIterator = queryResult.getResults().iterator();
+        if (resultIterator.hasNext()) {
+          seriesIterator = resultIterator.next().getSeries().iterator();
+        }
+        if (seriesIterator.hasNext()) {
+          valuesIterator = seriesIterator.next().getValues().iterator();
+        }
+      }
+      return advance();
+    }
+
+    @Override
+    public boolean advance() {
+      if (valuesIterator.hasNext()) {
+        current = valuesIterator.next();
+        return true;
+      } else if (seriesIterator.hasNext()) {
+        valuesIterator = seriesIterator.next().getValues().iterator();
+        current = valuesIterator.next();
+        return true;
+      } else if (resultIterator.hasNext()) {
+        seriesIterator = resultIterator.next().getSeries().iterator();
+        valuesIterator = seriesIterator.next().getValues().iterator();
+        current = valuesIterator.next();
+        return true;
+      } else {
+        return false;
+      }
+    }
+
+    @Override
+    public BoundedSource getCurrentSource() {
+      return source;
+    }
+
+    @Override
+    public String getCurrent() {
+      return current.toString();
+    }
+
+    @Override
+    public void close() {}
+  }
+
+  @AutoValue
+  public abstract static class Write extends PTransform<PCollection<String>, PDone> {
+
+    @Override
+    public PDone expand(PCollection<String> input) {
+      checkArgument(dataSourceConfiguration() != null, "withConfiguration() is required");
+      checkArgument(database() != null && !database().isEmpty(), "withDatabase() is required");
+      checkArgument(
+          checkDatabase(
+              database(), dataSourceConfiguration(), sslInvalidHostNameAllowed(), sslEnabled()),
+          "Database %s does not exist",
+          database());
+      input.apply(ParDo.of(new InfluxWriterFn(this)));
+      return PDone.in(input.getPipeline());
+    }
+
+    @Override
+    public void populateDisplayData(DisplayData.Builder builder) {
+      super.populateDisplayData(builder);
+      builder.addIfNotNull(
+          DisplayData.item("dataSourceConfiguration", dataSourceConfiguration().toString()));
+      builder.addIfNotNull(DisplayData.item("database", database()));
+      builder.addIfNotNull(DisplayData.item("retentionPolicy", retentionPolicy()));
+      builder.addIfNotNull(DisplayData.item("sslEnabled", sslEnabled()));
+      builder.addIfNotNull(
+          DisplayData.item("sslInvalidHostNameAllowed", sslInvalidHostNameAllowed()));
+      builder.addIfNotNull(DisplayData.item("noOfElementsToBatch", noOfElementsToBatch()));
+      builder.addIfNotNull(DisplayData.item("flushDuration", flushDuration()));
+    }
+
+    @Nullable
+    abstract String database();
+
+    @Nullable
+    abstract String retentionPolicy();
+
+    abstract boolean sslInvalidHostNameAllowed();
+
+    abstract boolean sslEnabled();
+
+    abstract int noOfElementsToBatch();
+
+    abstract int flushDuration();
+
+    @Nullable
+    abstract DataSourceConfiguration dataSourceConfiguration();
+
+    abstract Builder builder();
+
+    @AutoValue.Builder
+    abstract static class Builder {
+      abstract Builder setDataSourceConfiguration(DataSourceConfiguration configuration);
+
+      abstract Builder setDatabase(String database);
+
+      abstract Builder setSslInvalidHostNameAllowed(boolean value);
+
+      abstract Builder setNoOfElementsToBatch(int noOfElementsToBatch);
+
+      abstract Builder setFlushDuration(int flushDuration);
+
+      abstract Builder setSslEnabled(boolean sslEnabled);
+
+      abstract Builder setRetentionPolicy(String retentionPolicy);
+
+      abstract Write build();
+    }
+
+    public Write withConfiguration(DataSourceConfiguration configuration) {
+      checkArgument(configuration != null, "configuration can not be null");
+      return builder().setDataSourceConfiguration(configuration).build();
+    }
+
+    public Write withDatabase(String database) {
+      return builder().setDatabase(database).build();
+    }
+
+    public Write withSslEnabled(boolean sslEnabled) {
+      return builder().setSslEnabled(sslEnabled).build();
+    }
+
+    public Write withSslInvalidHostNameAllowed(boolean value) {
+      return builder().setSslInvalidHostNameAllowed(value).build();
+    }
+
+    public Write withNoOfElementsToBatch(int noOfElementsToBatch) {
+      return builder().setNoOfElementsToBatch(noOfElementsToBatch).build();
+    }
+
+    public Write withFlushDuration(int flushDuration) {
+      return builder().setFlushDuration(flushDuration).build();
+    }
+
+    public Write withRetentionPolicy(String rp) {
+      return builder().setRetentionPolicy(rp).build();
+    }
+
+    private class InfluxWriterFn<T> extends DoFn<T, Void> {
+
+      private final Write spec;
+      private InfluxDB connection;
+
+      InfluxWriterFn(Write write) {
+        this.spec = write;
+      }
+
+      @Setup
+      public void setup() {
+        connection =
+            getConnection(
+                spec.dataSourceConfiguration(), sslInvalidHostNameAllowed(), sslEnabled());
+        int flushDuration = spec.flushDuration();
+        int noOfBatchPoints = spec.noOfElementsToBatch();
+        connection.enableBatch(
+            BatchOptions.DEFAULTS.actions(noOfBatchPoints).flushDuration(flushDuration));
+        connection.setRetentionPolicy(spec.retentionPolicy());
+        connection.setDatabase(spec.database());
+      }
+
+      @ProcessElement
+      public void processElement(ProcessContext c) {
+        connection.write(c.element().toString());

Review comment:
       Is it a blocking operation?

##########
File path: sdks/java/io/influxdb/src/main/java/org/apache/beam/sdk/io/influxdb/InfluxDBIO.java
##########
@@ -0,0 +1,829 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.apache.beam.sdk.io.influxdb;
+
+import static org.apache.beam.vendor.guava.v26_0_jre.com.google.common.base.Preconditions.checkArgument;
+import static org.influxdb.BatchOptions.DEFAULT_BATCH_INTERVAL_DURATION;
+import static org.influxdb.BatchOptions.DEFAULT_BUFFER_LIMIT;
+
+import com.google.auto.value.AutoValue;
+import java.io.Serializable;
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.Collections;
+import java.util.Iterator;
+import java.util.LinkedHashSet;
+import java.util.List;
+import javax.annotation.Nullable;
+import javax.net.ssl.SSLContext;
+import javax.net.ssl.SSLSocketFactory;
+import javax.net.ssl.TrustManager;
+import javax.net.ssl.X509TrustManager;
+import okhttp3.OkHttpClient;
+import org.apache.beam.sdk.annotations.Experimental;
+import org.apache.beam.sdk.coders.Coder;
+import org.apache.beam.sdk.coders.StringUtf8Coder;
+import org.apache.beam.sdk.io.BoundedSource;
+import org.apache.beam.sdk.options.PipelineOptions;
+import org.apache.beam.sdk.options.ValueProvider;
+import org.apache.beam.sdk.transforms.DoFn;
+import org.apache.beam.sdk.transforms.PTransform;
+import org.apache.beam.sdk.transforms.ParDo;
+import org.apache.beam.sdk.transforms.SerializableFunction;
+import org.apache.beam.sdk.transforms.display.DisplayData;
+import org.apache.beam.sdk.transforms.display.HasDisplayData;
+import org.apache.beam.sdk.values.PBegin;
+import org.apache.beam.sdk.values.PCollection;
+import org.apache.beam.sdk.values.PDone;
+import org.influxdb.BatchOptions;
+import org.influxdb.InfluxDB;
+import org.influxdb.InfluxDBFactory;
+import org.influxdb.dto.Query;
+import org.influxdb.dto.QueryResult;
+import org.influxdb.dto.QueryResult.Result;
+import org.influxdb.dto.QueryResult.Series;
+import org.joda.time.DateTime;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+/**
+ * IO to read and write to InfluxDB.
+ *
+ * <h3>Reading from InfluxDB</h3>
+ *
+ * <p>InfluxDBIO {@link #read()} returns a bounded collection of {@code String} as a {@code
+ * PCollection<String>}.
+ *
+ * <p>you have to provide a {@link DataSourceConfiguration} using<br>
+ * {@link DataSourceConfiguration#create(String, String, String)}(url, userName and password).
+ * Optionally, {@link DataSourceConfiguration#withUsername(String)} and {@link
+ * DataSourceConfiguration#withPassword(String)} allows you to define userName and password.
+ *
+ * <p>For example:
+ *
+ * <pre>{@code
+ * PCollection<String> collection = pipeline.apply(InfluxDBIO.read()
+ *   .withDataSourceConfiguration(InfluxDBIO.DataSourceConfiguration.create(
+ *          "https://localhost:8086","userName","password"))
+ *   .withDatabase("metrics")
+ *   .withRetentionPolicy("autogen")
+ *   .withSslInvalidHostNameAllowed(true)
+ *   .withSslEnabled(true));
+ * }</pre>
+ *
+ * <p>Read with query example:
+ *
+ * <pre>{@code
+ * PCollection<String> collection = pipeline.apply(InfluxDBIO.read()
+ *   .withDataSourceConfiguration(InfluxDBIO.DataSourceConfiguration.create(
+ *          "https://localhost:8086","userName","password"))
+ *   .withDatabase("metrics")
+ *   .withQuery("SELECT * FROM CPU")
+ *   .withRetentionPolicy("autogen")
+ *   .withSslInvalidHostNameAllowed(true)
+ *   .withSslEnabled(true));
+ * }</pre>
+ *
+ * <h3>Writing to InfluxDB </h3>
+ *
+ * <p>InfluxDB sink supports writing records into a database. It writes a {@link PCollection} to the
+ * database by converting each T. The T should implement getLineProtocol() from {@link
+ * LineProtocolConvertable}.
+ *
+ * <p>Like the {@link #read()}, to configure the {@link #write()}, you have to provide a {@link
+ * DataSourceConfiguration}.
+ *
+ * <pre>{@code
+ * pipeline
+ *   .apply(...)
+ *   .apply(InfluxDb.write()
+ *      .withDataSourceConfiguration(InfluxDBIO.DataSourceConfiguration.create(
+ *            "https://localhost:8086","userName","password"))
+ *   .withRetentionPolicy("autogen")
+ *   .withDatabase("metrics")
+ *   .withSslInvalidHostNameAllowed(true)
+ *   .withSslEnabled(true));
+ *    );
+ * }</pre>
+ *
+ * *
+ */
+@Experimental(Experimental.Kind.SOURCE_SINK)
+public class InfluxDBIO {
+  private static final Logger LOG = LoggerFactory.getLogger(InfluxDBIO.class);
+
+  public static Write write() {
+    return new AutoValue_InfluxDBIO_Write.Builder()
+        .setSslEnabled(false)
+        .setSslInvalidHostNameAllowed(false)
+        .setFlushDuration(DEFAULT_BATCH_INTERVAL_DURATION)
+        .setNoOfElementsToBatch(DEFAULT_BUFFER_LIMIT)
+        .build();
+  }
+
+  public static Read read() {
+    return new AutoValue_InfluxDBIO_Read.Builder()
+        .setSslEnabled(false)
+        .setSslInvalidHostNameAllowed(false)
+        .setStartDateTime(DateTime.parse("1677-09-21T00:12:43.145224194Z"))
+        .setEndDateTime(DateTime.parse("2262-04-11T23:47:16.854775806Z"))
+        .setRetentionPolicy("autogen")
+        .build();
+  }
+
+  @AutoValue
+  public abstract static class Read extends PTransform<PBegin, PCollection<String>> {
+
+    abstract boolean sslInvalidHostNameAllowed();
+
+    abstract String retentionPolicy();
+
+    @Nullable
+    abstract String database();
+
+    @Nullable
+    abstract String query();
+
+    abstract boolean sslEnabled();
+
+    @Nullable
+    abstract DataSourceConfiguration dataSourceConfiguration();
+
+    @Nullable
+    abstract List<String> metrics();
+
+    abstract DateTime startDateTime();
+
+    abstract DateTime endDateTime();
+
+    @Nullable
+    abstract DateTime fromDateTime();
+
+    @Nullable
+    abstract DateTime toDateTime();
+
+    abstract Builder builder();
+
+    @AutoValue.Builder
+    abstract static class Builder {
+      abstract Builder setDataSourceConfiguration(DataSourceConfiguration configuration);
+
+      abstract Builder setDatabase(String database);
+
+      abstract Builder setSslInvalidHostNameAllowed(boolean value);
+
+      abstract Builder setRetentionPolicy(String retentionPolicy);
+
+      abstract Builder setQuery(String query);
+
+      abstract Builder setToDateTime(DateTime toDateTime);
+
+      abstract Builder setFromDateTime(DateTime fromDateTime);
+
+      abstract Builder setStartDateTime(DateTime startDateTime);
+
+      abstract Builder setEndDateTime(DateTime endDateTime);
+
+      abstract Builder setSslEnabled(boolean sslEnabled);
+
+      abstract Builder setMetrics(List<String> metrics);
+
+      abstract Read build();
+    }
+
+    /** Reads from the InfluxDB instance indicated by the given configuration. */
+    public Read withDataSourceConfiguration(DataSourceConfiguration configuration) {
+      checkArgument(configuration != null, "configuration can not be null");
+      return builder().setDataSourceConfiguration(configuration).build();
+    }
+
+    /** Reads from the specified database. */
+    public Read withDatabase(String database) {
+      return builder()
+          .setDatabase(database)
+          .setDataSourceConfiguration(dataSourceConfiguration())
+          .build();
+    }
+
+    public Read withToDateTime(DateTime toDateTime) {
+      return builder().setToDateTime(toDateTime).build();
+    }
+
+    public Read withFromDateTime(DateTime fromDateTime) {
+      return builder().setFromDateTime(fromDateTime).build();
+    }
+
+    public Read withStartDateTime(DateTime startDateTime) {
+      return builder().setStartDateTime(startDateTime).build();
+    }
+
+    public Read withEndDateTime(DateTime endDateTime) {
+      return builder().setEndDateTime(endDateTime).build();
+    }
+
+    public Read withMetrics(List<String> metrics) {
+      return builder().setMetrics(metrics).build();
+    }
+
+    public Read withMetrics(String... metrics) {
+      return withMetrics(Arrays.asList(metrics));
+    }
+
+    public Read withSslEnabled(boolean sslEnabled) {
+      return builder().setSslEnabled(sslEnabled).build();
+    }
+
+    public Read withSslInvalidHostNameAllowed(boolean value) {
+      return builder().setSslInvalidHostNameAllowed(value).build();
+    }
+
+    public Read withRetentionPolicy(String retentionPolicy) {
+      return builder().setRetentionPolicy(retentionPolicy).build();
+    }
+
+    public Read withQuery(String query) {
+      return builder().setQuery(query).build();
+    }
+
+    @Override
+    public PCollection<String> expand(PBegin input) {
+      checkArgument(dataSourceConfiguration() != null, "configuration is required");
+      checkArgument(query() != null || database() != null, "database or query is required");
+      if (database() != null) {
+        checkArgument(
+            checkDatabase(
+                database(), dataSourceConfiguration(), sslInvalidHostNameAllowed(), sslEnabled()),
+            "Database %s does not exist",
+            database());
+      }
+      return input.apply(org.apache.beam.sdk.io.Read.from(new InfluxDBSource(this)));
+    }
+
+    @Override
+    public void populateDisplayData(DisplayData.Builder builder) {
+      super.populateDisplayData(builder);
+      builder.addIfNotNull(
+          DisplayData.item("dataSourceConfiguration", dataSourceConfiguration().toString()));
+      builder.addIfNotNull(DisplayData.item("database", database()));
+      builder.addIfNotNull(DisplayData.item("retentionPolicy", retentionPolicy()));
+      builder.addIfNotNull(DisplayData.item("sslEnabled", sslEnabled()));
+      builder.addIfNotNull(DisplayData.item("query", query()));
+      builder.addIfNotNull(
+          DisplayData.item("sslInvalidHostNameAllowed", sslInvalidHostNameAllowed()));
+    }
+  }
+
+  static class InfluxDBSource extends BoundedSource<String> {
+    private final Read spec;
+
+    InfluxDBSource(Read read) {
+      this.spec = read;
+    }
+
+    @Override
+    public long getEstimatedSizeBytes(PipelineOptions pipelineOptions) {
+      String noOfBlocks = "NUMBER OF BLOCKS";
+      String sizeOfBlocks = "SIZE OF BLOCKS";
+      LinkedHashSet<Long> noOfBlocksValue = new LinkedHashSet<>();
+      LinkedHashSet<Long> sizeOfBlocksValue = new LinkedHashSet<>();
+      try (InfluxDB connection =
+          getConnection(
+              spec.dataSourceConfiguration(),
+              spec.sslInvalidHostNameAllowed(),
+              spec.sslEnabled())) {
+        String query = spec.query();
+        if (query == null) {
+          query =
+              String.format(
+                  "SELECT * FROM %s.%s", spec.retentionPolicy(), String.join(",", spec.metrics()));
+        }
+        QueryResult result = connection.query(new Query(query, spec.database()));
+        List<Result> results = result.getResults();
+        for (Result res : results) {
+          for (Series series : res.getSeries()) {
+            for (List<Object> data : series.getValues()) {
+              String s = data.get(0).toString();
+              if (s.startsWith(noOfBlocks)) {
+                noOfBlocksValue.add(Long.parseLong(s.split(":", -1)[1].trim()));
+              }
+              if (s.startsWith(sizeOfBlocks)) {
+                sizeOfBlocksValue.add(Long.parseLong(s.split(":", -1)[1].trim()));
+              }
+            }
+          }
+        }
+      }
+
+      Iterator<Long> noOfBlocksValueItr = noOfBlocksValue.iterator();
+      Iterator<Long> sizeOfBlocksValueItr = sizeOfBlocksValue.iterator();
+      long size = 0;
+      while (noOfBlocksValueItr.hasNext() && sizeOfBlocksValueItr.hasNext()) {
+        size = size + (noOfBlocksValueItr.next() * sizeOfBlocksValueItr.next());
+      }
+      return size;
+    }
+
+    @Override
+    public List<? extends BoundedSource<String>> split(
+        long desiredElementsInABundle, PipelineOptions options) {
+      List<ShardInformation> shardInfo =
+          getDBShardedInformation(
+              spec.database(),
+              spec.dataSourceConfiguration(),
+              spec.sslInvalidHostNameAllowed(),
+              spec.sslEnabled());
+      List<BoundedSource<String>> sources = new ArrayList<>();
+      if (spec.query() == null) {
+        for (ShardInformation sInfo : shardInfo) {
+          if (sInfo.getStartTime().compareTo(spec.startDateTime()) > 0) {
+            sources.add(
+                new InfluxDBSource(
+                    spec.withMetrics(spec.metrics())
+                        .withRetentionPolicy(sInfo.getRetentionPolicy())
+                        .withToDateTime(sInfo.getStartTime())
+                        .withFromDateTime(sInfo.getEndTime())));
+          }
+        }
+      } else {
+        sources.add(this);
+      }
+      return sources;
+    }
+
+    @Override
+    public BoundedReader<String> createReader(PipelineOptions pipelineOptions) {
+      return new BoundedInfluxDbReader(this);
+    }
+
+    @Override
+    public void validate() {
+      spec.validate(null /* input */);
+    }
+
+    @Override
+    public void populateDisplayData(DisplayData.Builder builder) {
+      spec.populateDisplayData(builder);
+    }
+
+    @Override
+    public Coder<String> getOutputCoder() {
+      return StringUtf8Coder.of();
+    }
+  }
+
+  private static String getQueryToRun(Read spec) {
+    if (spec.query() == null) {
+      if (spec.toDateTime() != null && spec.fromDateTime() != null) {
+        return String.format(
+            "SELECT * FROM %s.%s WHERE time >= '%s' and time <= '%s'",
+            spec.retentionPolicy(),
+            String.join(",", spec.metrics()),
+            spec.toDateTime(),
+            spec.fromDateTime());
+      } else {
+        return String.format(
+            "SELECT * FROM %s.%s", spec.retentionPolicy(), String.join(",", spec.metrics()));
+      }
+    }
+    return spec.query();
+  }
+
+  private static class BoundedInfluxDbReader extends BoundedSource.BoundedReader<String> {
+    private final InfluxDBIO.InfluxDBSource source;
+    private Iterator<Result> resultIterator;
+    private Iterator<Series> seriesIterator;
+    private Iterator<List<Object>> valuesIterator;
+    private List current;
+
+    public BoundedInfluxDbReader(InfluxDBIO.InfluxDBSource source) {
+      this.source = source;
+    }
+
+    @Override
+    public boolean start() {
+      InfluxDBIO.Read spec = source.spec;
+      try (InfluxDB influxDB =
+          getConnection(
+              spec.dataSourceConfiguration(),
+              spec.sslInvalidHostNameAllowed(),
+              spec.sslEnabled())) {
+        if (spec.database() != null) {
+          influxDB.setDatabase(spec.database());
+        }
+        if (spec.retentionPolicy() != null) {
+          influxDB.setRetentionPolicy(spec.retentionPolicy());
+        }
+        String query = getQueryToRun(spec);
+        QueryResult queryResult = influxDB.query(new Query(query, spec.database()));
+        resultIterator = queryResult.getResults().iterator();
+        if (resultIterator.hasNext()) {
+          seriesIterator = resultIterator.next().getSeries().iterator();
+        }
+        if (seriesIterator.hasNext()) {
+          valuesIterator = seriesIterator.next().getValues().iterator();
+        }
+      }
+      return advance();
+    }
+
+    @Override
+    public boolean advance() {
+      if (valuesIterator.hasNext()) {
+        current = valuesIterator.next();
+        return true;
+      } else if (seriesIterator.hasNext()) {
+        valuesIterator = seriesIterator.next().getValues().iterator();
+        current = valuesIterator.next();
+        return true;
+      } else if (resultIterator.hasNext()) {
+        seriesIterator = resultIterator.next().getSeries().iterator();
+        valuesIterator = seriesIterator.next().getValues().iterator();
+        current = valuesIterator.next();
+        return true;
+      } else {
+        return false;
+      }
+    }
+
+    @Override
+    public BoundedSource getCurrentSource() {
+      return source;
+    }
+
+    @Override
+    public String getCurrent() {
+      return current.toString();
+    }
+
+    @Override
+    public void close() {}
+  }
+
+  @AutoValue
+  public abstract static class Write extends PTransform<PCollection<String>, PDone> {
+
+    @Override
+    public PDone expand(PCollection<String> input) {
+      checkArgument(dataSourceConfiguration() != null, "withConfiguration() is required");
+      checkArgument(database() != null && !database().isEmpty(), "withDatabase() is required");
+      checkArgument(
+          checkDatabase(
+              database(), dataSourceConfiguration(), sslInvalidHostNameAllowed(), sslEnabled()),
+          "Database %s does not exist",
+          database());
+      input.apply(ParDo.of(new InfluxWriterFn(this)));
+      return PDone.in(input.getPipeline());
+    }
+
+    @Override
+    public void populateDisplayData(DisplayData.Builder builder) {
+      super.populateDisplayData(builder);
+      builder.addIfNotNull(
+          DisplayData.item("dataSourceConfiguration", dataSourceConfiguration().toString()));
+      builder.addIfNotNull(DisplayData.item("database", database()));
+      builder.addIfNotNull(DisplayData.item("retentionPolicy", retentionPolicy()));
+      builder.addIfNotNull(DisplayData.item("sslEnabled", sslEnabled()));
+      builder.addIfNotNull(
+          DisplayData.item("sslInvalidHostNameAllowed", sslInvalidHostNameAllowed()));
+      builder.addIfNotNull(DisplayData.item("noOfElementsToBatch", noOfElementsToBatch()));
+      builder.addIfNotNull(DisplayData.item("flushDuration", flushDuration()));
+    }
+
+    @Nullable
+    abstract String database();
+
+    @Nullable
+    abstract String retentionPolicy();
+
+    abstract boolean sslInvalidHostNameAllowed();
+
+    abstract boolean sslEnabled();
+
+    abstract int noOfElementsToBatch();
+
+    abstract int flushDuration();
+
+    @Nullable
+    abstract DataSourceConfiguration dataSourceConfiguration();
+
+    abstract Builder builder();
+
+    @AutoValue.Builder
+    abstract static class Builder {
+      abstract Builder setDataSourceConfiguration(DataSourceConfiguration configuration);
+
+      abstract Builder setDatabase(String database);
+
+      abstract Builder setSslInvalidHostNameAllowed(boolean value);
+
+      abstract Builder setNoOfElementsToBatch(int noOfElementsToBatch);
+
+      abstract Builder setFlushDuration(int flushDuration);
+
+      abstract Builder setSslEnabled(boolean sslEnabled);
+
+      abstract Builder setRetentionPolicy(String retentionPolicy);
+
+      abstract Write build();
+    }
+
+    public Write withConfiguration(DataSourceConfiguration configuration) {
+      checkArgument(configuration != null, "configuration can not be null");
+      return builder().setDataSourceConfiguration(configuration).build();
+    }
+
+    public Write withDatabase(String database) {
+      return builder().setDatabase(database).build();
+    }
+
+    public Write withSslEnabled(boolean sslEnabled) {
+      return builder().setSslEnabled(sslEnabled).build();
+    }
+
+    public Write withSslInvalidHostNameAllowed(boolean value) {
+      return builder().setSslInvalidHostNameAllowed(value).build();
+    }
+
+    public Write withNoOfElementsToBatch(int noOfElementsToBatch) {
+      return builder().setNoOfElementsToBatch(noOfElementsToBatch).build();
+    }
+
+    public Write withFlushDuration(int flushDuration) {

Review comment:
       Is it needed to allow user to configure this? Can we set just sufficient default value?

##########
File path: sdks/java/io/influxdb/src/main/java/org/apache/beam/sdk/io/influxdb/InfluxDBIO.java
##########
@@ -0,0 +1,829 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.apache.beam.sdk.io.influxdb;
+
+import static org.apache.beam.vendor.guava.v26_0_jre.com.google.common.base.Preconditions.checkArgument;
+import static org.influxdb.BatchOptions.DEFAULT_BATCH_INTERVAL_DURATION;
+import static org.influxdb.BatchOptions.DEFAULT_BUFFER_LIMIT;
+
+import com.google.auto.value.AutoValue;
+import java.io.Serializable;
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.Collections;
+import java.util.Iterator;
+import java.util.LinkedHashSet;
+import java.util.List;
+import javax.annotation.Nullable;
+import javax.net.ssl.SSLContext;
+import javax.net.ssl.SSLSocketFactory;
+import javax.net.ssl.TrustManager;
+import javax.net.ssl.X509TrustManager;
+import okhttp3.OkHttpClient;
+import org.apache.beam.sdk.annotations.Experimental;
+import org.apache.beam.sdk.coders.Coder;
+import org.apache.beam.sdk.coders.StringUtf8Coder;
+import org.apache.beam.sdk.io.BoundedSource;
+import org.apache.beam.sdk.options.PipelineOptions;
+import org.apache.beam.sdk.options.ValueProvider;
+import org.apache.beam.sdk.transforms.DoFn;
+import org.apache.beam.sdk.transforms.PTransform;
+import org.apache.beam.sdk.transforms.ParDo;
+import org.apache.beam.sdk.transforms.SerializableFunction;
+import org.apache.beam.sdk.transforms.display.DisplayData;
+import org.apache.beam.sdk.transforms.display.HasDisplayData;
+import org.apache.beam.sdk.values.PBegin;
+import org.apache.beam.sdk.values.PCollection;
+import org.apache.beam.sdk.values.PDone;
+import org.influxdb.BatchOptions;
+import org.influxdb.InfluxDB;
+import org.influxdb.InfluxDBFactory;
+import org.influxdb.dto.Query;
+import org.influxdb.dto.QueryResult;
+import org.influxdb.dto.QueryResult.Result;
+import org.influxdb.dto.QueryResult.Series;
+import org.joda.time.DateTime;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+/**
+ * IO to read and write to InfluxDB.
+ *
+ * <h3>Reading from InfluxDB</h3>
+ *
+ * <p>InfluxDBIO {@link #read()} returns a bounded collection of {@code String} as a {@code
+ * PCollection<String>}.
+ *
+ * <p>you have to provide a {@link DataSourceConfiguration} using<br>
+ * {@link DataSourceConfiguration#create(String, String, String)}(url, userName and password).
+ * Optionally, {@link DataSourceConfiguration#withUsername(String)} and {@link
+ * DataSourceConfiguration#withPassword(String)} allows you to define userName and password.
+ *
+ * <p>For example:
+ *
+ * <pre>{@code
+ * PCollection<String> collection = pipeline.apply(InfluxDBIO.read()
+ *   .withDataSourceConfiguration(InfluxDBIO.DataSourceConfiguration.create(
+ *          "https://localhost:8086","userName","password"))
+ *   .withDatabase("metrics")
+ *   .withRetentionPolicy("autogen")
+ *   .withSslInvalidHostNameAllowed(true)
+ *   .withSslEnabled(true));
+ * }</pre>
+ *
+ * <p>Read with query example:
+ *
+ * <pre>{@code
+ * PCollection<String> collection = pipeline.apply(InfluxDBIO.read()
+ *   .withDataSourceConfiguration(InfluxDBIO.DataSourceConfiguration.create(
+ *          "https://localhost:8086","userName","password"))
+ *   .withDatabase("metrics")
+ *   .withQuery("SELECT * FROM CPU")
+ *   .withRetentionPolicy("autogen")
+ *   .withSslInvalidHostNameAllowed(true)
+ *   .withSslEnabled(true));
+ * }</pre>
+ *
+ * <h3>Writing to InfluxDB </h3>
+ *
+ * <p>InfluxDB sink supports writing records into a database. It writes a {@link PCollection} to the
+ * database by converting each T. The T should implement getLineProtocol() from {@link
+ * LineProtocolConvertable}.
+ *
+ * <p>Like the {@link #read()}, to configure the {@link #write()}, you have to provide a {@link
+ * DataSourceConfiguration}.
+ *
+ * <pre>{@code
+ * pipeline
+ *   .apply(...)
+ *   .apply(InfluxDb.write()
+ *      .withDataSourceConfiguration(InfluxDBIO.DataSourceConfiguration.create(
+ *            "https://localhost:8086","userName","password"))
+ *   .withRetentionPolicy("autogen")
+ *   .withDatabase("metrics")
+ *   .withSslInvalidHostNameAllowed(true)
+ *   .withSslEnabled(true));
+ *    );
+ * }</pre>
+ *
+ * *
+ */
+@Experimental(Experimental.Kind.SOURCE_SINK)
+public class InfluxDBIO {
+  private static final Logger LOG = LoggerFactory.getLogger(InfluxDBIO.class);
+
+  public static Write write() {
+    return new AutoValue_InfluxDBIO_Write.Builder()
+        .setSslEnabled(false)
+        .setSslInvalidHostNameAllowed(false)
+        .setFlushDuration(DEFAULT_BATCH_INTERVAL_DURATION)
+        .setNoOfElementsToBatch(DEFAULT_BUFFER_LIMIT)
+        .build();
+  }
+
+  public static Read read() {
+    return new AutoValue_InfluxDBIO_Read.Builder()
+        .setSslEnabled(false)
+        .setSslInvalidHostNameAllowed(false)
+        .setStartDateTime(DateTime.parse("1677-09-21T00:12:43.145224194Z"))
+        .setEndDateTime(DateTime.parse("2262-04-11T23:47:16.854775806Z"))
+        .setRetentionPolicy("autogen")
+        .build();
+  }
+
+  @AutoValue
+  public abstract static class Read extends PTransform<PBegin, PCollection<String>> {
+
+    abstract boolean sslInvalidHostNameAllowed();
+
+    abstract String retentionPolicy();
+
+    @Nullable
+    abstract String database();
+
+    @Nullable
+    abstract String query();
+
+    abstract boolean sslEnabled();
+
+    @Nullable
+    abstract DataSourceConfiguration dataSourceConfiguration();
+
+    @Nullable
+    abstract List<String> metrics();
+
+    abstract DateTime startDateTime();
+
+    abstract DateTime endDateTime();
+
+    @Nullable
+    abstract DateTime fromDateTime();
+
+    @Nullable
+    abstract DateTime toDateTime();
+
+    abstract Builder builder();
+
+    @AutoValue.Builder
+    abstract static class Builder {
+      abstract Builder setDataSourceConfiguration(DataSourceConfiguration configuration);
+
+      abstract Builder setDatabase(String database);
+
+      abstract Builder setSslInvalidHostNameAllowed(boolean value);
+
+      abstract Builder setRetentionPolicy(String retentionPolicy);
+
+      abstract Builder setQuery(String query);
+
+      abstract Builder setToDateTime(DateTime toDateTime);
+
+      abstract Builder setFromDateTime(DateTime fromDateTime);
+
+      abstract Builder setStartDateTime(DateTime startDateTime);
+
+      abstract Builder setEndDateTime(DateTime endDateTime);
+
+      abstract Builder setSslEnabled(boolean sslEnabled);
+
+      abstract Builder setMetrics(List<String> metrics);
+
+      abstract Read build();
+    }
+
+    /** Reads from the InfluxDB instance indicated by the given configuration. */
+    public Read withDataSourceConfiguration(DataSourceConfiguration configuration) {
+      checkArgument(configuration != null, "configuration can not be null");
+      return builder().setDataSourceConfiguration(configuration).build();
+    }
+
+    /** Reads from the specified database. */
+    public Read withDatabase(String database) {
+      return builder()
+          .setDatabase(database)
+          .setDataSourceConfiguration(dataSourceConfiguration())
+          .build();
+    }
+
+    public Read withToDateTime(DateTime toDateTime) {
+      return builder().setToDateTime(toDateTime).build();
+    }
+
+    public Read withFromDateTime(DateTime fromDateTime) {
+      return builder().setFromDateTime(fromDateTime).build();
+    }
+
+    public Read withStartDateTime(DateTime startDateTime) {
+      return builder().setStartDateTime(startDateTime).build();
+    }
+
+    public Read withEndDateTime(DateTime endDateTime) {
+      return builder().setEndDateTime(endDateTime).build();
+    }
+
+    public Read withMetrics(List<String> metrics) {
+      return builder().setMetrics(metrics).build();
+    }
+
+    public Read withMetrics(String... metrics) {
+      return withMetrics(Arrays.asList(metrics));
+    }
+
+    public Read withSslEnabled(boolean sslEnabled) {
+      return builder().setSslEnabled(sslEnabled).build();
+    }
+
+    public Read withSslInvalidHostNameAllowed(boolean value) {
+      return builder().setSslInvalidHostNameAllowed(value).build();
+    }
+
+    public Read withRetentionPolicy(String retentionPolicy) {
+      return builder().setRetentionPolicy(retentionPolicy).build();
+    }
+
+    public Read withQuery(String query) {
+      return builder().setQuery(query).build();
+    }
+
+    @Override
+    public PCollection<String> expand(PBegin input) {
+      checkArgument(dataSourceConfiguration() != null, "configuration is required");
+      checkArgument(query() != null || database() != null, "database or query is required");
+      if (database() != null) {
+        checkArgument(
+            checkDatabase(
+                database(), dataSourceConfiguration(), sslInvalidHostNameAllowed(), sslEnabled()),
+            "Database %s does not exist",
+            database());
+      }
+      return input.apply(org.apache.beam.sdk.io.Read.from(new InfluxDBSource(this)));
+    }
+
+    @Override
+    public void populateDisplayData(DisplayData.Builder builder) {
+      super.populateDisplayData(builder);
+      builder.addIfNotNull(
+          DisplayData.item("dataSourceConfiguration", dataSourceConfiguration().toString()));
+      builder.addIfNotNull(DisplayData.item("database", database()));
+      builder.addIfNotNull(DisplayData.item("retentionPolicy", retentionPolicy()));
+      builder.addIfNotNull(DisplayData.item("sslEnabled", sslEnabled()));
+      builder.addIfNotNull(DisplayData.item("query", query()));
+      builder.addIfNotNull(
+          DisplayData.item("sslInvalidHostNameAllowed", sslInvalidHostNameAllowed()));
+    }
+  }
+
+  static class InfluxDBSource extends BoundedSource<String> {
+    private final Read spec;
+
+    InfluxDBSource(Read read) {
+      this.spec = read;
+    }
+
+    @Override
+    public long getEstimatedSizeBytes(PipelineOptions pipelineOptions) {
+      String noOfBlocks = "NUMBER OF BLOCKS";
+      String sizeOfBlocks = "SIZE OF BLOCKS";
+      LinkedHashSet<Long> noOfBlocksValue = new LinkedHashSet<>();

Review comment:
       nit: `numOfBlocksValue `

##########
File path: sdks/java/io/influxdb/src/main/java/org/apache/beam/sdk/io/influxdb/InfluxDBIO.java
##########
@@ -0,0 +1,829 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.apache.beam.sdk.io.influxdb;
+
+import static org.apache.beam.vendor.guava.v26_0_jre.com.google.common.base.Preconditions.checkArgument;
+import static org.influxdb.BatchOptions.DEFAULT_BATCH_INTERVAL_DURATION;
+import static org.influxdb.BatchOptions.DEFAULT_BUFFER_LIMIT;
+
+import com.google.auto.value.AutoValue;
+import java.io.Serializable;
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.Collections;
+import java.util.Iterator;
+import java.util.LinkedHashSet;
+import java.util.List;
+import javax.annotation.Nullable;
+import javax.net.ssl.SSLContext;
+import javax.net.ssl.SSLSocketFactory;
+import javax.net.ssl.TrustManager;
+import javax.net.ssl.X509TrustManager;
+import okhttp3.OkHttpClient;
+import org.apache.beam.sdk.annotations.Experimental;
+import org.apache.beam.sdk.coders.Coder;
+import org.apache.beam.sdk.coders.StringUtf8Coder;
+import org.apache.beam.sdk.io.BoundedSource;
+import org.apache.beam.sdk.options.PipelineOptions;
+import org.apache.beam.sdk.options.ValueProvider;
+import org.apache.beam.sdk.transforms.DoFn;
+import org.apache.beam.sdk.transforms.PTransform;
+import org.apache.beam.sdk.transforms.ParDo;
+import org.apache.beam.sdk.transforms.SerializableFunction;
+import org.apache.beam.sdk.transforms.display.DisplayData;
+import org.apache.beam.sdk.transforms.display.HasDisplayData;
+import org.apache.beam.sdk.values.PBegin;
+import org.apache.beam.sdk.values.PCollection;
+import org.apache.beam.sdk.values.PDone;
+import org.influxdb.BatchOptions;
+import org.influxdb.InfluxDB;
+import org.influxdb.InfluxDBFactory;
+import org.influxdb.dto.Query;
+import org.influxdb.dto.QueryResult;
+import org.influxdb.dto.QueryResult.Result;
+import org.influxdb.dto.QueryResult.Series;
+import org.joda.time.DateTime;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+/**
+ * IO to read and write to InfluxDB.
+ *
+ * <h3>Reading from InfluxDB</h3>
+ *
+ * <p>InfluxDBIO {@link #read()} returns a bounded collection of {@code String} as a {@code
+ * PCollection<String>}.
+ *
+ * <p>you have to provide a {@link DataSourceConfiguration} using<br>
+ * {@link DataSourceConfiguration#create(String, String, String)}(url, userName and password).
+ * Optionally, {@link DataSourceConfiguration#withUsername(String)} and {@link
+ * DataSourceConfiguration#withPassword(String)} allows you to define userName and password.
+ *
+ * <p>For example:
+ *
+ * <pre>{@code
+ * PCollection<String> collection = pipeline.apply(InfluxDBIO.read()
+ *   .withDataSourceConfiguration(InfluxDBIO.DataSourceConfiguration.create(
+ *          "https://localhost:8086","userName","password"))
+ *   .withDatabase("metrics")
+ *   .withRetentionPolicy("autogen")
+ *   .withSslInvalidHostNameAllowed(true)
+ *   .withSslEnabled(true));
+ * }</pre>
+ *
+ * <p>Read with query example:
+ *
+ * <pre>{@code
+ * PCollection<String> collection = pipeline.apply(InfluxDBIO.read()
+ *   .withDataSourceConfiguration(InfluxDBIO.DataSourceConfiguration.create(
+ *          "https://localhost:8086","userName","password"))
+ *   .withDatabase("metrics")
+ *   .withQuery("SELECT * FROM CPU")
+ *   .withRetentionPolicy("autogen")
+ *   .withSslInvalidHostNameAllowed(true)
+ *   .withSslEnabled(true));
+ * }</pre>
+ *
+ * <h3>Writing to InfluxDB </h3>
+ *
+ * <p>InfluxDB sink supports writing records into a database. It writes a {@link PCollection} to the
+ * database by converting each T. The T should implement getLineProtocol() from {@link
+ * LineProtocolConvertable}.
+ *
+ * <p>Like the {@link #read()}, to configure the {@link #write()}, you have to provide a {@link
+ * DataSourceConfiguration}.
+ *
+ * <pre>{@code
+ * pipeline
+ *   .apply(...)
+ *   .apply(InfluxDb.write()
+ *      .withDataSourceConfiguration(InfluxDBIO.DataSourceConfiguration.create(
+ *            "https://localhost:8086","userName","password"))
+ *   .withRetentionPolicy("autogen")
+ *   .withDatabase("metrics")
+ *   .withSslInvalidHostNameAllowed(true)
+ *   .withSslEnabled(true));
+ *    );
+ * }</pre>
+ *
+ * *
+ */
+@Experimental(Experimental.Kind.SOURCE_SINK)
+public class InfluxDBIO {
+  private static final Logger LOG = LoggerFactory.getLogger(InfluxDBIO.class);
+
+  public static Write write() {
+    return new AutoValue_InfluxDBIO_Write.Builder()
+        .setSslEnabled(false)
+        .setSslInvalidHostNameAllowed(false)
+        .setFlushDuration(DEFAULT_BATCH_INTERVAL_DURATION)
+        .setNoOfElementsToBatch(DEFAULT_BUFFER_LIMIT)
+        .build();
+  }
+
+  public static Read read() {
+    return new AutoValue_InfluxDBIO_Read.Builder()
+        .setSslEnabled(false)
+        .setSslInvalidHostNameAllowed(false)
+        .setStartDateTime(DateTime.parse("1677-09-21T00:12:43.145224194Z"))
+        .setEndDateTime(DateTime.parse("2262-04-11T23:47:16.854775806Z"))
+        .setRetentionPolicy("autogen")
+        .build();
+  }
+
+  @AutoValue
+  public abstract static class Read extends PTransform<PBegin, PCollection<String>> {
+
+    abstract boolean sslInvalidHostNameAllowed();
+
+    abstract String retentionPolicy();
+
+    @Nullable
+    abstract String database();
+
+    @Nullable
+    abstract String query();
+
+    abstract boolean sslEnabled();
+
+    @Nullable
+    abstract DataSourceConfiguration dataSourceConfiguration();
+
+    @Nullable
+    abstract List<String> metrics();
+
+    abstract DateTime startDateTime();
+
+    abstract DateTime endDateTime();
+
+    @Nullable
+    abstract DateTime fromDateTime();
+
+    @Nullable
+    abstract DateTime toDateTime();
+
+    abstract Builder builder();
+
+    @AutoValue.Builder
+    abstract static class Builder {
+      abstract Builder setDataSourceConfiguration(DataSourceConfiguration configuration);
+
+      abstract Builder setDatabase(String database);
+
+      abstract Builder setSslInvalidHostNameAllowed(boolean value);
+
+      abstract Builder setRetentionPolicy(String retentionPolicy);
+
+      abstract Builder setQuery(String query);
+
+      abstract Builder setToDateTime(DateTime toDateTime);
+
+      abstract Builder setFromDateTime(DateTime fromDateTime);
+
+      abstract Builder setStartDateTime(DateTime startDateTime);
+
+      abstract Builder setEndDateTime(DateTime endDateTime);
+
+      abstract Builder setSslEnabled(boolean sslEnabled);
+
+      abstract Builder setMetrics(List<String> metrics);
+
+      abstract Read build();
+    }
+
+    /** Reads from the InfluxDB instance indicated by the given configuration. */
+    public Read withDataSourceConfiguration(DataSourceConfiguration configuration) {
+      checkArgument(configuration != null, "configuration can not be null");
+      return builder().setDataSourceConfiguration(configuration).build();
+    }
+
+    /** Reads from the specified database. */
+    public Read withDatabase(String database) {
+      return builder()
+          .setDatabase(database)
+          .setDataSourceConfiguration(dataSourceConfiguration())
+          .build();
+    }
+
+    public Read withToDateTime(DateTime toDateTime) {
+      return builder().setToDateTime(toDateTime).build();
+    }
+
+    public Read withFromDateTime(DateTime fromDateTime) {
+      return builder().setFromDateTime(fromDateTime).build();
+    }
+
+    public Read withStartDateTime(DateTime startDateTime) {
+      return builder().setStartDateTime(startDateTime).build();
+    }
+
+    public Read withEndDateTime(DateTime endDateTime) {
+      return builder().setEndDateTime(endDateTime).build();
+    }
+
+    public Read withMetrics(List<String> metrics) {
+      return builder().setMetrics(metrics).build();
+    }
+
+    public Read withMetrics(String... metrics) {
+      return withMetrics(Arrays.asList(metrics));
+    }
+
+    public Read withSslEnabled(boolean sslEnabled) {
+      return builder().setSslEnabled(sslEnabled).build();
+    }
+
+    public Read withSslInvalidHostNameAllowed(boolean value) {
+      return builder().setSslInvalidHostNameAllowed(value).build();
+    }
+
+    public Read withRetentionPolicy(String retentionPolicy) {
+      return builder().setRetentionPolicy(retentionPolicy).build();
+    }
+
+    public Read withQuery(String query) {
+      return builder().setQuery(query).build();
+    }
+
+    @Override
+    public PCollection<String> expand(PBegin input) {
+      checkArgument(dataSourceConfiguration() != null, "configuration is required");
+      checkArgument(query() != null || database() != null, "database or query is required");
+      if (database() != null) {
+        checkArgument(
+            checkDatabase(
+                database(), dataSourceConfiguration(), sslInvalidHostNameAllowed(), sslEnabled()),
+            "Database %s does not exist",
+            database());
+      }
+      return input.apply(org.apache.beam.sdk.io.Read.from(new InfluxDBSource(this)));
+    }
+
+    @Override
+    public void populateDisplayData(DisplayData.Builder builder) {
+      super.populateDisplayData(builder);
+      builder.addIfNotNull(
+          DisplayData.item("dataSourceConfiguration", dataSourceConfiguration().toString()));
+      builder.addIfNotNull(DisplayData.item("database", database()));
+      builder.addIfNotNull(DisplayData.item("retentionPolicy", retentionPolicy()));
+      builder.addIfNotNull(DisplayData.item("sslEnabled", sslEnabled()));
+      builder.addIfNotNull(DisplayData.item("query", query()));
+      builder.addIfNotNull(
+          DisplayData.item("sslInvalidHostNameAllowed", sslInvalidHostNameAllowed()));
+    }
+  }
+
+  static class InfluxDBSource extends BoundedSource<String> {
+    private final Read spec;
+
+    InfluxDBSource(Read read) {
+      this.spec = read;
+    }
+
+    @Override
+    public long getEstimatedSizeBytes(PipelineOptions pipelineOptions) {
+      String noOfBlocks = "NUMBER OF BLOCKS";
+      String sizeOfBlocks = "SIZE OF BLOCKS";
+      LinkedHashSet<Long> noOfBlocksValue = new LinkedHashSet<>();
+      LinkedHashSet<Long> sizeOfBlocksValue = new LinkedHashSet<>();
+      try (InfluxDB connection =
+          getConnection(
+              spec.dataSourceConfiguration(),
+              spec.sslInvalidHostNameAllowed(),
+              spec.sslEnabled())) {
+        String query = spec.query();
+        if (query == null) {
+          query =
+              String.format(
+                  "SELECT * FROM %s.%s", spec.retentionPolicy(), String.join(",", spec.metrics()));
+        }
+        QueryResult result = connection.query(new Query(query, spec.database()));
+        List<Result> results = result.getResults();
+        for (Result res : results) {
+          for (Series series : res.getSeries()) {
+            for (List<Object> data : series.getValues()) {
+              String s = data.get(0).toString();
+              if (s.startsWith(noOfBlocks)) {
+                noOfBlocksValue.add(Long.parseLong(s.split(":", -1)[1].trim()));
+              }
+              if (s.startsWith(sizeOfBlocks)) {
+                sizeOfBlocksValue.add(Long.parseLong(s.split(":", -1)[1].trim()));
+              }
+            }
+          }
+        }
+      }
+
+      Iterator<Long> noOfBlocksValueItr = noOfBlocksValue.iterator();
+      Iterator<Long> sizeOfBlocksValueItr = sizeOfBlocksValue.iterator();
+      long size = 0;
+      while (noOfBlocksValueItr.hasNext() && sizeOfBlocksValueItr.hasNext()) {
+        size = size + (noOfBlocksValueItr.next() * sizeOfBlocksValueItr.next());
+      }
+      return size;
+    }
+
+    @Override
+    public List<? extends BoundedSource<String>> split(
+        long desiredElementsInABundle, PipelineOptions options) {
+      List<ShardInformation> shardInfo =
+          getDBShardedInformation(
+              spec.database(),
+              spec.dataSourceConfiguration(),
+              spec.sslInvalidHostNameAllowed(),
+              spec.sslEnabled());
+      List<BoundedSource<String>> sources = new ArrayList<>();
+      if (spec.query() == null) {
+        for (ShardInformation sInfo : shardInfo) {
+          if (sInfo.getStartTime().compareTo(spec.startDateTime()) > 0) {
+            sources.add(
+                new InfluxDBSource(
+                    spec.withMetrics(spec.metrics())
+                        .withRetentionPolicy(sInfo.getRetentionPolicy())
+                        .withToDateTime(sInfo.getStartTime())
+                        .withFromDateTime(sInfo.getEndTime())));
+          }
+        }
+      } else {
+        sources.add(this);

Review comment:
       It's not possible to split with query?

##########
File path: sdks/java/io/influxdb/build.gradle
##########
@@ -0,0 +1,34 @@
+/*
+* Licensed to the Apache Software Foundation (ASF) under one
+* or more contributor license agreements.  See the NOTICE file
+* distributed with this work for additional information
+* regarding copyright ownership.  The ASF licenses this file
+* to you under the Apache License, Version 2.0 (the
+* License); you may not use this file except in compliance
+* with the License.  You may obtain a copy of the License at
+*
+*     http://www.apache.org/licenses/LICENSE-2.0
+*
+* Unless required by applicable law or agreed to in writing, software
+* distributed under the License is distributed on an AS IS BASIS,
+* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+* See the License for the specific language governing permissions and
+* limitations under the License.
+*/
+ 
+plugins { id 'org.apache.beam.module' }
+applyJavaNature(automaticModuleName: 'org.apache.beam.sdk.io.influxdb')
+provideIntegrationTestingDependencies()
+enableJavaPerformanceTesting()
+
+description = "Apache Beam :: SDKs :: Java :: IO :: InfluxDB"
+ext.summary = "IO to read and write on InfluxDB"
+
+dependencies {
+  compile project(path: ":sdks:java:core", configuration: "shadow")
+  compile 'org.influxdb:influxdb-java:2.17'

Review comment:
       Please, extract it as entity of `project.ext.library` in `BeamModulePlugin.groovy`

##########
File path: sdks/java/io/influxdb/src/main/java/org/apache/beam/sdk/io/influxdb/DBShardInformation.java
##########
@@ -0,0 +1,48 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.apache.beam.sdk.io.influxdb;
+
+import java.util.ArrayList;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+import org.influxdb.dto.QueryResult.Series;
+
+public class DBShardInformation {

Review comment:
       Add class Javadoc and remove `public`

##########
File path: sdks/java/io/influxdb/src/main/java/org/apache/beam/sdk/io/influxdb/LineProtocolConvertable.java
##########
@@ -0,0 +1,22 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.apache.beam.sdk.io.influxdb;
+
+public interface LineProtocolConvertable {

Review comment:
       Please, add class Javadoc

##########
File path: sdks/java/io/influxdb/src/main/java/org/apache/beam/sdk/io/influxdb/ShardInformation.java
##########
@@ -0,0 +1,88 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.apache.beam.sdk.io.influxdb;
+
+import java.util.List;
+import java.util.Objects;
+import org.joda.time.DateTime;
+
+public class ShardInformation implements Comparable {

Review comment:
       Please, add class Javadoc

##########
File path: sdks/java/io/influxdb/src/main/java/org/apache/beam/sdk/io/influxdb/InfluxDBIO.java
##########
@@ -0,0 +1,829 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.apache.beam.sdk.io.influxdb;
+
+import static org.apache.beam.vendor.guava.v26_0_jre.com.google.common.base.Preconditions.checkArgument;
+import static org.influxdb.BatchOptions.DEFAULT_BATCH_INTERVAL_DURATION;
+import static org.influxdb.BatchOptions.DEFAULT_BUFFER_LIMIT;
+
+import com.google.auto.value.AutoValue;
+import java.io.Serializable;
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.Collections;
+import java.util.Iterator;
+import java.util.LinkedHashSet;
+import java.util.List;
+import javax.annotation.Nullable;
+import javax.net.ssl.SSLContext;
+import javax.net.ssl.SSLSocketFactory;
+import javax.net.ssl.TrustManager;
+import javax.net.ssl.X509TrustManager;
+import okhttp3.OkHttpClient;
+import org.apache.beam.sdk.annotations.Experimental;
+import org.apache.beam.sdk.coders.Coder;
+import org.apache.beam.sdk.coders.StringUtf8Coder;
+import org.apache.beam.sdk.io.BoundedSource;
+import org.apache.beam.sdk.options.PipelineOptions;
+import org.apache.beam.sdk.options.ValueProvider;
+import org.apache.beam.sdk.transforms.DoFn;
+import org.apache.beam.sdk.transforms.PTransform;
+import org.apache.beam.sdk.transforms.ParDo;
+import org.apache.beam.sdk.transforms.SerializableFunction;
+import org.apache.beam.sdk.transforms.display.DisplayData;
+import org.apache.beam.sdk.transforms.display.HasDisplayData;
+import org.apache.beam.sdk.values.PBegin;
+import org.apache.beam.sdk.values.PCollection;
+import org.apache.beam.sdk.values.PDone;
+import org.influxdb.BatchOptions;
+import org.influxdb.InfluxDB;
+import org.influxdb.InfluxDBFactory;
+import org.influxdb.dto.Query;
+import org.influxdb.dto.QueryResult;
+import org.influxdb.dto.QueryResult.Result;
+import org.influxdb.dto.QueryResult.Series;
+import org.joda.time.DateTime;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+/**
+ * IO to read and write to InfluxDB.
+ *
+ * <h3>Reading from InfluxDB</h3>
+ *
+ * <p>InfluxDBIO {@link #read()} returns a bounded collection of {@code String} as a {@code
+ * PCollection<String>}.
+ *
+ * <p>you have to provide a {@link DataSourceConfiguration} using<br>
+ * {@link DataSourceConfiguration#create(String, String, String)}(url, userName and password).
+ * Optionally, {@link DataSourceConfiguration#withUsername(String)} and {@link
+ * DataSourceConfiguration#withPassword(String)} allows you to define userName and password.
+ *
+ * <p>For example:
+ *
+ * <pre>{@code
+ * PCollection<String> collection = pipeline.apply(InfluxDBIO.read()
+ *   .withDataSourceConfiguration(InfluxDBIO.DataSourceConfiguration.create(
+ *          "https://localhost:8086","userName","password"))
+ *   .withDatabase("metrics")
+ *   .withRetentionPolicy("autogen")
+ *   .withSslInvalidHostNameAllowed(true)
+ *   .withSslEnabled(true));
+ * }</pre>
+ *
+ * <p>Read with query example:
+ *
+ * <pre>{@code
+ * PCollection<String> collection = pipeline.apply(InfluxDBIO.read()
+ *   .withDataSourceConfiguration(InfluxDBIO.DataSourceConfiguration.create(
+ *          "https://localhost:8086","userName","password"))
+ *   .withDatabase("metrics")
+ *   .withQuery("SELECT * FROM CPU")
+ *   .withRetentionPolicy("autogen")
+ *   .withSslInvalidHostNameAllowed(true)
+ *   .withSslEnabled(true));
+ * }</pre>
+ *
+ * <h3>Writing to InfluxDB </h3>
+ *
+ * <p>InfluxDB sink supports writing records into a database. It writes a {@link PCollection} to the
+ * database by converting each T. The T should implement getLineProtocol() from {@link
+ * LineProtocolConvertable}.
+ *
+ * <p>Like the {@link #read()}, to configure the {@link #write()}, you have to provide a {@link
+ * DataSourceConfiguration}.
+ *
+ * <pre>{@code
+ * pipeline
+ *   .apply(...)
+ *   .apply(InfluxDb.write()
+ *      .withDataSourceConfiguration(InfluxDBIO.DataSourceConfiguration.create(
+ *            "https://localhost:8086","userName","password"))
+ *   .withRetentionPolicy("autogen")
+ *   .withDatabase("metrics")
+ *   .withSslInvalidHostNameAllowed(true)
+ *   .withSslEnabled(true));
+ *    );
+ * }</pre>
+ *
+ * *
+ */
+@Experimental(Experimental.Kind.SOURCE_SINK)
+public class InfluxDBIO {

Review comment:
       Please, rename the class name to _Influx**Db**IO_ to be compatible with other IOs, like _Mongo**Db**IO_

##########
File path: sdks/java/io/influxdb/src/main/java/org/apache/beam/sdk/io/influxdb/InfluxDBIO.java
##########
@@ -0,0 +1,829 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.apache.beam.sdk.io.influxdb;
+
+import static org.apache.beam.vendor.guava.v26_0_jre.com.google.common.base.Preconditions.checkArgument;
+import static org.influxdb.BatchOptions.DEFAULT_BATCH_INTERVAL_DURATION;
+import static org.influxdb.BatchOptions.DEFAULT_BUFFER_LIMIT;
+
+import com.google.auto.value.AutoValue;
+import java.io.Serializable;
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.Collections;
+import java.util.Iterator;
+import java.util.LinkedHashSet;
+import java.util.List;
+import javax.annotation.Nullable;
+import javax.net.ssl.SSLContext;
+import javax.net.ssl.SSLSocketFactory;
+import javax.net.ssl.TrustManager;
+import javax.net.ssl.X509TrustManager;
+import okhttp3.OkHttpClient;
+import org.apache.beam.sdk.annotations.Experimental;
+import org.apache.beam.sdk.coders.Coder;
+import org.apache.beam.sdk.coders.StringUtf8Coder;
+import org.apache.beam.sdk.io.BoundedSource;
+import org.apache.beam.sdk.options.PipelineOptions;
+import org.apache.beam.sdk.options.ValueProvider;
+import org.apache.beam.sdk.transforms.DoFn;
+import org.apache.beam.sdk.transforms.PTransform;
+import org.apache.beam.sdk.transforms.ParDo;
+import org.apache.beam.sdk.transforms.SerializableFunction;
+import org.apache.beam.sdk.transforms.display.DisplayData;
+import org.apache.beam.sdk.transforms.display.HasDisplayData;
+import org.apache.beam.sdk.values.PBegin;
+import org.apache.beam.sdk.values.PCollection;
+import org.apache.beam.sdk.values.PDone;
+import org.influxdb.BatchOptions;
+import org.influxdb.InfluxDB;
+import org.influxdb.InfluxDBFactory;
+import org.influxdb.dto.Query;
+import org.influxdb.dto.QueryResult;
+import org.influxdb.dto.QueryResult.Result;
+import org.influxdb.dto.QueryResult.Series;
+import org.joda.time.DateTime;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+/**
+ * IO to read and write to InfluxDB.
+ *
+ * <h3>Reading from InfluxDB</h3>
+ *
+ * <p>InfluxDBIO {@link #read()} returns a bounded collection of {@code String} as a {@code
+ * PCollection<String>}.
+ *
+ * <p>you have to provide a {@link DataSourceConfiguration} using<br>

Review comment:
       nit: "**Y**ou have ..."

##########
File path: sdks/java/io/influxdb/src/main/java/org/apache/beam/sdk/io/influxdb/DBShardInformation.java
##########
@@ -0,0 +1,48 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.apache.beam.sdk.io.influxdb;
+
+import java.util.ArrayList;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+import org.influxdb.dto.QueryResult.Series;
+
+public class DBShardInformation {
+
+  private Map<String, List<ShardInformation>> shardInformation = new HashMap<>();
+
+  public DBShardInformation() {}

Review comment:
       This class can be package-private.

##########
File path: sdks/java/io/influxdb/src/main/java/org/apache/beam/sdk/io/influxdb/InfluxDBIO.java
##########
@@ -0,0 +1,829 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.apache.beam.sdk.io.influxdb;
+
+import static org.apache.beam.vendor.guava.v26_0_jre.com.google.common.base.Preconditions.checkArgument;
+import static org.influxdb.BatchOptions.DEFAULT_BATCH_INTERVAL_DURATION;
+import static org.influxdb.BatchOptions.DEFAULT_BUFFER_LIMIT;
+
+import com.google.auto.value.AutoValue;
+import java.io.Serializable;
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.Collections;
+import java.util.Iterator;
+import java.util.LinkedHashSet;
+import java.util.List;
+import javax.annotation.Nullable;
+import javax.net.ssl.SSLContext;
+import javax.net.ssl.SSLSocketFactory;
+import javax.net.ssl.TrustManager;
+import javax.net.ssl.X509TrustManager;
+import okhttp3.OkHttpClient;
+import org.apache.beam.sdk.annotations.Experimental;
+import org.apache.beam.sdk.coders.Coder;
+import org.apache.beam.sdk.coders.StringUtf8Coder;
+import org.apache.beam.sdk.io.BoundedSource;
+import org.apache.beam.sdk.options.PipelineOptions;
+import org.apache.beam.sdk.options.ValueProvider;
+import org.apache.beam.sdk.transforms.DoFn;
+import org.apache.beam.sdk.transforms.PTransform;
+import org.apache.beam.sdk.transforms.ParDo;
+import org.apache.beam.sdk.transforms.SerializableFunction;
+import org.apache.beam.sdk.transforms.display.DisplayData;
+import org.apache.beam.sdk.transforms.display.HasDisplayData;
+import org.apache.beam.sdk.values.PBegin;
+import org.apache.beam.sdk.values.PCollection;
+import org.apache.beam.sdk.values.PDone;
+import org.influxdb.BatchOptions;
+import org.influxdb.InfluxDB;
+import org.influxdb.InfluxDBFactory;
+import org.influxdb.dto.Query;
+import org.influxdb.dto.QueryResult;
+import org.influxdb.dto.QueryResult.Result;
+import org.influxdb.dto.QueryResult.Series;
+import org.joda.time.DateTime;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+/**
+ * IO to read and write to InfluxDB.
+ *
+ * <h3>Reading from InfluxDB</h3>
+ *
+ * <p>InfluxDBIO {@link #read()} returns a bounded collection of {@code String} as a {@code
+ * PCollection<String>}.
+ *
+ * <p>you have to provide a {@link DataSourceConfiguration} using<br>
+ * {@link DataSourceConfiguration#create(String, String, String)}(url, userName and password).
+ * Optionally, {@link DataSourceConfiguration#withUsername(String)} and {@link
+ * DataSourceConfiguration#withPassword(String)} allows you to define userName and password.
+ *
+ * <p>For example:
+ *
+ * <pre>{@code
+ * PCollection<String> collection = pipeline.apply(InfluxDBIO.read()
+ *   .withDataSourceConfiguration(InfluxDBIO.DataSourceConfiguration.create(
+ *          "https://localhost:8086","userName","password"))
+ *   .withDatabase("metrics")
+ *   .withRetentionPolicy("autogen")
+ *   .withSslInvalidHostNameAllowed(true)
+ *   .withSslEnabled(true));
+ * }</pre>
+ *
+ * <p>Read with query example:
+ *
+ * <pre>{@code
+ * PCollection<String> collection = pipeline.apply(InfluxDBIO.read()
+ *   .withDataSourceConfiguration(InfluxDBIO.DataSourceConfiguration.create(
+ *          "https://localhost:8086","userName","password"))
+ *   .withDatabase("metrics")
+ *   .withQuery("SELECT * FROM CPU")
+ *   .withRetentionPolicy("autogen")
+ *   .withSslInvalidHostNameAllowed(true)
+ *   .withSslEnabled(true));
+ * }</pre>
+ *
+ * <h3>Writing to InfluxDB </h3>
+ *
+ * <p>InfluxDB sink supports writing records into a database. It writes a {@link PCollection} to the
+ * database by converting each T. The T should implement getLineProtocol() from {@link
+ * LineProtocolConvertable}.
+ *
+ * <p>Like the {@link #read()}, to configure the {@link #write()}, you have to provide a {@link
+ * DataSourceConfiguration}.
+ *
+ * <pre>{@code
+ * pipeline
+ *   .apply(...)
+ *   .apply(InfluxDb.write()
+ *      .withDataSourceConfiguration(InfluxDBIO.DataSourceConfiguration.create(
+ *            "https://localhost:8086","userName","password"))
+ *   .withRetentionPolicy("autogen")
+ *   .withDatabase("metrics")
+ *   .withSslInvalidHostNameAllowed(true)
+ *   .withSslEnabled(true));
+ *    );
+ * }</pre>
+ *
+ * *
+ */
+@Experimental(Experimental.Kind.SOURCE_SINK)
+public class InfluxDBIO {
+  private static final Logger LOG = LoggerFactory.getLogger(InfluxDBIO.class);
+
+  public static Write write() {
+    return new AutoValue_InfluxDBIO_Write.Builder()
+        .setSslEnabled(false)
+        .setSslInvalidHostNameAllowed(false)
+        .setFlushDuration(DEFAULT_BATCH_INTERVAL_DURATION)
+        .setNoOfElementsToBatch(DEFAULT_BUFFER_LIMIT)
+        .build();
+  }
+
+  public static Read read() {
+    return new AutoValue_InfluxDBIO_Read.Builder()
+        .setSslEnabled(false)
+        .setSslInvalidHostNameAllowed(false)
+        .setStartDateTime(DateTime.parse("1677-09-21T00:12:43.145224194Z"))
+        .setEndDateTime(DateTime.parse("2262-04-11T23:47:16.854775806Z"))
+        .setRetentionPolicy("autogen")
+        .build();
+  }
+
+  @AutoValue
+  public abstract static class Read extends PTransform<PBegin, PCollection<String>> {
+
+    abstract boolean sslInvalidHostNameAllowed();
+
+    abstract String retentionPolicy();
+
+    @Nullable
+    abstract String database();
+
+    @Nullable
+    abstract String query();
+
+    abstract boolean sslEnabled();
+
+    @Nullable
+    abstract DataSourceConfiguration dataSourceConfiguration();
+
+    @Nullable
+    abstract List<String> metrics();
+
+    abstract DateTime startDateTime();
+
+    abstract DateTime endDateTime();
+
+    @Nullable
+    abstract DateTime fromDateTime();
+
+    @Nullable
+    abstract DateTime toDateTime();
+
+    abstract Builder builder();
+
+    @AutoValue.Builder
+    abstract static class Builder {
+      abstract Builder setDataSourceConfiguration(DataSourceConfiguration configuration);
+
+      abstract Builder setDatabase(String database);
+
+      abstract Builder setSslInvalidHostNameAllowed(boolean value);
+
+      abstract Builder setRetentionPolicy(String retentionPolicy);
+
+      abstract Builder setQuery(String query);
+
+      abstract Builder setToDateTime(DateTime toDateTime);
+
+      abstract Builder setFromDateTime(DateTime fromDateTime);
+
+      abstract Builder setStartDateTime(DateTime startDateTime);
+
+      abstract Builder setEndDateTime(DateTime endDateTime);
+
+      abstract Builder setSslEnabled(boolean sslEnabled);
+
+      abstract Builder setMetrics(List<String> metrics);
+
+      abstract Read build();
+    }
+
+    /** Reads from the InfluxDB instance indicated by the given configuration. */
+    public Read withDataSourceConfiguration(DataSourceConfiguration configuration) {
+      checkArgument(configuration != null, "configuration can not be null");
+      return builder().setDataSourceConfiguration(configuration).build();
+    }
+
+    /** Reads from the specified database. */
+    public Read withDatabase(String database) {
+      return builder()
+          .setDatabase(database)
+          .setDataSourceConfiguration(dataSourceConfiguration())
+          .build();
+    }
+
+    public Read withToDateTime(DateTime toDateTime) {
+      return builder().setToDateTime(toDateTime).build();
+    }
+
+    public Read withFromDateTime(DateTime fromDateTime) {
+      return builder().setFromDateTime(fromDateTime).build();
+    }
+
+    public Read withStartDateTime(DateTime startDateTime) {
+      return builder().setStartDateTime(startDateTime).build();
+    }
+
+    public Read withEndDateTime(DateTime endDateTime) {
+      return builder().setEndDateTime(endDateTime).build();
+    }
+
+    public Read withMetrics(List<String> metrics) {
+      return builder().setMetrics(metrics).build();
+    }
+
+    public Read withMetrics(String... metrics) {
+      return withMetrics(Arrays.asList(metrics));
+    }
+
+    public Read withSslEnabled(boolean sslEnabled) {
+      return builder().setSslEnabled(sslEnabled).build();
+    }
+
+    public Read withSslInvalidHostNameAllowed(boolean value) {
+      return builder().setSslInvalidHostNameAllowed(value).build();
+    }
+
+    public Read withRetentionPolicy(String retentionPolicy) {
+      return builder().setRetentionPolicy(retentionPolicy).build();
+    }
+
+    public Read withQuery(String query) {
+      return builder().setQuery(query).build();
+    }
+
+    @Override
+    public PCollection<String> expand(PBegin input) {
+      checkArgument(dataSourceConfiguration() != null, "configuration is required");
+      checkArgument(query() != null || database() != null, "database or query is required");
+      if (database() != null) {
+        checkArgument(
+            checkDatabase(
+                database(), dataSourceConfiguration(), sslInvalidHostNameAllowed(), sslEnabled()),
+            "Database %s does not exist",
+            database());
+      }
+      return input.apply(org.apache.beam.sdk.io.Read.from(new InfluxDBSource(this)));
+    }
+
+    @Override
+    public void populateDisplayData(DisplayData.Builder builder) {
+      super.populateDisplayData(builder);
+      builder.addIfNotNull(
+          DisplayData.item("dataSourceConfiguration", dataSourceConfiguration().toString()));
+      builder.addIfNotNull(DisplayData.item("database", database()));
+      builder.addIfNotNull(DisplayData.item("retentionPolicy", retentionPolicy()));
+      builder.addIfNotNull(DisplayData.item("sslEnabled", sslEnabled()));
+      builder.addIfNotNull(DisplayData.item("query", query()));
+      builder.addIfNotNull(
+          DisplayData.item("sslInvalidHostNameAllowed", sslInvalidHostNameAllowed()));
+    }
+  }
+
+  static class InfluxDBSource extends BoundedSource<String> {
+    private final Read spec;
+
+    InfluxDBSource(Read read) {
+      this.spec = read;
+    }
+
+    @Override
+    public long getEstimatedSizeBytes(PipelineOptions pipelineOptions) {
+      String noOfBlocks = "NUMBER OF BLOCKS";
+      String sizeOfBlocks = "SIZE OF BLOCKS";
+      LinkedHashSet<Long> noOfBlocksValue = new LinkedHashSet<>();
+      LinkedHashSet<Long> sizeOfBlocksValue = new LinkedHashSet<>();
+      try (InfluxDB connection =
+          getConnection(
+              spec.dataSourceConfiguration(),
+              spec.sslInvalidHostNameAllowed(),
+              spec.sslEnabled())) {
+        String query = spec.query();
+        if (query == null) {
+          query =
+              String.format(
+                  "SELECT * FROM %s.%s", spec.retentionPolicy(), String.join(",", spec.metrics()));
+        }
+        QueryResult result = connection.query(new Query(query, spec.database()));
+        List<Result> results = result.getResults();
+        for (Result res : results) {
+          for (Series series : res.getSeries()) {
+            for (List<Object> data : series.getValues()) {
+              String s = data.get(0).toString();
+              if (s.startsWith(noOfBlocks)) {
+                noOfBlocksValue.add(Long.parseLong(s.split(":", -1)[1].trim()));
+              }
+              if (s.startsWith(sizeOfBlocks)) {
+                sizeOfBlocksValue.add(Long.parseLong(s.split(":", -1)[1].trim()));
+              }
+            }
+          }
+        }
+      }
+
+      Iterator<Long> noOfBlocksValueItr = noOfBlocksValue.iterator();

Review comment:
       nit: numOfBlocksValueIterator

##########
File path: sdks/java/io/influxdb/src/main/java/org/apache/beam/sdk/io/influxdb/InfluxDBIO.java
##########
@@ -0,0 +1,829 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.apache.beam.sdk.io.influxdb;
+
+import static org.apache.beam.vendor.guava.v26_0_jre.com.google.common.base.Preconditions.checkArgument;
+import static org.influxdb.BatchOptions.DEFAULT_BATCH_INTERVAL_DURATION;
+import static org.influxdb.BatchOptions.DEFAULT_BUFFER_LIMIT;
+
+import com.google.auto.value.AutoValue;
+import java.io.Serializable;
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.Collections;
+import java.util.Iterator;
+import java.util.LinkedHashSet;
+import java.util.List;
+import javax.annotation.Nullable;
+import javax.net.ssl.SSLContext;
+import javax.net.ssl.SSLSocketFactory;
+import javax.net.ssl.TrustManager;
+import javax.net.ssl.X509TrustManager;
+import okhttp3.OkHttpClient;
+import org.apache.beam.sdk.annotations.Experimental;
+import org.apache.beam.sdk.coders.Coder;
+import org.apache.beam.sdk.coders.StringUtf8Coder;
+import org.apache.beam.sdk.io.BoundedSource;
+import org.apache.beam.sdk.options.PipelineOptions;
+import org.apache.beam.sdk.options.ValueProvider;
+import org.apache.beam.sdk.transforms.DoFn;
+import org.apache.beam.sdk.transforms.PTransform;
+import org.apache.beam.sdk.transforms.ParDo;
+import org.apache.beam.sdk.transforms.SerializableFunction;
+import org.apache.beam.sdk.transforms.display.DisplayData;
+import org.apache.beam.sdk.transforms.display.HasDisplayData;
+import org.apache.beam.sdk.values.PBegin;
+import org.apache.beam.sdk.values.PCollection;
+import org.apache.beam.sdk.values.PDone;
+import org.influxdb.BatchOptions;
+import org.influxdb.InfluxDB;
+import org.influxdb.InfluxDBFactory;
+import org.influxdb.dto.Query;
+import org.influxdb.dto.QueryResult;
+import org.influxdb.dto.QueryResult.Result;
+import org.influxdb.dto.QueryResult.Series;
+import org.joda.time.DateTime;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+/**
+ * IO to read and write to InfluxDB.
+ *
+ * <h3>Reading from InfluxDB</h3>
+ *
+ * <p>InfluxDBIO {@link #read()} returns a bounded collection of {@code String} as a {@code
+ * PCollection<String>}.
+ *
+ * <p>you have to provide a {@link DataSourceConfiguration} using<br>
+ * {@link DataSourceConfiguration#create(String, String, String)}(url, userName and password).
+ * Optionally, {@link DataSourceConfiguration#withUsername(String)} and {@link
+ * DataSourceConfiguration#withPassword(String)} allows you to define userName and password.
+ *
+ * <p>For example:
+ *
+ * <pre>{@code
+ * PCollection<String> collection = pipeline.apply(InfluxDBIO.read()
+ *   .withDataSourceConfiguration(InfluxDBIO.DataSourceConfiguration.create(
+ *          "https://localhost:8086","userName","password"))
+ *   .withDatabase("metrics")
+ *   .withRetentionPolicy("autogen")
+ *   .withSslInvalidHostNameAllowed(true)
+ *   .withSslEnabled(true));
+ * }</pre>
+ *
+ * <p>Read with query example:
+ *
+ * <pre>{@code
+ * PCollection<String> collection = pipeline.apply(InfluxDBIO.read()
+ *   .withDataSourceConfiguration(InfluxDBIO.DataSourceConfiguration.create(
+ *          "https://localhost:8086","userName","password"))
+ *   .withDatabase("metrics")
+ *   .withQuery("SELECT * FROM CPU")
+ *   .withRetentionPolicy("autogen")
+ *   .withSslInvalidHostNameAllowed(true)
+ *   .withSslEnabled(true));
+ * }</pre>
+ *
+ * <h3>Writing to InfluxDB </h3>
+ *
+ * <p>InfluxDB sink supports writing records into a database. It writes a {@link PCollection} to the
+ * database by converting each T. The T should implement getLineProtocol() from {@link
+ * LineProtocolConvertable}.
+ *
+ * <p>Like the {@link #read()}, to configure the {@link #write()}, you have to provide a {@link
+ * DataSourceConfiguration}.
+ *
+ * <pre>{@code
+ * pipeline
+ *   .apply(...)
+ *   .apply(InfluxDb.write()
+ *      .withDataSourceConfiguration(InfluxDBIO.DataSourceConfiguration.create(
+ *            "https://localhost:8086","userName","password"))
+ *   .withRetentionPolicy("autogen")
+ *   .withDatabase("metrics")
+ *   .withSslInvalidHostNameAllowed(true)
+ *   .withSslEnabled(true));
+ *    );
+ * }</pre>
+ *
+ * *
+ */
+@Experimental(Experimental.Kind.SOURCE_SINK)
+public class InfluxDBIO {
+  private static final Logger LOG = LoggerFactory.getLogger(InfluxDBIO.class);
+
+  public static Write write() {
+    return new AutoValue_InfluxDBIO_Write.Builder()
+        .setSslEnabled(false)
+        .setSslInvalidHostNameAllowed(false)
+        .setFlushDuration(DEFAULT_BATCH_INTERVAL_DURATION)
+        .setNoOfElementsToBatch(DEFAULT_BUFFER_LIMIT)
+        .build();
+  }
+
+  public static Read read() {
+    return new AutoValue_InfluxDBIO_Read.Builder()
+        .setSslEnabled(false)
+        .setSslInvalidHostNameAllowed(false)
+        .setStartDateTime(DateTime.parse("1677-09-21T00:12:43.145224194Z"))
+        .setEndDateTime(DateTime.parse("2262-04-11T23:47:16.854775806Z"))
+        .setRetentionPolicy("autogen")
+        .build();
+  }
+
+  @AutoValue
+  public abstract static class Read extends PTransform<PBegin, PCollection<String>> {
+
+    abstract boolean sslInvalidHostNameAllowed();
+
+    abstract String retentionPolicy();
+
+    @Nullable
+    abstract String database();
+
+    @Nullable
+    abstract String query();
+
+    abstract boolean sslEnabled();
+
+    @Nullable
+    abstract DataSourceConfiguration dataSourceConfiguration();
+
+    @Nullable
+    abstract List<String> metrics();
+
+    abstract DateTime startDateTime();
+
+    abstract DateTime endDateTime();
+
+    @Nullable
+    abstract DateTime fromDateTime();
+
+    @Nullable
+    abstract DateTime toDateTime();
+
+    abstract Builder builder();
+
+    @AutoValue.Builder
+    abstract static class Builder {
+      abstract Builder setDataSourceConfiguration(DataSourceConfiguration configuration);
+
+      abstract Builder setDatabase(String database);
+
+      abstract Builder setSslInvalidHostNameAllowed(boolean value);
+
+      abstract Builder setRetentionPolicy(String retentionPolicy);
+
+      abstract Builder setQuery(String query);
+
+      abstract Builder setToDateTime(DateTime toDateTime);
+
+      abstract Builder setFromDateTime(DateTime fromDateTime);
+
+      abstract Builder setStartDateTime(DateTime startDateTime);
+
+      abstract Builder setEndDateTime(DateTime endDateTime);
+
+      abstract Builder setSslEnabled(boolean sslEnabled);
+
+      abstract Builder setMetrics(List<String> metrics);
+
+      abstract Read build();
+    }
+
+    /** Reads from the InfluxDB instance indicated by the given configuration. */
+    public Read withDataSourceConfiguration(DataSourceConfiguration configuration) {
+      checkArgument(configuration != null, "configuration can not be null");
+      return builder().setDataSourceConfiguration(configuration).build();
+    }
+
+    /** Reads from the specified database. */
+    public Read withDatabase(String database) {
+      return builder()
+          .setDatabase(database)
+          .setDataSourceConfiguration(dataSourceConfiguration())
+          .build();
+    }
+
+    public Read withToDateTime(DateTime toDateTime) {
+      return builder().setToDateTime(toDateTime).build();
+    }
+
+    public Read withFromDateTime(DateTime fromDateTime) {
+      return builder().setFromDateTime(fromDateTime).build();
+    }
+
+    public Read withStartDateTime(DateTime startDateTime) {
+      return builder().setStartDateTime(startDateTime).build();
+    }
+
+    public Read withEndDateTime(DateTime endDateTime) {
+      return builder().setEndDateTime(endDateTime).build();
+    }
+
+    public Read withMetrics(List<String> metrics) {
+      return builder().setMetrics(metrics).build();
+    }
+
+    public Read withMetrics(String... metrics) {
+      return withMetrics(Arrays.asList(metrics));
+    }
+
+    public Read withSslEnabled(boolean sslEnabled) {
+      return builder().setSslEnabled(sslEnabled).build();
+    }
+
+    public Read withSslInvalidHostNameAllowed(boolean value) {

Review comment:
       What is a case when user would need to set it to `true`? It could be potential security issue.

##########
File path: sdks/java/io/influxdb/src/main/java/org/apache/beam/sdk/io/influxdb/InfluxDBIO.java
##########
@@ -0,0 +1,829 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.apache.beam.sdk.io.influxdb;
+
+import static org.apache.beam.vendor.guava.v26_0_jre.com.google.common.base.Preconditions.checkArgument;
+import static org.influxdb.BatchOptions.DEFAULT_BATCH_INTERVAL_DURATION;
+import static org.influxdb.BatchOptions.DEFAULT_BUFFER_LIMIT;
+
+import com.google.auto.value.AutoValue;
+import java.io.Serializable;
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.Collections;
+import java.util.Iterator;
+import java.util.LinkedHashSet;
+import java.util.List;
+import javax.annotation.Nullable;
+import javax.net.ssl.SSLContext;
+import javax.net.ssl.SSLSocketFactory;
+import javax.net.ssl.TrustManager;
+import javax.net.ssl.X509TrustManager;
+import okhttp3.OkHttpClient;
+import org.apache.beam.sdk.annotations.Experimental;
+import org.apache.beam.sdk.coders.Coder;
+import org.apache.beam.sdk.coders.StringUtf8Coder;
+import org.apache.beam.sdk.io.BoundedSource;
+import org.apache.beam.sdk.options.PipelineOptions;
+import org.apache.beam.sdk.options.ValueProvider;
+import org.apache.beam.sdk.transforms.DoFn;
+import org.apache.beam.sdk.transforms.PTransform;
+import org.apache.beam.sdk.transforms.ParDo;
+import org.apache.beam.sdk.transforms.SerializableFunction;
+import org.apache.beam.sdk.transforms.display.DisplayData;
+import org.apache.beam.sdk.transforms.display.HasDisplayData;
+import org.apache.beam.sdk.values.PBegin;
+import org.apache.beam.sdk.values.PCollection;
+import org.apache.beam.sdk.values.PDone;
+import org.influxdb.BatchOptions;
+import org.influxdb.InfluxDB;
+import org.influxdb.InfluxDBFactory;
+import org.influxdb.dto.Query;
+import org.influxdb.dto.QueryResult;
+import org.influxdb.dto.QueryResult.Result;
+import org.influxdb.dto.QueryResult.Series;
+import org.joda.time.DateTime;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+/**
+ * IO to read and write to InfluxDB.
+ *
+ * <h3>Reading from InfluxDB</h3>
+ *
+ * <p>InfluxDBIO {@link #read()} returns a bounded collection of {@code String} as a {@code
+ * PCollection<String>}.
+ *
+ * <p>you have to provide a {@link DataSourceConfiguration} using<br>
+ * {@link DataSourceConfiguration#create(String, String, String)}(url, userName and password).
+ * Optionally, {@link DataSourceConfiguration#withUsername(String)} and {@link
+ * DataSourceConfiguration#withPassword(String)} allows you to define userName and password.
+ *
+ * <p>For example:
+ *
+ * <pre>{@code
+ * PCollection<String> collection = pipeline.apply(InfluxDBIO.read()
+ *   .withDataSourceConfiguration(InfluxDBIO.DataSourceConfiguration.create(
+ *          "https://localhost:8086","userName","password"))
+ *   .withDatabase("metrics")
+ *   .withRetentionPolicy("autogen")
+ *   .withSslInvalidHostNameAllowed(true)
+ *   .withSslEnabled(true));
+ * }</pre>
+ *
+ * <p>Read with query example:
+ *
+ * <pre>{@code
+ * PCollection<String> collection = pipeline.apply(InfluxDBIO.read()
+ *   .withDataSourceConfiguration(InfluxDBIO.DataSourceConfiguration.create(
+ *          "https://localhost:8086","userName","password"))
+ *   .withDatabase("metrics")
+ *   .withQuery("SELECT * FROM CPU")
+ *   .withRetentionPolicy("autogen")
+ *   .withSslInvalidHostNameAllowed(true)
+ *   .withSslEnabled(true));
+ * }</pre>
+ *
+ * <h3>Writing to InfluxDB </h3>
+ *
+ * <p>InfluxDB sink supports writing records into a database. It writes a {@link PCollection} to the
+ * database by converting each T. The T should implement getLineProtocol() from {@link
+ * LineProtocolConvertable}.
+ *
+ * <p>Like the {@link #read()}, to configure the {@link #write()}, you have to provide a {@link
+ * DataSourceConfiguration}.
+ *
+ * <pre>{@code
+ * pipeline
+ *   .apply(...)
+ *   .apply(InfluxDb.write()
+ *      .withDataSourceConfiguration(InfluxDBIO.DataSourceConfiguration.create(
+ *            "https://localhost:8086","userName","password"))
+ *   .withRetentionPolicy("autogen")
+ *   .withDatabase("metrics")
+ *   .withSslInvalidHostNameAllowed(true)
+ *   .withSslEnabled(true));
+ *    );
+ * }</pre>
+ *
+ * *
+ */
+@Experimental(Experimental.Kind.SOURCE_SINK)
+public class InfluxDBIO {
+  private static final Logger LOG = LoggerFactory.getLogger(InfluxDBIO.class);
+
+  public static Write write() {
+    return new AutoValue_InfluxDBIO_Write.Builder()
+        .setSslEnabled(false)
+        .setSslInvalidHostNameAllowed(false)
+        .setFlushDuration(DEFAULT_BATCH_INTERVAL_DURATION)
+        .setNoOfElementsToBatch(DEFAULT_BUFFER_LIMIT)
+        .build();
+  }
+
+  public static Read read() {
+    return new AutoValue_InfluxDBIO_Read.Builder()
+        .setSslEnabled(false)
+        .setSslInvalidHostNameAllowed(false)
+        .setStartDateTime(DateTime.parse("1677-09-21T00:12:43.145224194Z"))
+        .setEndDateTime(DateTime.parse("2262-04-11T23:47:16.854775806Z"))
+        .setRetentionPolicy("autogen")
+        .build();
+  }
+
+  @AutoValue
+  public abstract static class Read extends PTransform<PBegin, PCollection<String>> {
+
+    abstract boolean sslInvalidHostNameAllowed();
+
+    abstract String retentionPolicy();
+
+    @Nullable
+    abstract String database();
+
+    @Nullable
+    abstract String query();
+
+    abstract boolean sslEnabled();
+
+    @Nullable
+    abstract DataSourceConfiguration dataSourceConfiguration();
+
+    @Nullable
+    abstract List<String> metrics();
+
+    abstract DateTime startDateTime();
+
+    abstract DateTime endDateTime();
+
+    @Nullable
+    abstract DateTime fromDateTime();
+
+    @Nullable
+    abstract DateTime toDateTime();
+
+    abstract Builder builder();
+
+    @AutoValue.Builder
+    abstract static class Builder {
+      abstract Builder setDataSourceConfiguration(DataSourceConfiguration configuration);
+
+      abstract Builder setDatabase(String database);
+
+      abstract Builder setSslInvalidHostNameAllowed(boolean value);
+
+      abstract Builder setRetentionPolicy(String retentionPolicy);
+
+      abstract Builder setQuery(String query);
+
+      abstract Builder setToDateTime(DateTime toDateTime);
+
+      abstract Builder setFromDateTime(DateTime fromDateTime);
+
+      abstract Builder setStartDateTime(DateTime startDateTime);
+
+      abstract Builder setEndDateTime(DateTime endDateTime);
+
+      abstract Builder setSslEnabled(boolean sslEnabled);
+
+      abstract Builder setMetrics(List<String> metrics);
+
+      abstract Read build();
+    }
+
+    /** Reads from the InfluxDB instance indicated by the given configuration. */
+    public Read withDataSourceConfiguration(DataSourceConfiguration configuration) {
+      checkArgument(configuration != null, "configuration can not be null");
+      return builder().setDataSourceConfiguration(configuration).build();
+    }
+
+    /** Reads from the specified database. */
+    public Read withDatabase(String database) {
+      return builder()
+          .setDatabase(database)
+          .setDataSourceConfiguration(dataSourceConfiguration())
+          .build();
+    }
+
+    public Read withToDateTime(DateTime toDateTime) {
+      return builder().setToDateTime(toDateTime).build();
+    }
+
+    public Read withFromDateTime(DateTime fromDateTime) {
+      return builder().setFromDateTime(fromDateTime).build();
+    }
+
+    public Read withStartDateTime(DateTime startDateTime) {
+      return builder().setStartDateTime(startDateTime).build();
+    }
+
+    public Read withEndDateTime(DateTime endDateTime) {
+      return builder().setEndDateTime(endDateTime).build();
+    }
+
+    public Read withMetrics(List<String> metrics) {
+      return builder().setMetrics(metrics).build();
+    }
+
+    public Read withMetrics(String... metrics) {
+      return withMetrics(Arrays.asList(metrics));
+    }
+
+    public Read withSslEnabled(boolean sslEnabled) {
+      return builder().setSslEnabled(sslEnabled).build();
+    }
+
+    public Read withSslInvalidHostNameAllowed(boolean value) {
+      return builder().setSslInvalidHostNameAllowed(value).build();
+    }
+
+    public Read withRetentionPolicy(String retentionPolicy) {
+      return builder().setRetentionPolicy(retentionPolicy).build();
+    }
+
+    public Read withQuery(String query) {
+      return builder().setQuery(query).build();
+    }
+
+    @Override
+    public PCollection<String> expand(PBegin input) {
+      checkArgument(dataSourceConfiguration() != null, "configuration is required");
+      checkArgument(query() != null || database() != null, "database or query is required");
+      if (database() != null) {
+        checkArgument(
+            checkDatabase(
+                database(), dataSourceConfiguration(), sslInvalidHostNameAllowed(), sslEnabled()),
+            "Database %s does not exist",
+            database());
+      }
+      return input.apply(org.apache.beam.sdk.io.Read.from(new InfluxDBSource(this)));
+    }
+
+    @Override
+    public void populateDisplayData(DisplayData.Builder builder) {
+      super.populateDisplayData(builder);
+      builder.addIfNotNull(
+          DisplayData.item("dataSourceConfiguration", dataSourceConfiguration().toString()));
+      builder.addIfNotNull(DisplayData.item("database", database()));
+      builder.addIfNotNull(DisplayData.item("retentionPolicy", retentionPolicy()));
+      builder.addIfNotNull(DisplayData.item("sslEnabled", sslEnabled()));
+      builder.addIfNotNull(DisplayData.item("query", query()));
+      builder.addIfNotNull(
+          DisplayData.item("sslInvalidHostNameAllowed", sslInvalidHostNameAllowed()));
+    }
+  }
+
+  static class InfluxDBSource extends BoundedSource<String> {
+    private final Read spec;
+
+    InfluxDBSource(Read read) {
+      this.spec = read;
+    }
+
+    @Override
+    public long getEstimatedSizeBytes(PipelineOptions pipelineOptions) {
+      String noOfBlocks = "NUMBER OF BLOCKS";
+      String sizeOfBlocks = "SIZE OF BLOCKS";
+      LinkedHashSet<Long> noOfBlocksValue = new LinkedHashSet<>();
+      LinkedHashSet<Long> sizeOfBlocksValue = new LinkedHashSet<>();
+      try (InfluxDB connection =
+          getConnection(
+              spec.dataSourceConfiguration(),
+              spec.sslInvalidHostNameAllowed(),
+              spec.sslEnabled())) {
+        String query = spec.query();
+        if (query == null) {
+          query =
+              String.format(
+                  "SELECT * FROM %s.%s", spec.retentionPolicy(), String.join(",", spec.metrics()));
+        }
+        QueryResult result = connection.query(new Query(query, spec.database()));
+        List<Result> results = result.getResults();
+        for (Result res : results) {
+          for (Series series : res.getSeries()) {
+            for (List<Object> data : series.getValues()) {
+              String s = data.get(0).toString();
+              if (s.startsWith(noOfBlocks)) {
+                noOfBlocksValue.add(Long.parseLong(s.split(":", -1)[1].trim()));
+              }
+              if (s.startsWith(sizeOfBlocks)) {
+                sizeOfBlocksValue.add(Long.parseLong(s.split(":", -1)[1].trim()));
+              }
+            }
+          }
+        }
+      }
+
+      Iterator<Long> noOfBlocksValueItr = noOfBlocksValue.iterator();
+      Iterator<Long> sizeOfBlocksValueItr = sizeOfBlocksValue.iterator();
+      long size = 0;
+      while (noOfBlocksValueItr.hasNext() && sizeOfBlocksValueItr.hasNext()) {
+        size = size + (noOfBlocksValueItr.next() * sizeOfBlocksValueItr.next());
+      }
+      return size;
+    }
+
+    @Override
+    public List<? extends BoundedSource<String>> split(
+        long desiredElementsInABundle, PipelineOptions options) {
+      List<ShardInformation> shardInfo =
+          getDBShardedInformation(
+              spec.database(),
+              spec.dataSourceConfiguration(),
+              spec.sslInvalidHostNameAllowed(),
+              spec.sslEnabled());
+      List<BoundedSource<String>> sources = new ArrayList<>();
+      if (spec.query() == null) {
+        for (ShardInformation sInfo : shardInfo) {
+          if (sInfo.getStartTime().compareTo(spec.startDateTime()) > 0) {
+            sources.add(
+                new InfluxDBSource(
+                    spec.withMetrics(spec.metrics())
+                        .withRetentionPolicy(sInfo.getRetentionPolicy())
+                        .withToDateTime(sInfo.getStartTime())
+                        .withFromDateTime(sInfo.getEndTime())));
+          }
+        }
+      } else {
+        sources.add(this);
+      }
+      return sources;
+    }
+
+    @Override
+    public BoundedReader<String> createReader(PipelineOptions pipelineOptions) {
+      return new BoundedInfluxDbReader(this);
+    }
+
+    @Override
+    public void validate() {
+      spec.validate(null /* input */);
+    }
+
+    @Override
+    public void populateDisplayData(DisplayData.Builder builder) {
+      spec.populateDisplayData(builder);
+    }
+
+    @Override
+    public Coder<String> getOutputCoder() {
+      return StringUtf8Coder.of();
+    }
+  }
+
+  private static String getQueryToRun(Read spec) {
+    if (spec.query() == null) {
+      if (spec.toDateTime() != null && spec.fromDateTime() != null) {
+        return String.format(
+            "SELECT * FROM %s.%s WHERE time >= '%s' and time <= '%s'",
+            spec.retentionPolicy(),
+            String.join(",", spec.metrics()),
+            spec.toDateTime(),
+            spec.fromDateTime());
+      } else {
+        return String.format(
+            "SELECT * FROM %s.%s", spec.retentionPolicy(), String.join(",", spec.metrics()));
+      }
+    }
+    return spec.query();
+  }
+
+  private static class BoundedInfluxDbReader extends BoundedSource.BoundedReader<String> {
+    private final InfluxDBIO.InfluxDBSource source;
+    private Iterator<Result> resultIterator;
+    private Iterator<Series> seriesIterator;
+    private Iterator<List<Object>> valuesIterator;
+    private List current;
+
+    public BoundedInfluxDbReader(InfluxDBIO.InfluxDBSource source) {
+      this.source = source;
+    }
+
+    @Override
+    public boolean start() {
+      InfluxDBIO.Read spec = source.spec;
+      try (InfluxDB influxDB =
+          getConnection(
+              spec.dataSourceConfiguration(),
+              spec.sslInvalidHostNameAllowed(),
+              spec.sslEnabled())) {
+        if (spec.database() != null) {
+          influxDB.setDatabase(spec.database());
+        }
+        if (spec.retentionPolicy() != null) {
+          influxDB.setRetentionPolicy(spec.retentionPolicy());
+        }
+        String query = getQueryToRun(spec);
+        QueryResult queryResult = influxDB.query(new Query(query, spec.database()));
+        resultIterator = queryResult.getResults().iterator();
+        if (resultIterator.hasNext()) {
+          seriesIterator = resultIterator.next().getSeries().iterator();
+        }
+        if (seriesIterator.hasNext()) {
+          valuesIterator = seriesIterator.next().getValues().iterator();
+        }
+      }
+      return advance();
+    }
+
+    @Override
+    public boolean advance() {
+      if (valuesIterator.hasNext()) {
+        current = valuesIterator.next();
+        return true;
+      } else if (seriesIterator.hasNext()) {
+        valuesIterator = seriesIterator.next().getValues().iterator();
+        current = valuesIterator.next();
+        return true;
+      } else if (resultIterator.hasNext()) {
+        seriesIterator = resultIterator.next().getSeries().iterator();
+        valuesIterator = seriesIterator.next().getValues().iterator();
+        current = valuesIterator.next();
+        return true;
+      } else {
+        return false;
+      }
+    }
+
+    @Override
+    public BoundedSource getCurrentSource() {
+      return source;
+    }
+
+    @Override
+    public String getCurrent() {
+      return current.toString();
+    }
+
+    @Override
+    public void close() {}
+  }
+
+  @AutoValue
+  public abstract static class Write extends PTransform<PCollection<String>, PDone> {

Review comment:
       Would it make sense to take as input a PCollection of `LineProtocolConvertable` (instead of just String) or create own wrapper class, something like `InfluxDbRecord implements LineProtocolConvertable`?

##########
File path: sdks/java/io/influxdb/src/main/java/org/apache/beam/sdk/io/influxdb/InfluxDBIO.java
##########
@@ -0,0 +1,829 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.apache.beam.sdk.io.influxdb;
+
+import static org.apache.beam.vendor.guava.v26_0_jre.com.google.common.base.Preconditions.checkArgument;
+import static org.influxdb.BatchOptions.DEFAULT_BATCH_INTERVAL_DURATION;
+import static org.influxdb.BatchOptions.DEFAULT_BUFFER_LIMIT;
+
+import com.google.auto.value.AutoValue;
+import java.io.Serializable;
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.Collections;
+import java.util.Iterator;
+import java.util.LinkedHashSet;
+import java.util.List;
+import javax.annotation.Nullable;
+import javax.net.ssl.SSLContext;
+import javax.net.ssl.SSLSocketFactory;
+import javax.net.ssl.TrustManager;
+import javax.net.ssl.X509TrustManager;
+import okhttp3.OkHttpClient;
+import org.apache.beam.sdk.annotations.Experimental;
+import org.apache.beam.sdk.coders.Coder;
+import org.apache.beam.sdk.coders.StringUtf8Coder;
+import org.apache.beam.sdk.io.BoundedSource;
+import org.apache.beam.sdk.options.PipelineOptions;
+import org.apache.beam.sdk.options.ValueProvider;
+import org.apache.beam.sdk.transforms.DoFn;
+import org.apache.beam.sdk.transforms.PTransform;
+import org.apache.beam.sdk.transforms.ParDo;
+import org.apache.beam.sdk.transforms.SerializableFunction;
+import org.apache.beam.sdk.transforms.display.DisplayData;
+import org.apache.beam.sdk.transforms.display.HasDisplayData;
+import org.apache.beam.sdk.values.PBegin;
+import org.apache.beam.sdk.values.PCollection;
+import org.apache.beam.sdk.values.PDone;
+import org.influxdb.BatchOptions;
+import org.influxdb.InfluxDB;
+import org.influxdb.InfluxDBFactory;
+import org.influxdb.dto.Query;
+import org.influxdb.dto.QueryResult;
+import org.influxdb.dto.QueryResult.Result;
+import org.influxdb.dto.QueryResult.Series;
+import org.joda.time.DateTime;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+/**
+ * IO to read and write to InfluxDB.
+ *
+ * <h3>Reading from InfluxDB</h3>
+ *
+ * <p>InfluxDBIO {@link #read()} returns a bounded collection of {@code String} as a {@code
+ * PCollection<String>}.
+ *
+ * <p>you have to provide a {@link DataSourceConfiguration} using<br>
+ * {@link DataSourceConfiguration#create(String, String, String)}(url, userName and password).
+ * Optionally, {@link DataSourceConfiguration#withUsername(String)} and {@link
+ * DataSourceConfiguration#withPassword(String)} allows you to define userName and password.
+ *
+ * <p>For example:
+ *
+ * <pre>{@code
+ * PCollection<String> collection = pipeline.apply(InfluxDBIO.read()
+ *   .withDataSourceConfiguration(InfluxDBIO.DataSourceConfiguration.create(
+ *          "https://localhost:8086","userName","password"))
+ *   .withDatabase("metrics")
+ *   .withRetentionPolicy("autogen")
+ *   .withSslInvalidHostNameAllowed(true)
+ *   .withSslEnabled(true));
+ * }</pre>
+ *
+ * <p>Read with query example:
+ *
+ * <pre>{@code
+ * PCollection<String> collection = pipeline.apply(InfluxDBIO.read()
+ *   .withDataSourceConfiguration(InfluxDBIO.DataSourceConfiguration.create(
+ *          "https://localhost:8086","userName","password"))
+ *   .withDatabase("metrics")
+ *   .withQuery("SELECT * FROM CPU")
+ *   .withRetentionPolicy("autogen")
+ *   .withSslInvalidHostNameAllowed(true)
+ *   .withSslEnabled(true));
+ * }</pre>
+ *
+ * <h3>Writing to InfluxDB </h3>
+ *
+ * <p>InfluxDB sink supports writing records into a database. It writes a {@link PCollection} to the
+ * database by converting each T. The T should implement getLineProtocol() from {@link
+ * LineProtocolConvertable}.
+ *
+ * <p>Like the {@link #read()}, to configure the {@link #write()}, you have to provide a {@link
+ * DataSourceConfiguration}.
+ *
+ * <pre>{@code
+ * pipeline
+ *   .apply(...)
+ *   .apply(InfluxDb.write()
+ *      .withDataSourceConfiguration(InfluxDBIO.DataSourceConfiguration.create(
+ *            "https://localhost:8086","userName","password"))
+ *   .withRetentionPolicy("autogen")
+ *   .withDatabase("metrics")
+ *   .withSslInvalidHostNameAllowed(true)
+ *   .withSslEnabled(true));
+ *    );
+ * }</pre>
+ *
+ * *
+ */
+@Experimental(Experimental.Kind.SOURCE_SINK)
+public class InfluxDBIO {
+  private static final Logger LOG = LoggerFactory.getLogger(InfluxDBIO.class);
+
+  public static Write write() {
+    return new AutoValue_InfluxDBIO_Write.Builder()
+        .setSslEnabled(false)
+        .setSslInvalidHostNameAllowed(false)
+        .setFlushDuration(DEFAULT_BATCH_INTERVAL_DURATION)
+        .setNoOfElementsToBatch(DEFAULT_BUFFER_LIMIT)
+        .build();
+  }
+
+  public static Read read() {
+    return new AutoValue_InfluxDBIO_Read.Builder()
+        .setSslEnabled(false)
+        .setSslInvalidHostNameAllowed(false)
+        .setStartDateTime(DateTime.parse("1677-09-21T00:12:43.145224194Z"))
+        .setEndDateTime(DateTime.parse("2262-04-11T23:47:16.854775806Z"))
+        .setRetentionPolicy("autogen")
+        .build();
+  }
+
+  @AutoValue
+  public abstract static class Read extends PTransform<PBegin, PCollection<String>> {
+
+    abstract boolean sslInvalidHostNameAllowed();
+
+    abstract String retentionPolicy();
+
+    @Nullable
+    abstract String database();
+
+    @Nullable
+    abstract String query();
+
+    abstract boolean sslEnabled();
+
+    @Nullable
+    abstract DataSourceConfiguration dataSourceConfiguration();
+
+    @Nullable
+    abstract List<String> metrics();
+
+    abstract DateTime startDateTime();
+
+    abstract DateTime endDateTime();
+
+    @Nullable
+    abstract DateTime fromDateTime();
+
+    @Nullable
+    abstract DateTime toDateTime();
+
+    abstract Builder builder();
+
+    @AutoValue.Builder
+    abstract static class Builder {
+      abstract Builder setDataSourceConfiguration(DataSourceConfiguration configuration);
+
+      abstract Builder setDatabase(String database);
+
+      abstract Builder setSslInvalidHostNameAllowed(boolean value);
+
+      abstract Builder setRetentionPolicy(String retentionPolicy);
+
+      abstract Builder setQuery(String query);
+
+      abstract Builder setToDateTime(DateTime toDateTime);
+
+      abstract Builder setFromDateTime(DateTime fromDateTime);
+
+      abstract Builder setStartDateTime(DateTime startDateTime);
+
+      abstract Builder setEndDateTime(DateTime endDateTime);
+
+      abstract Builder setSslEnabled(boolean sslEnabled);
+
+      abstract Builder setMetrics(List<String> metrics);
+
+      abstract Read build();
+    }
+
+    /** Reads from the InfluxDB instance indicated by the given configuration. */
+    public Read withDataSourceConfiguration(DataSourceConfiguration configuration) {
+      checkArgument(configuration != null, "configuration can not be null");
+      return builder().setDataSourceConfiguration(configuration).build();
+    }
+
+    /** Reads from the specified database. */
+    public Read withDatabase(String database) {
+      return builder()
+          .setDatabase(database)
+          .setDataSourceConfiguration(dataSourceConfiguration())
+          .build();
+    }
+
+    public Read withToDateTime(DateTime toDateTime) {
+      return builder().setToDateTime(toDateTime).build();
+    }
+
+    public Read withFromDateTime(DateTime fromDateTime) {
+      return builder().setFromDateTime(fromDateTime).build();
+    }
+
+    public Read withStartDateTime(DateTime startDateTime) {
+      return builder().setStartDateTime(startDateTime).build();
+    }
+
+    public Read withEndDateTime(DateTime endDateTime) {
+      return builder().setEndDateTime(endDateTime).build();
+    }
+
+    public Read withMetrics(List<String> metrics) {
+      return builder().setMetrics(metrics).build();
+    }
+
+    public Read withMetrics(String... metrics) {
+      return withMetrics(Arrays.asList(metrics));
+    }
+
+    public Read withSslEnabled(boolean sslEnabled) {
+      return builder().setSslEnabled(sslEnabled).build();
+    }
+
+    public Read withSslInvalidHostNameAllowed(boolean value) {
+      return builder().setSslInvalidHostNameAllowed(value).build();
+    }
+
+    public Read withRetentionPolicy(String retentionPolicy) {
+      return builder().setRetentionPolicy(retentionPolicy).build();
+    }
+
+    public Read withQuery(String query) {
+      return builder().setQuery(query).build();
+    }
+
+    @Override
+    public PCollection<String> expand(PBegin input) {
+      checkArgument(dataSourceConfiguration() != null, "configuration is required");
+      checkArgument(query() != null || database() != null, "database or query is required");
+      if (database() != null) {
+        checkArgument(

Review comment:
       nit: `checkState`

##########
File path: sdks/java/io/influxdb/src/main/java/org/apache/beam/sdk/io/influxdb/InfluxDBIO.java
##########
@@ -0,0 +1,829 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.apache.beam.sdk.io.influxdb;
+
+import static org.apache.beam.vendor.guava.v26_0_jre.com.google.common.base.Preconditions.checkArgument;
+import static org.influxdb.BatchOptions.DEFAULT_BATCH_INTERVAL_DURATION;
+import static org.influxdb.BatchOptions.DEFAULT_BUFFER_LIMIT;
+
+import com.google.auto.value.AutoValue;
+import java.io.Serializable;
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.Collections;
+import java.util.Iterator;
+import java.util.LinkedHashSet;
+import java.util.List;
+import javax.annotation.Nullable;
+import javax.net.ssl.SSLContext;
+import javax.net.ssl.SSLSocketFactory;
+import javax.net.ssl.TrustManager;
+import javax.net.ssl.X509TrustManager;
+import okhttp3.OkHttpClient;
+import org.apache.beam.sdk.annotations.Experimental;
+import org.apache.beam.sdk.coders.Coder;
+import org.apache.beam.sdk.coders.StringUtf8Coder;
+import org.apache.beam.sdk.io.BoundedSource;
+import org.apache.beam.sdk.options.PipelineOptions;
+import org.apache.beam.sdk.options.ValueProvider;
+import org.apache.beam.sdk.transforms.DoFn;
+import org.apache.beam.sdk.transforms.PTransform;
+import org.apache.beam.sdk.transforms.ParDo;
+import org.apache.beam.sdk.transforms.SerializableFunction;
+import org.apache.beam.sdk.transforms.display.DisplayData;
+import org.apache.beam.sdk.transforms.display.HasDisplayData;
+import org.apache.beam.sdk.values.PBegin;
+import org.apache.beam.sdk.values.PCollection;
+import org.apache.beam.sdk.values.PDone;
+import org.influxdb.BatchOptions;
+import org.influxdb.InfluxDB;
+import org.influxdb.InfluxDBFactory;
+import org.influxdb.dto.Query;
+import org.influxdb.dto.QueryResult;
+import org.influxdb.dto.QueryResult.Result;
+import org.influxdb.dto.QueryResult.Series;
+import org.joda.time.DateTime;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+/**
+ * IO to read and write to InfluxDB.
+ *
+ * <h3>Reading from InfluxDB</h3>
+ *
+ * <p>InfluxDBIO {@link #read()} returns a bounded collection of {@code String} as a {@code
+ * PCollection<String>}.
+ *
+ * <p>you have to provide a {@link DataSourceConfiguration} using<br>
+ * {@link DataSourceConfiguration#create(String, String, String)}(url, userName and password).
+ * Optionally, {@link DataSourceConfiguration#withUsername(String)} and {@link
+ * DataSourceConfiguration#withPassword(String)} allows you to define userName and password.
+ *
+ * <p>For example:
+ *
+ * <pre>{@code
+ * PCollection<String> collection = pipeline.apply(InfluxDBIO.read()
+ *   .withDataSourceConfiguration(InfluxDBIO.DataSourceConfiguration.create(
+ *          "https://localhost:8086","userName","password"))
+ *   .withDatabase("metrics")
+ *   .withRetentionPolicy("autogen")
+ *   .withSslInvalidHostNameAllowed(true)
+ *   .withSslEnabled(true));
+ * }</pre>
+ *
+ * <p>Read with query example:
+ *
+ * <pre>{@code
+ * PCollection<String> collection = pipeline.apply(InfluxDBIO.read()
+ *   .withDataSourceConfiguration(InfluxDBIO.DataSourceConfiguration.create(
+ *          "https://localhost:8086","userName","password"))
+ *   .withDatabase("metrics")
+ *   .withQuery("SELECT * FROM CPU")
+ *   .withRetentionPolicy("autogen")
+ *   .withSslInvalidHostNameAllowed(true)
+ *   .withSslEnabled(true));
+ * }</pre>
+ *
+ * <h3>Writing to InfluxDB </h3>
+ *
+ * <p>InfluxDB sink supports writing records into a database. It writes a {@link PCollection} to the
+ * database by converting each T. The T should implement getLineProtocol() from {@link
+ * LineProtocolConvertable}.
+ *
+ * <p>Like the {@link #read()}, to configure the {@link #write()}, you have to provide a {@link
+ * DataSourceConfiguration}.
+ *
+ * <pre>{@code
+ * pipeline
+ *   .apply(...)
+ *   .apply(InfluxDb.write()
+ *      .withDataSourceConfiguration(InfluxDBIO.DataSourceConfiguration.create(
+ *            "https://localhost:8086","userName","password"))
+ *   .withRetentionPolicy("autogen")
+ *   .withDatabase("metrics")
+ *   .withSslInvalidHostNameAllowed(true)
+ *   .withSslEnabled(true));
+ *    );
+ * }</pre>
+ *
+ * *
+ */
+@Experimental(Experimental.Kind.SOURCE_SINK)
+public class InfluxDBIO {
+  private static final Logger LOG = LoggerFactory.getLogger(InfluxDBIO.class);
+
+  public static Write write() {
+    return new AutoValue_InfluxDBIO_Write.Builder()
+        .setSslEnabled(false)
+        .setSslInvalidHostNameAllowed(false)
+        .setFlushDuration(DEFAULT_BATCH_INTERVAL_DURATION)
+        .setNoOfElementsToBatch(DEFAULT_BUFFER_LIMIT)
+        .build();
+  }
+
+  public static Read read() {
+    return new AutoValue_InfluxDBIO_Read.Builder()
+        .setSslEnabled(false)
+        .setSslInvalidHostNameAllowed(false)
+        .setStartDateTime(DateTime.parse("1677-09-21T00:12:43.145224194Z"))
+        .setEndDateTime(DateTime.parse("2262-04-11T23:47:16.854775806Z"))
+        .setRetentionPolicy("autogen")
+        .build();
+  }
+
+  @AutoValue
+  public abstract static class Read extends PTransform<PBegin, PCollection<String>> {
+
+    abstract boolean sslInvalidHostNameAllowed();
+
+    abstract String retentionPolicy();
+
+    @Nullable
+    abstract String database();
+
+    @Nullable
+    abstract String query();
+
+    abstract boolean sslEnabled();
+
+    @Nullable
+    abstract DataSourceConfiguration dataSourceConfiguration();
+
+    @Nullable
+    abstract List<String> metrics();
+
+    abstract DateTime startDateTime();
+
+    abstract DateTime endDateTime();
+
+    @Nullable
+    abstract DateTime fromDateTime();
+
+    @Nullable
+    abstract DateTime toDateTime();
+
+    abstract Builder builder();
+
+    @AutoValue.Builder
+    abstract static class Builder {
+      abstract Builder setDataSourceConfiguration(DataSourceConfiguration configuration);
+
+      abstract Builder setDatabase(String database);
+
+      abstract Builder setSslInvalidHostNameAllowed(boolean value);
+
+      abstract Builder setRetentionPolicy(String retentionPolicy);
+
+      abstract Builder setQuery(String query);
+
+      abstract Builder setToDateTime(DateTime toDateTime);
+
+      abstract Builder setFromDateTime(DateTime fromDateTime);
+
+      abstract Builder setStartDateTime(DateTime startDateTime);
+
+      abstract Builder setEndDateTime(DateTime endDateTime);
+
+      abstract Builder setSslEnabled(boolean sslEnabled);
+
+      abstract Builder setMetrics(List<String> metrics);
+
+      abstract Read build();
+    }
+
+    /** Reads from the InfluxDB instance indicated by the given configuration. */
+    public Read withDataSourceConfiguration(DataSourceConfiguration configuration) {
+      checkArgument(configuration != null, "configuration can not be null");
+      return builder().setDataSourceConfiguration(configuration).build();
+    }
+
+    /** Reads from the specified database. */
+    public Read withDatabase(String database) {
+      return builder()
+          .setDatabase(database)
+          .setDataSourceConfiguration(dataSourceConfiguration())
+          .build();
+    }
+
+    public Read withToDateTime(DateTime toDateTime) {
+      return builder().setToDateTime(toDateTime).build();
+    }
+
+    public Read withFromDateTime(DateTime fromDateTime) {
+      return builder().setFromDateTime(fromDateTime).build();
+    }
+
+    public Read withStartDateTime(DateTime startDateTime) {
+      return builder().setStartDateTime(startDateTime).build();
+    }
+
+    public Read withEndDateTime(DateTime endDateTime) {
+      return builder().setEndDateTime(endDateTime).build();
+    }
+
+    public Read withMetrics(List<String> metrics) {
+      return builder().setMetrics(metrics).build();
+    }
+
+    public Read withMetrics(String... metrics) {
+      return withMetrics(Arrays.asList(metrics));
+    }
+
+    public Read withSslEnabled(boolean sslEnabled) {
+      return builder().setSslEnabled(sslEnabled).build();
+    }
+
+    public Read withSslInvalidHostNameAllowed(boolean value) {
+      return builder().setSslInvalidHostNameAllowed(value).build();
+    }
+
+    public Read withRetentionPolicy(String retentionPolicy) {
+      return builder().setRetentionPolicy(retentionPolicy).build();
+    }
+
+    public Read withQuery(String query) {
+      return builder().setQuery(query).build();
+    }
+
+    @Override
+    public PCollection<String> expand(PBegin input) {
+      checkArgument(dataSourceConfiguration() != null, "configuration is required");
+      checkArgument(query() != null || database() != null, "database or query is required");
+      if (database() != null) {
+        checkArgument(
+            checkDatabase(
+                database(), dataSourceConfiguration(), sslInvalidHostNameAllowed(), sslEnabled()),
+            "Database %s does not exist",
+            database());
+      }
+      return input.apply(org.apache.beam.sdk.io.Read.from(new InfluxDBSource(this)));
+    }
+
+    @Override
+    public void populateDisplayData(DisplayData.Builder builder) {
+      super.populateDisplayData(builder);
+      builder.addIfNotNull(
+          DisplayData.item("dataSourceConfiguration", dataSourceConfiguration().toString()));
+      builder.addIfNotNull(DisplayData.item("database", database()));
+      builder.addIfNotNull(DisplayData.item("retentionPolicy", retentionPolicy()));
+      builder.addIfNotNull(DisplayData.item("sslEnabled", sslEnabled()));
+      builder.addIfNotNull(DisplayData.item("query", query()));
+      builder.addIfNotNull(
+          DisplayData.item("sslInvalidHostNameAllowed", sslInvalidHostNameAllowed()));
+    }
+  }
+
+  static class InfluxDBSource extends BoundedSource<String> {
+    private final Read spec;
+
+    InfluxDBSource(Read read) {
+      this.spec = read;
+    }
+
+    @Override
+    public long getEstimatedSizeBytes(PipelineOptions pipelineOptions) {
+      String noOfBlocks = "NUMBER OF BLOCKS";
+      String sizeOfBlocks = "SIZE OF BLOCKS";
+      LinkedHashSet<Long> noOfBlocksValue = new LinkedHashSet<>();
+      LinkedHashSet<Long> sizeOfBlocksValue = new LinkedHashSet<>();
+      try (InfluxDB connection =
+          getConnection(
+              spec.dataSourceConfiguration(),
+              spec.sslInvalidHostNameAllowed(),
+              spec.sslEnabled())) {
+        String query = spec.query();
+        if (query == null) {
+          query =
+              String.format(
+                  "SELECT * FROM %s.%s", spec.retentionPolicy(), String.join(",", spec.metrics()));
+        }
+        QueryResult result = connection.query(new Query(query, spec.database()));
+        List<Result> results = result.getResults();

Review comment:
       How big this result can be in terms of amount of returned data?

##########
File path: sdks/java/io/influxdb/src/main/java/org/apache/beam/sdk/io/influxdb/InfluxDBIO.java
##########
@@ -0,0 +1,829 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.apache.beam.sdk.io.influxdb;
+
+import static org.apache.beam.vendor.guava.v26_0_jre.com.google.common.base.Preconditions.checkArgument;
+import static org.influxdb.BatchOptions.DEFAULT_BATCH_INTERVAL_DURATION;
+import static org.influxdb.BatchOptions.DEFAULT_BUFFER_LIMIT;
+
+import com.google.auto.value.AutoValue;
+import java.io.Serializable;
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.Collections;
+import java.util.Iterator;
+import java.util.LinkedHashSet;
+import java.util.List;
+import javax.annotation.Nullable;
+import javax.net.ssl.SSLContext;
+import javax.net.ssl.SSLSocketFactory;
+import javax.net.ssl.TrustManager;
+import javax.net.ssl.X509TrustManager;
+import okhttp3.OkHttpClient;
+import org.apache.beam.sdk.annotations.Experimental;
+import org.apache.beam.sdk.coders.Coder;
+import org.apache.beam.sdk.coders.StringUtf8Coder;
+import org.apache.beam.sdk.io.BoundedSource;
+import org.apache.beam.sdk.options.PipelineOptions;
+import org.apache.beam.sdk.options.ValueProvider;
+import org.apache.beam.sdk.transforms.DoFn;
+import org.apache.beam.sdk.transforms.PTransform;
+import org.apache.beam.sdk.transforms.ParDo;
+import org.apache.beam.sdk.transforms.SerializableFunction;
+import org.apache.beam.sdk.transforms.display.DisplayData;
+import org.apache.beam.sdk.transforms.display.HasDisplayData;
+import org.apache.beam.sdk.values.PBegin;
+import org.apache.beam.sdk.values.PCollection;
+import org.apache.beam.sdk.values.PDone;
+import org.influxdb.BatchOptions;
+import org.influxdb.InfluxDB;
+import org.influxdb.InfluxDBFactory;
+import org.influxdb.dto.Query;
+import org.influxdb.dto.QueryResult;
+import org.influxdb.dto.QueryResult.Result;
+import org.influxdb.dto.QueryResult.Series;
+import org.joda.time.DateTime;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+/**
+ * IO to read and write to InfluxDB.
+ *
+ * <h3>Reading from InfluxDB</h3>
+ *
+ * <p>InfluxDBIO {@link #read()} returns a bounded collection of {@code String} as a {@code
+ * PCollection<String>}.
+ *
+ * <p>you have to provide a {@link DataSourceConfiguration} using<br>
+ * {@link DataSourceConfiguration#create(String, String, String)}(url, userName and password).
+ * Optionally, {@link DataSourceConfiguration#withUsername(String)} and {@link
+ * DataSourceConfiguration#withPassword(String)} allows you to define userName and password.
+ *
+ * <p>For example:
+ *
+ * <pre>{@code
+ * PCollection<String> collection = pipeline.apply(InfluxDBIO.read()
+ *   .withDataSourceConfiguration(InfluxDBIO.DataSourceConfiguration.create(
+ *          "https://localhost:8086","userName","password"))
+ *   .withDatabase("metrics")
+ *   .withRetentionPolicy("autogen")
+ *   .withSslInvalidHostNameAllowed(true)
+ *   .withSslEnabled(true));
+ * }</pre>
+ *
+ * <p>Read with query example:
+ *
+ * <pre>{@code
+ * PCollection<String> collection = pipeline.apply(InfluxDBIO.read()
+ *   .withDataSourceConfiguration(InfluxDBIO.DataSourceConfiguration.create(
+ *          "https://localhost:8086","userName","password"))
+ *   .withDatabase("metrics")
+ *   .withQuery("SELECT * FROM CPU")
+ *   .withRetentionPolicy("autogen")
+ *   .withSslInvalidHostNameAllowed(true)
+ *   .withSslEnabled(true));
+ * }</pre>
+ *
+ * <h3>Writing to InfluxDB </h3>
+ *
+ * <p>InfluxDB sink supports writing records into a database. It writes a {@link PCollection} to the
+ * database by converting each T. The T should implement getLineProtocol() from {@link
+ * LineProtocolConvertable}.
+ *
+ * <p>Like the {@link #read()}, to configure the {@link #write()}, you have to provide a {@link
+ * DataSourceConfiguration}.
+ *
+ * <pre>{@code
+ * pipeline
+ *   .apply(...)
+ *   .apply(InfluxDb.write()
+ *      .withDataSourceConfiguration(InfluxDBIO.DataSourceConfiguration.create(
+ *            "https://localhost:8086","userName","password"))
+ *   .withRetentionPolicy("autogen")
+ *   .withDatabase("metrics")
+ *   .withSslInvalidHostNameAllowed(true)
+ *   .withSslEnabled(true));
+ *    );
+ * }</pre>
+ *
+ * *
+ */
+@Experimental(Experimental.Kind.SOURCE_SINK)
+public class InfluxDBIO {
+  private static final Logger LOG = LoggerFactory.getLogger(InfluxDBIO.class);
+
+  public static Write write() {
+    return new AutoValue_InfluxDBIO_Write.Builder()
+        .setSslEnabled(false)
+        .setSslInvalidHostNameAllowed(false)
+        .setFlushDuration(DEFAULT_BATCH_INTERVAL_DURATION)
+        .setNoOfElementsToBatch(DEFAULT_BUFFER_LIMIT)
+        .build();
+  }
+
+  public static Read read() {
+    return new AutoValue_InfluxDBIO_Read.Builder()
+        .setSslEnabled(false)
+        .setSslInvalidHostNameAllowed(false)
+        .setStartDateTime(DateTime.parse("1677-09-21T00:12:43.145224194Z"))
+        .setEndDateTime(DateTime.parse("2262-04-11T23:47:16.854775806Z"))
+        .setRetentionPolicy("autogen")
+        .build();
+  }
+
+  @AutoValue
+  public abstract static class Read extends PTransform<PBegin, PCollection<String>> {
+
+    abstract boolean sslInvalidHostNameAllowed();
+
+    abstract String retentionPolicy();
+
+    @Nullable
+    abstract String database();
+
+    @Nullable
+    abstract String query();
+
+    abstract boolean sslEnabled();
+
+    @Nullable
+    abstract DataSourceConfiguration dataSourceConfiguration();
+
+    @Nullable
+    abstract List<String> metrics();
+
+    abstract DateTime startDateTime();
+
+    abstract DateTime endDateTime();
+
+    @Nullable
+    abstract DateTime fromDateTime();
+
+    @Nullable
+    abstract DateTime toDateTime();
+
+    abstract Builder builder();
+
+    @AutoValue.Builder
+    abstract static class Builder {
+      abstract Builder setDataSourceConfiguration(DataSourceConfiguration configuration);
+
+      abstract Builder setDatabase(String database);
+
+      abstract Builder setSslInvalidHostNameAllowed(boolean value);
+
+      abstract Builder setRetentionPolicy(String retentionPolicy);
+
+      abstract Builder setQuery(String query);
+
+      abstract Builder setToDateTime(DateTime toDateTime);
+
+      abstract Builder setFromDateTime(DateTime fromDateTime);
+
+      abstract Builder setStartDateTime(DateTime startDateTime);
+
+      abstract Builder setEndDateTime(DateTime endDateTime);
+
+      abstract Builder setSslEnabled(boolean sslEnabled);
+
+      abstract Builder setMetrics(List<String> metrics);
+
+      abstract Read build();
+    }
+
+    /** Reads from the InfluxDB instance indicated by the given configuration. */
+    public Read withDataSourceConfiguration(DataSourceConfiguration configuration) {
+      checkArgument(configuration != null, "configuration can not be null");
+      return builder().setDataSourceConfiguration(configuration).build();
+    }
+
+    /** Reads from the specified database. */
+    public Read withDatabase(String database) {
+      return builder()
+          .setDatabase(database)
+          .setDataSourceConfiguration(dataSourceConfiguration())
+          .build();
+    }
+
+    public Read withToDateTime(DateTime toDateTime) {
+      return builder().setToDateTime(toDateTime).build();
+    }
+
+    public Read withFromDateTime(DateTime fromDateTime) {
+      return builder().setFromDateTime(fromDateTime).build();
+    }
+
+    public Read withStartDateTime(DateTime startDateTime) {
+      return builder().setStartDateTime(startDateTime).build();
+    }
+
+    public Read withEndDateTime(DateTime endDateTime) {
+      return builder().setEndDateTime(endDateTime).build();
+    }
+
+    public Read withMetrics(List<String> metrics) {
+      return builder().setMetrics(metrics).build();
+    }
+
+    public Read withMetrics(String... metrics) {
+      return withMetrics(Arrays.asList(metrics));
+    }
+
+    public Read withSslEnabled(boolean sslEnabled) {
+      return builder().setSslEnabled(sslEnabled).build();
+    }
+
+    public Read withSslInvalidHostNameAllowed(boolean value) {
+      return builder().setSslInvalidHostNameAllowed(value).build();
+    }
+
+    public Read withRetentionPolicy(String retentionPolicy) {
+      return builder().setRetentionPolicy(retentionPolicy).build();
+    }
+
+    public Read withQuery(String query) {
+      return builder().setQuery(query).build();
+    }
+
+    @Override
+    public PCollection<String> expand(PBegin input) {
+      checkArgument(dataSourceConfiguration() != null, "configuration is required");
+      checkArgument(query() != null || database() != null, "database or query is required");
+      if (database() != null) {
+        checkArgument(
+            checkDatabase(
+                database(), dataSourceConfiguration(), sslInvalidHostNameAllowed(), sslEnabled()),
+            "Database %s does not exist",
+            database());
+      }
+      return input.apply(org.apache.beam.sdk.io.Read.from(new InfluxDBSource(this)));
+    }
+
+    @Override
+    public void populateDisplayData(DisplayData.Builder builder) {
+      super.populateDisplayData(builder);
+      builder.addIfNotNull(
+          DisplayData.item("dataSourceConfiguration", dataSourceConfiguration().toString()));
+      builder.addIfNotNull(DisplayData.item("database", database()));
+      builder.addIfNotNull(DisplayData.item("retentionPolicy", retentionPolicy()));
+      builder.addIfNotNull(DisplayData.item("sslEnabled", sslEnabled()));
+      builder.addIfNotNull(DisplayData.item("query", query()));
+      builder.addIfNotNull(
+          DisplayData.item("sslInvalidHostNameAllowed", sslInvalidHostNameAllowed()));
+    }
+  }
+
+  static class InfluxDBSource extends BoundedSource<String> {
+    private final Read spec;
+
+    InfluxDBSource(Read read) {
+      this.spec = read;
+    }
+
+    @Override
+    public long getEstimatedSizeBytes(PipelineOptions pipelineOptions) {
+      String noOfBlocks = "NUMBER OF BLOCKS";

Review comment:
       nit: `numOfBlocks`

##########
File path: sdks/java/io/influxdb/src/main/java/org/apache/beam/sdk/io/influxdb/InfluxDBIO.java
##########
@@ -0,0 +1,829 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.apache.beam.sdk.io.influxdb;
+
+import static org.apache.beam.vendor.guava.v26_0_jre.com.google.common.base.Preconditions.checkArgument;
+import static org.influxdb.BatchOptions.DEFAULT_BATCH_INTERVAL_DURATION;
+import static org.influxdb.BatchOptions.DEFAULT_BUFFER_LIMIT;
+
+import com.google.auto.value.AutoValue;
+import java.io.Serializable;
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.Collections;
+import java.util.Iterator;
+import java.util.LinkedHashSet;
+import java.util.List;
+import javax.annotation.Nullable;
+import javax.net.ssl.SSLContext;
+import javax.net.ssl.SSLSocketFactory;
+import javax.net.ssl.TrustManager;
+import javax.net.ssl.X509TrustManager;
+import okhttp3.OkHttpClient;
+import org.apache.beam.sdk.annotations.Experimental;
+import org.apache.beam.sdk.coders.Coder;
+import org.apache.beam.sdk.coders.StringUtf8Coder;
+import org.apache.beam.sdk.io.BoundedSource;
+import org.apache.beam.sdk.options.PipelineOptions;
+import org.apache.beam.sdk.options.ValueProvider;
+import org.apache.beam.sdk.transforms.DoFn;
+import org.apache.beam.sdk.transforms.PTransform;
+import org.apache.beam.sdk.transforms.ParDo;
+import org.apache.beam.sdk.transforms.SerializableFunction;
+import org.apache.beam.sdk.transforms.display.DisplayData;
+import org.apache.beam.sdk.transforms.display.HasDisplayData;
+import org.apache.beam.sdk.values.PBegin;
+import org.apache.beam.sdk.values.PCollection;
+import org.apache.beam.sdk.values.PDone;
+import org.influxdb.BatchOptions;
+import org.influxdb.InfluxDB;
+import org.influxdb.InfluxDBFactory;
+import org.influxdb.dto.Query;
+import org.influxdb.dto.QueryResult;
+import org.influxdb.dto.QueryResult.Result;
+import org.influxdb.dto.QueryResult.Series;
+import org.joda.time.DateTime;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+/**
+ * IO to read and write to InfluxDB.
+ *
+ * <h3>Reading from InfluxDB</h3>
+ *
+ * <p>InfluxDBIO {@link #read()} returns a bounded collection of {@code String} as a {@code
+ * PCollection<String>}.
+ *
+ * <p>you have to provide a {@link DataSourceConfiguration} using<br>
+ * {@link DataSourceConfiguration#create(String, String, String)}(url, userName and password).
+ * Optionally, {@link DataSourceConfiguration#withUsername(String)} and {@link
+ * DataSourceConfiguration#withPassword(String)} allows you to define userName and password.
+ *
+ * <p>For example:
+ *
+ * <pre>{@code
+ * PCollection<String> collection = pipeline.apply(InfluxDBIO.read()
+ *   .withDataSourceConfiguration(InfluxDBIO.DataSourceConfiguration.create(
+ *          "https://localhost:8086","userName","password"))
+ *   .withDatabase("metrics")
+ *   .withRetentionPolicy("autogen")
+ *   .withSslInvalidHostNameAllowed(true)
+ *   .withSslEnabled(true));
+ * }</pre>
+ *
+ * <p>Read with query example:
+ *
+ * <pre>{@code
+ * PCollection<String> collection = pipeline.apply(InfluxDBIO.read()
+ *   .withDataSourceConfiguration(InfluxDBIO.DataSourceConfiguration.create(
+ *          "https://localhost:8086","userName","password"))
+ *   .withDatabase("metrics")
+ *   .withQuery("SELECT * FROM CPU")
+ *   .withRetentionPolicy("autogen")
+ *   .withSslInvalidHostNameAllowed(true)
+ *   .withSslEnabled(true));
+ * }</pre>
+ *
+ * <h3>Writing to InfluxDB </h3>
+ *
+ * <p>InfluxDB sink supports writing records into a database. It writes a {@link PCollection} to the
+ * database by converting each T. The T should implement getLineProtocol() from {@link
+ * LineProtocolConvertable}.
+ *
+ * <p>Like the {@link #read()}, to configure the {@link #write()}, you have to provide a {@link
+ * DataSourceConfiguration}.
+ *
+ * <pre>{@code
+ * pipeline
+ *   .apply(...)
+ *   .apply(InfluxDb.write()
+ *      .withDataSourceConfiguration(InfluxDBIO.DataSourceConfiguration.create(
+ *            "https://localhost:8086","userName","password"))
+ *   .withRetentionPolicy("autogen")
+ *   .withDatabase("metrics")
+ *   .withSslInvalidHostNameAllowed(true)
+ *   .withSslEnabled(true));
+ *    );
+ * }</pre>
+ *
+ * *
+ */
+@Experimental(Experimental.Kind.SOURCE_SINK)
+public class InfluxDBIO {
+  private static final Logger LOG = LoggerFactory.getLogger(InfluxDBIO.class);
+
+  public static Write write() {
+    return new AutoValue_InfluxDBIO_Write.Builder()
+        .setSslEnabled(false)
+        .setSslInvalidHostNameAllowed(false)
+        .setFlushDuration(DEFAULT_BATCH_INTERVAL_DURATION)
+        .setNoOfElementsToBatch(DEFAULT_BUFFER_LIMIT)
+        .build();
+  }
+
+  public static Read read() {
+    return new AutoValue_InfluxDBIO_Read.Builder()
+        .setSslEnabled(false)
+        .setSslInvalidHostNameAllowed(false)
+        .setStartDateTime(DateTime.parse("1677-09-21T00:12:43.145224194Z"))
+        .setEndDateTime(DateTime.parse("2262-04-11T23:47:16.854775806Z"))
+        .setRetentionPolicy("autogen")
+        .build();
+  }
+
+  @AutoValue
+  public abstract static class Read extends PTransform<PBegin, PCollection<String>> {
+
+    abstract boolean sslInvalidHostNameAllowed();
+
+    abstract String retentionPolicy();
+
+    @Nullable
+    abstract String database();
+
+    @Nullable
+    abstract String query();
+
+    abstract boolean sslEnabled();
+
+    @Nullable
+    abstract DataSourceConfiguration dataSourceConfiguration();
+
+    @Nullable
+    abstract List<String> metrics();
+
+    abstract DateTime startDateTime();
+
+    abstract DateTime endDateTime();
+
+    @Nullable
+    abstract DateTime fromDateTime();
+
+    @Nullable
+    abstract DateTime toDateTime();
+
+    abstract Builder builder();
+
+    @AutoValue.Builder
+    abstract static class Builder {
+      abstract Builder setDataSourceConfiguration(DataSourceConfiguration configuration);
+
+      abstract Builder setDatabase(String database);
+
+      abstract Builder setSslInvalidHostNameAllowed(boolean value);
+
+      abstract Builder setRetentionPolicy(String retentionPolicy);
+
+      abstract Builder setQuery(String query);
+
+      abstract Builder setToDateTime(DateTime toDateTime);
+
+      abstract Builder setFromDateTime(DateTime fromDateTime);
+
+      abstract Builder setStartDateTime(DateTime startDateTime);
+
+      abstract Builder setEndDateTime(DateTime endDateTime);
+
+      abstract Builder setSslEnabled(boolean sslEnabled);
+
+      abstract Builder setMetrics(List<String> metrics);
+
+      abstract Read build();
+    }
+
+    /** Reads from the InfluxDB instance indicated by the given configuration. */
+    public Read withDataSourceConfiguration(DataSourceConfiguration configuration) {
+      checkArgument(configuration != null, "configuration can not be null");
+      return builder().setDataSourceConfiguration(configuration).build();
+    }
+
+    /** Reads from the specified database. */
+    public Read withDatabase(String database) {
+      return builder()
+          .setDatabase(database)
+          .setDataSourceConfiguration(dataSourceConfiguration())
+          .build();
+    }
+
+    public Read withToDateTime(DateTime toDateTime) {
+      return builder().setToDateTime(toDateTime).build();
+    }
+
+    public Read withFromDateTime(DateTime fromDateTime) {
+      return builder().setFromDateTime(fromDateTime).build();
+    }
+
+    public Read withStartDateTime(DateTime startDateTime) {
+      return builder().setStartDateTime(startDateTime).build();
+    }
+
+    public Read withEndDateTime(DateTime endDateTime) {
+      return builder().setEndDateTime(endDateTime).build();
+    }
+
+    public Read withMetrics(List<String> metrics) {
+      return builder().setMetrics(metrics).build();
+    }
+
+    public Read withMetrics(String... metrics) {
+      return withMetrics(Arrays.asList(metrics));
+    }
+
+    public Read withSslEnabled(boolean sslEnabled) {
+      return builder().setSslEnabled(sslEnabled).build();
+    }
+
+    public Read withSslInvalidHostNameAllowed(boolean value) {
+      return builder().setSslInvalidHostNameAllowed(value).build();
+    }
+
+    public Read withRetentionPolicy(String retentionPolicy) {
+      return builder().setRetentionPolicy(retentionPolicy).build();
+    }
+
+    public Read withQuery(String query) {
+      return builder().setQuery(query).build();
+    }
+
+    @Override
+    public PCollection<String> expand(PBegin input) {
+      checkArgument(dataSourceConfiguration() != null, "configuration is required");
+      checkArgument(query() != null || database() != null, "database or query is required");
+      if (database() != null) {
+        checkArgument(
+            checkDatabase(
+                database(), dataSourceConfiguration(), sslInvalidHostNameAllowed(), sslEnabled()),
+            "Database %s does not exist",
+            database());
+      }
+      return input.apply(org.apache.beam.sdk.io.Read.from(new InfluxDBSource(this)));
+    }
+
+    @Override
+    public void populateDisplayData(DisplayData.Builder builder) {
+      super.populateDisplayData(builder);
+      builder.addIfNotNull(
+          DisplayData.item("dataSourceConfiguration", dataSourceConfiguration().toString()));
+      builder.addIfNotNull(DisplayData.item("database", database()));
+      builder.addIfNotNull(DisplayData.item("retentionPolicy", retentionPolicy()));
+      builder.addIfNotNull(DisplayData.item("sslEnabled", sslEnabled()));
+      builder.addIfNotNull(DisplayData.item("query", query()));
+      builder.addIfNotNull(
+          DisplayData.item("sslInvalidHostNameAllowed", sslInvalidHostNameAllowed()));
+    }
+  }
+
+  static class InfluxDBSource extends BoundedSource<String> {
+    private final Read spec;
+
+    InfluxDBSource(Read read) {
+      this.spec = read;
+    }
+
+    @Override
+    public long getEstimatedSizeBytes(PipelineOptions pipelineOptions) {
+      String noOfBlocks = "NUMBER OF BLOCKS";
+      String sizeOfBlocks = "SIZE OF BLOCKS";
+      LinkedHashSet<Long> noOfBlocksValue = new LinkedHashSet<>();
+      LinkedHashSet<Long> sizeOfBlocksValue = new LinkedHashSet<>();
+      try (InfluxDB connection =
+          getConnection(
+              spec.dataSourceConfiguration(),
+              spec.sslInvalidHostNameAllowed(),
+              spec.sslEnabled())) {
+        String query = spec.query();
+        if (query == null) {
+          query =
+              String.format(
+                  "SELECT * FROM %s.%s", spec.retentionPolicy(), String.join(",", spec.metrics()));
+        }
+        QueryResult result = connection.query(new Query(query, spec.database()));
+        List<Result> results = result.getResults();
+        for (Result res : results) {
+          for (Series series : res.getSeries()) {
+            for (List<Object> data : series.getValues()) {
+              String s = data.get(0).toString();
+              if (s.startsWith(noOfBlocks)) {
+                noOfBlocksValue.add(Long.parseLong(s.split(":", -1)[1].trim()));
+              }
+              if (s.startsWith(sizeOfBlocks)) {
+                sizeOfBlocksValue.add(Long.parseLong(s.split(":", -1)[1].trim()));
+              }
+            }
+          }
+        }
+      }
+
+      Iterator<Long> noOfBlocksValueItr = noOfBlocksValue.iterator();
+      Iterator<Long> sizeOfBlocksValueItr = sizeOfBlocksValue.iterator();

Review comment:
       nit: sizeOfBlocksValueIterator

##########
File path: sdks/java/io/influxdb/src/main/java/org/apache/beam/sdk/io/influxdb/InfluxDBIO.java
##########
@@ -0,0 +1,829 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.apache.beam.sdk.io.influxdb;
+
+import static org.apache.beam.vendor.guava.v26_0_jre.com.google.common.base.Preconditions.checkArgument;
+import static org.influxdb.BatchOptions.DEFAULT_BATCH_INTERVAL_DURATION;
+import static org.influxdb.BatchOptions.DEFAULT_BUFFER_LIMIT;
+
+import com.google.auto.value.AutoValue;
+import java.io.Serializable;
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.Collections;
+import java.util.Iterator;
+import java.util.LinkedHashSet;
+import java.util.List;
+import javax.annotation.Nullable;
+import javax.net.ssl.SSLContext;
+import javax.net.ssl.SSLSocketFactory;
+import javax.net.ssl.TrustManager;
+import javax.net.ssl.X509TrustManager;
+import okhttp3.OkHttpClient;
+import org.apache.beam.sdk.annotations.Experimental;
+import org.apache.beam.sdk.coders.Coder;
+import org.apache.beam.sdk.coders.StringUtf8Coder;
+import org.apache.beam.sdk.io.BoundedSource;
+import org.apache.beam.sdk.options.PipelineOptions;
+import org.apache.beam.sdk.options.ValueProvider;
+import org.apache.beam.sdk.transforms.DoFn;
+import org.apache.beam.sdk.transforms.PTransform;
+import org.apache.beam.sdk.transforms.ParDo;
+import org.apache.beam.sdk.transforms.SerializableFunction;
+import org.apache.beam.sdk.transforms.display.DisplayData;
+import org.apache.beam.sdk.transforms.display.HasDisplayData;
+import org.apache.beam.sdk.values.PBegin;
+import org.apache.beam.sdk.values.PCollection;
+import org.apache.beam.sdk.values.PDone;
+import org.influxdb.BatchOptions;
+import org.influxdb.InfluxDB;
+import org.influxdb.InfluxDBFactory;
+import org.influxdb.dto.Query;
+import org.influxdb.dto.QueryResult;
+import org.influxdb.dto.QueryResult.Result;
+import org.influxdb.dto.QueryResult.Series;
+import org.joda.time.DateTime;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+/**
+ * IO to read and write to InfluxDB.
+ *
+ * <h3>Reading from InfluxDB</h3>
+ *
+ * <p>InfluxDBIO {@link #read()} returns a bounded collection of {@code String} as a {@code
+ * PCollection<String>}.
+ *
+ * <p>you have to provide a {@link DataSourceConfiguration} using<br>
+ * {@link DataSourceConfiguration#create(String, String, String)}(url, userName and password).
+ * Optionally, {@link DataSourceConfiguration#withUsername(String)} and {@link
+ * DataSourceConfiguration#withPassword(String)} allows you to define userName and password.
+ *
+ * <p>For example:
+ *
+ * <pre>{@code
+ * PCollection<String> collection = pipeline.apply(InfluxDBIO.read()
+ *   .withDataSourceConfiguration(InfluxDBIO.DataSourceConfiguration.create(
+ *          "https://localhost:8086","userName","password"))
+ *   .withDatabase("metrics")
+ *   .withRetentionPolicy("autogen")
+ *   .withSslInvalidHostNameAllowed(true)
+ *   .withSslEnabled(true));
+ * }</pre>
+ *
+ * <p>Read with query example:
+ *
+ * <pre>{@code
+ * PCollection<String> collection = pipeline.apply(InfluxDBIO.read()
+ *   .withDataSourceConfiguration(InfluxDBIO.DataSourceConfiguration.create(
+ *          "https://localhost:8086","userName","password"))
+ *   .withDatabase("metrics")
+ *   .withQuery("SELECT * FROM CPU")
+ *   .withRetentionPolicy("autogen")
+ *   .withSslInvalidHostNameAllowed(true)
+ *   .withSslEnabled(true));
+ * }</pre>
+ *
+ * <h3>Writing to InfluxDB </h3>
+ *
+ * <p>InfluxDB sink supports writing records into a database. It writes a {@link PCollection} to the
+ * database by converting each T. The T should implement getLineProtocol() from {@link
+ * LineProtocolConvertable}.
+ *
+ * <p>Like the {@link #read()}, to configure the {@link #write()}, you have to provide a {@link
+ * DataSourceConfiguration}.
+ *
+ * <pre>{@code
+ * pipeline
+ *   .apply(...)
+ *   .apply(InfluxDb.write()
+ *      .withDataSourceConfiguration(InfluxDBIO.DataSourceConfiguration.create(
+ *            "https://localhost:8086","userName","password"))
+ *   .withRetentionPolicy("autogen")
+ *   .withDatabase("metrics")
+ *   .withSslInvalidHostNameAllowed(true)
+ *   .withSslEnabled(true));
+ *    );
+ * }</pre>
+ *
+ * *
+ */
+@Experimental(Experimental.Kind.SOURCE_SINK)
+public class InfluxDBIO {
+  private static final Logger LOG = LoggerFactory.getLogger(InfluxDBIO.class);
+
+  public static Write write() {
+    return new AutoValue_InfluxDBIO_Write.Builder()
+        .setSslEnabled(false)
+        .setSslInvalidHostNameAllowed(false)
+        .setFlushDuration(DEFAULT_BATCH_INTERVAL_DURATION)
+        .setNoOfElementsToBatch(DEFAULT_BUFFER_LIMIT)
+        .build();
+  }
+
+  public static Read read() {
+    return new AutoValue_InfluxDBIO_Read.Builder()
+        .setSslEnabled(false)
+        .setSslInvalidHostNameAllowed(false)
+        .setStartDateTime(DateTime.parse("1677-09-21T00:12:43.145224194Z"))
+        .setEndDateTime(DateTime.parse("2262-04-11T23:47:16.854775806Z"))
+        .setRetentionPolicy("autogen")
+        .build();
+  }
+
+  @AutoValue
+  public abstract static class Read extends PTransform<PBegin, PCollection<String>> {
+
+    abstract boolean sslInvalidHostNameAllowed();
+
+    abstract String retentionPolicy();
+
+    @Nullable
+    abstract String database();
+
+    @Nullable
+    abstract String query();
+
+    abstract boolean sslEnabled();
+
+    @Nullable
+    abstract DataSourceConfiguration dataSourceConfiguration();
+
+    @Nullable
+    abstract List<String> metrics();
+
+    abstract DateTime startDateTime();
+
+    abstract DateTime endDateTime();
+
+    @Nullable
+    abstract DateTime fromDateTime();
+
+    @Nullable
+    abstract DateTime toDateTime();
+
+    abstract Builder builder();
+
+    @AutoValue.Builder
+    abstract static class Builder {
+      abstract Builder setDataSourceConfiguration(DataSourceConfiguration configuration);
+
+      abstract Builder setDatabase(String database);
+
+      abstract Builder setSslInvalidHostNameAllowed(boolean value);
+
+      abstract Builder setRetentionPolicy(String retentionPolicy);
+
+      abstract Builder setQuery(String query);
+
+      abstract Builder setToDateTime(DateTime toDateTime);
+
+      abstract Builder setFromDateTime(DateTime fromDateTime);
+
+      abstract Builder setStartDateTime(DateTime startDateTime);
+
+      abstract Builder setEndDateTime(DateTime endDateTime);
+
+      abstract Builder setSslEnabled(boolean sslEnabled);
+
+      abstract Builder setMetrics(List<String> metrics);
+
+      abstract Read build();
+    }
+
+    /** Reads from the InfluxDB instance indicated by the given configuration. */
+    public Read withDataSourceConfiguration(DataSourceConfiguration configuration) {
+      checkArgument(configuration != null, "configuration can not be null");
+      return builder().setDataSourceConfiguration(configuration).build();
+    }
+
+    /** Reads from the specified database. */
+    public Read withDatabase(String database) {
+      return builder()
+          .setDatabase(database)
+          .setDataSourceConfiguration(dataSourceConfiguration())
+          .build();
+    }
+
+    public Read withToDateTime(DateTime toDateTime) {
+      return builder().setToDateTime(toDateTime).build();
+    }
+
+    public Read withFromDateTime(DateTime fromDateTime) {
+      return builder().setFromDateTime(fromDateTime).build();
+    }
+
+    public Read withStartDateTime(DateTime startDateTime) {
+      return builder().setStartDateTime(startDateTime).build();
+    }
+
+    public Read withEndDateTime(DateTime endDateTime) {
+      return builder().setEndDateTime(endDateTime).build();
+    }
+
+    public Read withMetrics(List<String> metrics) {
+      return builder().setMetrics(metrics).build();
+    }
+
+    public Read withMetrics(String... metrics) {
+      return withMetrics(Arrays.asList(metrics));
+    }
+
+    public Read withSslEnabled(boolean sslEnabled) {
+      return builder().setSslEnabled(sslEnabled).build();
+    }
+
+    public Read withSslInvalidHostNameAllowed(boolean value) {
+      return builder().setSslInvalidHostNameAllowed(value).build();
+    }
+
+    public Read withRetentionPolicy(String retentionPolicy) {
+      return builder().setRetentionPolicy(retentionPolicy).build();
+    }
+
+    public Read withQuery(String query) {
+      return builder().setQuery(query).build();
+    }
+
+    @Override
+    public PCollection<String> expand(PBegin input) {
+      checkArgument(dataSourceConfiguration() != null, "configuration is required");
+      checkArgument(query() != null || database() != null, "database or query is required");
+      if (database() != null) {
+        checkArgument(
+            checkDatabase(
+                database(), dataSourceConfiguration(), sslInvalidHostNameAllowed(), sslEnabled()),
+            "Database %s does not exist",
+            database());
+      }
+      return input.apply(org.apache.beam.sdk.io.Read.from(new InfluxDBSource(this)));
+    }
+
+    @Override
+    public void populateDisplayData(DisplayData.Builder builder) {
+      super.populateDisplayData(builder);
+      builder.addIfNotNull(
+          DisplayData.item("dataSourceConfiguration", dataSourceConfiguration().toString()));
+      builder.addIfNotNull(DisplayData.item("database", database()));
+      builder.addIfNotNull(DisplayData.item("retentionPolicy", retentionPolicy()));
+      builder.addIfNotNull(DisplayData.item("sslEnabled", sslEnabled()));
+      builder.addIfNotNull(DisplayData.item("query", query()));
+      builder.addIfNotNull(
+          DisplayData.item("sslInvalidHostNameAllowed", sslInvalidHostNameAllowed()));
+    }
+  }
+
+  static class InfluxDBSource extends BoundedSource<String> {
+    private final Read spec;
+
+    InfluxDBSource(Read read) {
+      this.spec = read;
+    }
+
+    @Override
+    public long getEstimatedSizeBytes(PipelineOptions pipelineOptions) {
+      String noOfBlocks = "NUMBER OF BLOCKS";
+      String sizeOfBlocks = "SIZE OF BLOCKS";
+      LinkedHashSet<Long> noOfBlocksValue = new LinkedHashSet<>();
+      LinkedHashSet<Long> sizeOfBlocksValue = new LinkedHashSet<>();
+      try (InfluxDB connection =
+          getConnection(
+              spec.dataSourceConfiguration(),
+              spec.sslInvalidHostNameAllowed(),
+              spec.sslEnabled())) {
+        String query = spec.query();
+        if (query == null) {
+          query =
+              String.format(
+                  "SELECT * FROM %s.%s", spec.retentionPolicy(), String.join(",", spec.metrics()));
+        }
+        QueryResult result = connection.query(new Query(query, spec.database()));
+        List<Result> results = result.getResults();
+        for (Result res : results) {
+          for (Series series : res.getSeries()) {
+            for (List<Object> data : series.getValues()) {
+              String s = data.get(0).toString();
+              if (s.startsWith(noOfBlocks)) {
+                noOfBlocksValue.add(Long.parseLong(s.split(":", -1)[1].trim()));
+              }
+              if (s.startsWith(sizeOfBlocks)) {
+                sizeOfBlocksValue.add(Long.parseLong(s.split(":", -1)[1].trim()));
+              }
+            }
+          }
+        }
+      }
+
+      Iterator<Long> noOfBlocksValueItr = noOfBlocksValue.iterator();
+      Iterator<Long> sizeOfBlocksValueItr = sizeOfBlocksValue.iterator();
+      long size = 0;
+      while (noOfBlocksValueItr.hasNext() && sizeOfBlocksValueItr.hasNext()) {
+        size = size + (noOfBlocksValueItr.next() * sizeOfBlocksValueItr.next());
+      }
+      return size;
+    }
+
+    @Override
+    public List<? extends BoundedSource<String>> split(
+        long desiredElementsInABundle, PipelineOptions options) {
+      List<ShardInformation> shardInfo =
+          getDBShardedInformation(
+              spec.database(),
+              spec.dataSourceConfiguration(),
+              spec.sslInvalidHostNameAllowed(),
+              spec.sslEnabled());
+      List<BoundedSource<String>> sources = new ArrayList<>();
+      if (spec.query() == null) {
+        for (ShardInformation sInfo : shardInfo) {
+          if (sInfo.getStartTime().compareTo(spec.startDateTime()) > 0) {
+            sources.add(
+                new InfluxDBSource(
+                    spec.withMetrics(spec.metrics())
+                        .withRetentionPolicy(sInfo.getRetentionPolicy())
+                        .withToDateTime(sInfo.getStartTime())
+                        .withFromDateTime(sInfo.getEndTime())));
+          }
+        }
+      } else {
+        sources.add(this);
+      }
+      return sources;
+    }
+
+    @Override
+    public BoundedReader<String> createReader(PipelineOptions pipelineOptions) {
+      return new BoundedInfluxDbReader(this);
+    }
+
+    @Override
+    public void validate() {
+      spec.validate(null /* input */);
+    }
+
+    @Override
+    public void populateDisplayData(DisplayData.Builder builder) {
+      spec.populateDisplayData(builder);
+    }
+
+    @Override
+    public Coder<String> getOutputCoder() {
+      return StringUtf8Coder.of();
+    }
+  }
+
+  private static String getQueryToRun(Read spec) {
+    if (spec.query() == null) {
+      if (spec.toDateTime() != null && spec.fromDateTime() != null) {
+        return String.format(
+            "SELECT * FROM %s.%s WHERE time >= '%s' and time <= '%s'",
+            spec.retentionPolicy(),
+            String.join(",", spec.metrics()),
+            spec.toDateTime(),
+            spec.fromDateTime());
+      } else {
+        return String.format(
+            "SELECT * FROM %s.%s", spec.retentionPolicy(), String.join(",", spec.metrics()));
+      }
+    }
+    return spec.query();
+  }
+
+  private static class BoundedInfluxDbReader extends BoundedSource.BoundedReader<String> {
+    private final InfluxDBIO.InfluxDBSource source;
+    private Iterator<Result> resultIterator;
+    private Iterator<Series> seriesIterator;
+    private Iterator<List<Object>> valuesIterator;
+    private List current;
+
+    public BoundedInfluxDbReader(InfluxDBIO.InfluxDBSource source) {
+      this.source = source;
+    }
+
+    @Override
+    public boolean start() {
+      InfluxDBIO.Read spec = source.spec;
+      try (InfluxDB influxDB =
+          getConnection(
+              spec.dataSourceConfiguration(),
+              spec.sslInvalidHostNameAllowed(),
+              spec.sslEnabled())) {
+        if (spec.database() != null) {
+          influxDB.setDatabase(spec.database());
+        }
+        if (spec.retentionPolicy() != null) {
+          influxDB.setRetentionPolicy(spec.retentionPolicy());
+        }
+        String query = getQueryToRun(spec);
+        QueryResult queryResult = influxDB.query(new Query(query, spec.database()));
+        resultIterator = queryResult.getResults().iterator();
+        if (resultIterator.hasNext()) {
+          seriesIterator = resultIterator.next().getSeries().iterator();
+        }
+        if (seriesIterator.hasNext()) {
+          valuesIterator = seriesIterator.next().getValues().iterator();
+        }
+      }
+      return advance();
+    }
+
+    @Override
+    public boolean advance() {
+      if (valuesIterator.hasNext()) {
+        current = valuesIterator.next();
+        return true;
+      } else if (seriesIterator.hasNext()) {
+        valuesIterator = seriesIterator.next().getValues().iterator();
+        current = valuesIterator.next();
+        return true;
+      } else if (resultIterator.hasNext()) {
+        seriesIterator = resultIterator.next().getSeries().iterator();
+        valuesIterator = seriesIterator.next().getValues().iterator();
+        current = valuesIterator.next();
+        return true;
+      } else {
+        return false;
+      }
+    }
+
+    @Override
+    public BoundedSource getCurrentSource() {
+      return source;
+    }
+
+    @Override
+    public String getCurrent() {
+      return current.toString();
+    }
+
+    @Override
+    public void close() {}
+  }
+
+  @AutoValue
+  public abstract static class Write extends PTransform<PCollection<String>, PDone> {
+
+    @Override
+    public PDone expand(PCollection<String> input) {
+      checkArgument(dataSourceConfiguration() != null, "withConfiguration() is required");
+      checkArgument(database() != null && !database().isEmpty(), "withDatabase() is required");
+      checkArgument(
+          checkDatabase(
+              database(), dataSourceConfiguration(), sslInvalidHostNameAllowed(), sslEnabled()),
+          "Database %s does not exist",
+          database());
+      input.apply(ParDo.of(new InfluxWriterFn(this)));
+      return PDone.in(input.getPipeline());
+    }
+
+    @Override
+    public void populateDisplayData(DisplayData.Builder builder) {
+      super.populateDisplayData(builder);
+      builder.addIfNotNull(
+          DisplayData.item("dataSourceConfiguration", dataSourceConfiguration().toString()));
+      builder.addIfNotNull(DisplayData.item("database", database()));
+      builder.addIfNotNull(DisplayData.item("retentionPolicy", retentionPolicy()));
+      builder.addIfNotNull(DisplayData.item("sslEnabled", sslEnabled()));
+      builder.addIfNotNull(
+          DisplayData.item("sslInvalidHostNameAllowed", sslInvalidHostNameAllowed()));
+      builder.addIfNotNull(DisplayData.item("noOfElementsToBatch", noOfElementsToBatch()));
+      builder.addIfNotNull(DisplayData.item("flushDuration", flushDuration()));
+    }
+
+    @Nullable
+    abstract String database();
+
+    @Nullable
+    abstract String retentionPolicy();
+
+    abstract boolean sslInvalidHostNameAllowed();
+
+    abstract boolean sslEnabled();
+
+    abstract int noOfElementsToBatch();

Review comment:
       nit: `numOfElementsToBatch `

##########
File path: sdks/java/io/influxdb/src/main/java/org/apache/beam/sdk/io/influxdb/InfluxDBIO.java
##########
@@ -0,0 +1,829 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.apache.beam.sdk.io.influxdb;
+
+import static org.apache.beam.vendor.guava.v26_0_jre.com.google.common.base.Preconditions.checkArgument;
+import static org.influxdb.BatchOptions.DEFAULT_BATCH_INTERVAL_DURATION;
+import static org.influxdb.BatchOptions.DEFAULT_BUFFER_LIMIT;
+
+import com.google.auto.value.AutoValue;
+import java.io.Serializable;
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.Collections;
+import java.util.Iterator;
+import java.util.LinkedHashSet;
+import java.util.List;
+import javax.annotation.Nullable;
+import javax.net.ssl.SSLContext;
+import javax.net.ssl.SSLSocketFactory;
+import javax.net.ssl.TrustManager;
+import javax.net.ssl.X509TrustManager;
+import okhttp3.OkHttpClient;
+import org.apache.beam.sdk.annotations.Experimental;
+import org.apache.beam.sdk.coders.Coder;
+import org.apache.beam.sdk.coders.StringUtf8Coder;
+import org.apache.beam.sdk.io.BoundedSource;
+import org.apache.beam.sdk.options.PipelineOptions;
+import org.apache.beam.sdk.options.ValueProvider;
+import org.apache.beam.sdk.transforms.DoFn;
+import org.apache.beam.sdk.transforms.PTransform;
+import org.apache.beam.sdk.transforms.ParDo;
+import org.apache.beam.sdk.transforms.SerializableFunction;
+import org.apache.beam.sdk.transforms.display.DisplayData;
+import org.apache.beam.sdk.transforms.display.HasDisplayData;
+import org.apache.beam.sdk.values.PBegin;
+import org.apache.beam.sdk.values.PCollection;
+import org.apache.beam.sdk.values.PDone;
+import org.influxdb.BatchOptions;
+import org.influxdb.InfluxDB;
+import org.influxdb.InfluxDBFactory;
+import org.influxdb.dto.Query;
+import org.influxdb.dto.QueryResult;
+import org.influxdb.dto.QueryResult.Result;
+import org.influxdb.dto.QueryResult.Series;
+import org.joda.time.DateTime;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+/**
+ * IO to read and write to InfluxDB.
+ *
+ * <h3>Reading from InfluxDB</h3>
+ *
+ * <p>InfluxDBIO {@link #read()} returns a bounded collection of {@code String} as a {@code
+ * PCollection<String>}.
+ *
+ * <p>you have to provide a {@link DataSourceConfiguration} using<br>
+ * {@link DataSourceConfiguration#create(String, String, String)}(url, userName and password).
+ * Optionally, {@link DataSourceConfiguration#withUsername(String)} and {@link
+ * DataSourceConfiguration#withPassword(String)} allows you to define userName and password.
+ *
+ * <p>For example:
+ *
+ * <pre>{@code
+ * PCollection<String> collection = pipeline.apply(InfluxDBIO.read()
+ *   .withDataSourceConfiguration(InfluxDBIO.DataSourceConfiguration.create(
+ *          "https://localhost:8086","userName","password"))
+ *   .withDatabase("metrics")
+ *   .withRetentionPolicy("autogen")
+ *   .withSslInvalidHostNameAllowed(true)
+ *   .withSslEnabled(true));
+ * }</pre>
+ *
+ * <p>Read with query example:
+ *
+ * <pre>{@code
+ * PCollection<String> collection = pipeline.apply(InfluxDBIO.read()
+ *   .withDataSourceConfiguration(InfluxDBIO.DataSourceConfiguration.create(
+ *          "https://localhost:8086","userName","password"))
+ *   .withDatabase("metrics")
+ *   .withQuery("SELECT * FROM CPU")
+ *   .withRetentionPolicy("autogen")
+ *   .withSslInvalidHostNameAllowed(true)
+ *   .withSslEnabled(true));
+ * }</pre>
+ *
+ * <h3>Writing to InfluxDB </h3>
+ *
+ * <p>InfluxDB sink supports writing records into a database. It writes a {@link PCollection} to the
+ * database by converting each T. The T should implement getLineProtocol() from {@link
+ * LineProtocolConvertable}.
+ *
+ * <p>Like the {@link #read()}, to configure the {@link #write()}, you have to provide a {@link
+ * DataSourceConfiguration}.
+ *
+ * <pre>{@code
+ * pipeline
+ *   .apply(...)
+ *   .apply(InfluxDb.write()
+ *      .withDataSourceConfiguration(InfluxDBIO.DataSourceConfiguration.create(
+ *            "https://localhost:8086","userName","password"))
+ *   .withRetentionPolicy("autogen")
+ *   .withDatabase("metrics")
+ *   .withSslInvalidHostNameAllowed(true)
+ *   .withSslEnabled(true));
+ *    );
+ * }</pre>
+ *
+ * *
+ */
+@Experimental(Experimental.Kind.SOURCE_SINK)
+public class InfluxDBIO {
+  private static final Logger LOG = LoggerFactory.getLogger(InfluxDBIO.class);
+
+  public static Write write() {
+    return new AutoValue_InfluxDBIO_Write.Builder()
+        .setSslEnabled(false)
+        .setSslInvalidHostNameAllowed(false)
+        .setFlushDuration(DEFAULT_BATCH_INTERVAL_DURATION)
+        .setNoOfElementsToBatch(DEFAULT_BUFFER_LIMIT)
+        .build();
+  }
+
+  public static Read read() {
+    return new AutoValue_InfluxDBIO_Read.Builder()
+        .setSslEnabled(false)
+        .setSslInvalidHostNameAllowed(false)
+        .setStartDateTime(DateTime.parse("1677-09-21T00:12:43.145224194Z"))
+        .setEndDateTime(DateTime.parse("2262-04-11T23:47:16.854775806Z"))
+        .setRetentionPolicy("autogen")
+        .build();
+  }
+
+  @AutoValue
+  public abstract static class Read extends PTransform<PBegin, PCollection<String>> {
+
+    abstract boolean sslInvalidHostNameAllowed();
+
+    abstract String retentionPolicy();
+
+    @Nullable
+    abstract String database();
+
+    @Nullable
+    abstract String query();
+
+    abstract boolean sslEnabled();
+
+    @Nullable
+    abstract DataSourceConfiguration dataSourceConfiguration();
+
+    @Nullable
+    abstract List<String> metrics();
+
+    abstract DateTime startDateTime();
+
+    abstract DateTime endDateTime();
+
+    @Nullable
+    abstract DateTime fromDateTime();
+
+    @Nullable
+    abstract DateTime toDateTime();
+
+    abstract Builder builder();
+
+    @AutoValue.Builder
+    abstract static class Builder {
+      abstract Builder setDataSourceConfiguration(DataSourceConfiguration configuration);
+
+      abstract Builder setDatabase(String database);
+
+      abstract Builder setSslInvalidHostNameAllowed(boolean value);
+
+      abstract Builder setRetentionPolicy(String retentionPolicy);
+
+      abstract Builder setQuery(String query);
+
+      abstract Builder setToDateTime(DateTime toDateTime);
+
+      abstract Builder setFromDateTime(DateTime fromDateTime);
+
+      abstract Builder setStartDateTime(DateTime startDateTime);
+
+      abstract Builder setEndDateTime(DateTime endDateTime);
+
+      abstract Builder setSslEnabled(boolean sslEnabled);
+
+      abstract Builder setMetrics(List<String> metrics);
+
+      abstract Read build();
+    }
+
+    /** Reads from the InfluxDB instance indicated by the given configuration. */
+    public Read withDataSourceConfiguration(DataSourceConfiguration configuration) {
+      checkArgument(configuration != null, "configuration can not be null");
+      return builder().setDataSourceConfiguration(configuration).build();
+    }
+
+    /** Reads from the specified database. */
+    public Read withDatabase(String database) {
+      return builder()
+          .setDatabase(database)
+          .setDataSourceConfiguration(dataSourceConfiguration())
+          .build();
+    }
+
+    public Read withToDateTime(DateTime toDateTime) {
+      return builder().setToDateTime(toDateTime).build();
+    }
+
+    public Read withFromDateTime(DateTime fromDateTime) {
+      return builder().setFromDateTime(fromDateTime).build();
+    }
+
+    public Read withStartDateTime(DateTime startDateTime) {
+      return builder().setStartDateTime(startDateTime).build();
+    }
+
+    public Read withEndDateTime(DateTime endDateTime) {
+      return builder().setEndDateTime(endDateTime).build();
+    }
+
+    public Read withMetrics(List<String> metrics) {
+      return builder().setMetrics(metrics).build();
+    }
+
+    public Read withMetrics(String... metrics) {
+      return withMetrics(Arrays.asList(metrics));
+    }
+
+    public Read withSslEnabled(boolean sslEnabled) {
+      return builder().setSslEnabled(sslEnabled).build();
+    }
+
+    public Read withSslInvalidHostNameAllowed(boolean value) {
+      return builder().setSslInvalidHostNameAllowed(value).build();
+    }
+
+    public Read withRetentionPolicy(String retentionPolicy) {
+      return builder().setRetentionPolicy(retentionPolicy).build();
+    }
+
+    public Read withQuery(String query) {
+      return builder().setQuery(query).build();
+    }
+
+    @Override
+    public PCollection<String> expand(PBegin input) {
+      checkArgument(dataSourceConfiguration() != null, "configuration is required");
+      checkArgument(query() != null || database() != null, "database or query is required");
+      if (database() != null) {
+        checkArgument(
+            checkDatabase(
+                database(), dataSourceConfiguration(), sslInvalidHostNameAllowed(), sslEnabled()),
+            "Database %s does not exist",
+            database());
+      }
+      return input.apply(org.apache.beam.sdk.io.Read.from(new InfluxDBSource(this)));
+    }
+
+    @Override
+    public void populateDisplayData(DisplayData.Builder builder) {
+      super.populateDisplayData(builder);
+      builder.addIfNotNull(
+          DisplayData.item("dataSourceConfiguration", dataSourceConfiguration().toString()));
+      builder.addIfNotNull(DisplayData.item("database", database()));
+      builder.addIfNotNull(DisplayData.item("retentionPolicy", retentionPolicy()));
+      builder.addIfNotNull(DisplayData.item("sslEnabled", sslEnabled()));
+      builder.addIfNotNull(DisplayData.item("query", query()));
+      builder.addIfNotNull(
+          DisplayData.item("sslInvalidHostNameAllowed", sslInvalidHostNameAllowed()));
+    }
+  }
+
+  static class InfluxDBSource extends BoundedSource<String> {
+    private final Read spec;
+
+    InfluxDBSource(Read read) {
+      this.spec = read;
+    }
+
+    @Override
+    public long getEstimatedSizeBytes(PipelineOptions pipelineOptions) {
+      String noOfBlocks = "NUMBER OF BLOCKS";
+      String sizeOfBlocks = "SIZE OF BLOCKS";
+      LinkedHashSet<Long> noOfBlocksValue = new LinkedHashSet<>();
+      LinkedHashSet<Long> sizeOfBlocksValue = new LinkedHashSet<>();
+      try (InfluxDB connection =
+          getConnection(
+              spec.dataSourceConfiguration(),
+              spec.sslInvalidHostNameAllowed(),
+              spec.sslEnabled())) {
+        String query = spec.query();
+        if (query == null) {
+          query =
+              String.format(
+                  "SELECT * FROM %s.%s", spec.retentionPolicy(), String.join(",", spec.metrics()));
+        }
+        QueryResult result = connection.query(new Query(query, spec.database()));
+        List<Result> results = result.getResults();
+        for (Result res : results) {
+          for (Series series : res.getSeries()) {
+            for (List<Object> data : series.getValues()) {
+              String s = data.get(0).toString();
+              if (s.startsWith(noOfBlocks)) {
+                noOfBlocksValue.add(Long.parseLong(s.split(":", -1)[1].trim()));
+              }
+              if (s.startsWith(sizeOfBlocks)) {
+                sizeOfBlocksValue.add(Long.parseLong(s.split(":", -1)[1].trim()));
+              }
+            }
+          }
+        }
+      }
+
+      Iterator<Long> noOfBlocksValueItr = noOfBlocksValue.iterator();
+      Iterator<Long> sizeOfBlocksValueItr = sizeOfBlocksValue.iterator();
+      long size = 0;
+      while (noOfBlocksValueItr.hasNext() && sizeOfBlocksValueItr.hasNext()) {
+        size = size + (noOfBlocksValueItr.next() * sizeOfBlocksValueItr.next());
+      }
+      return size;
+    }
+
+    @Override
+    public List<? extends BoundedSource<String>> split(
+        long desiredElementsInABundle, PipelineOptions options) {
+      List<ShardInformation> shardInfo =
+          getDBShardedInformation(
+              spec.database(),
+              spec.dataSourceConfiguration(),
+              spec.sslInvalidHostNameAllowed(),
+              spec.sslEnabled());
+      List<BoundedSource<String>> sources = new ArrayList<>();
+      if (spec.query() == null) {
+        for (ShardInformation sInfo : shardInfo) {
+          if (sInfo.getStartTime().compareTo(spec.startDateTime()) > 0) {
+            sources.add(
+                new InfluxDBSource(
+                    spec.withMetrics(spec.metrics())
+                        .withRetentionPolicy(sInfo.getRetentionPolicy())
+                        .withToDateTime(sInfo.getStartTime())
+                        .withFromDateTime(sInfo.getEndTime())));
+          }
+        }
+      } else {
+        sources.add(this);
+      }
+      return sources;
+    }
+
+    @Override
+    public BoundedReader<String> createReader(PipelineOptions pipelineOptions) {
+      return new BoundedInfluxDbReader(this);
+    }
+
+    @Override
+    public void validate() {
+      spec.validate(null /* input */);
+    }
+
+    @Override
+    public void populateDisplayData(DisplayData.Builder builder) {
+      spec.populateDisplayData(builder);
+    }
+
+    @Override
+    public Coder<String> getOutputCoder() {
+      return StringUtf8Coder.of();
+    }
+  }
+
+  private static String getQueryToRun(Read spec) {
+    if (spec.query() == null) {
+      if (spec.toDateTime() != null && spec.fromDateTime() != null) {
+        return String.format(
+            "SELECT * FROM %s.%s WHERE time >= '%s' and time <= '%s'",
+            spec.retentionPolicy(),
+            String.join(",", spec.metrics()),
+            spec.toDateTime(),
+            spec.fromDateTime());
+      } else {
+        return String.format(
+            "SELECT * FROM %s.%s", spec.retentionPolicy(), String.join(",", spec.metrics()));
+      }
+    }
+    return spec.query();
+  }
+
+  private static class BoundedInfluxDbReader extends BoundedSource.BoundedReader<String> {
+    private final InfluxDBIO.InfluxDBSource source;
+    private Iterator<Result> resultIterator;
+    private Iterator<Series> seriesIterator;
+    private Iterator<List<Object>> valuesIterator;
+    private List current;
+
+    public BoundedInfluxDbReader(InfluxDBIO.InfluxDBSource source) {
+      this.source = source;
+    }
+
+    @Override
+    public boolean start() {
+      InfluxDBIO.Read spec = source.spec;
+      try (InfluxDB influxDB =
+          getConnection(
+              spec.dataSourceConfiguration(),
+              spec.sslInvalidHostNameAllowed(),
+              spec.sslEnabled())) {
+        if (spec.database() != null) {
+          influxDB.setDatabase(spec.database());
+        }
+        if (spec.retentionPolicy() != null) {
+          influxDB.setRetentionPolicy(spec.retentionPolicy());
+        }
+        String query = getQueryToRun(spec);
+        QueryResult queryResult = influxDB.query(new Query(query, spec.database()));
+        resultIterator = queryResult.getResults().iterator();
+        if (resultIterator.hasNext()) {
+          seriesIterator = resultIterator.next().getSeries().iterator();
+        }
+        if (seriesIterator.hasNext()) {
+          valuesIterator = seriesIterator.next().getValues().iterator();
+        }
+      }
+      return advance();
+    }
+
+    @Override
+    public boolean advance() {
+      if (valuesIterator.hasNext()) {
+        current = valuesIterator.next();
+        return true;
+      } else if (seriesIterator.hasNext()) {
+        valuesIterator = seriesIterator.next().getValues().iterator();
+        current = valuesIterator.next();
+        return true;
+      } else if (resultIterator.hasNext()) {
+        seriesIterator = resultIterator.next().getSeries().iterator();
+        valuesIterator = seriesIterator.next().getValues().iterator();
+        current = valuesIterator.next();
+        return true;
+      } else {
+        return false;
+      }
+    }
+
+    @Override
+    public BoundedSource getCurrentSource() {
+      return source;
+    }
+
+    @Override
+    public String getCurrent() {
+      return current.toString();
+    }
+
+    @Override
+    public void close() {}
+  }
+
+  @AutoValue
+  public abstract static class Write extends PTransform<PCollection<String>, PDone> {
+
+    @Override
+    public PDone expand(PCollection<String> input) {
+      checkArgument(dataSourceConfiguration() != null, "withConfiguration() is required");
+      checkArgument(database() != null && !database().isEmpty(), "withDatabase() is required");
+      checkArgument(
+          checkDatabase(
+              database(), dataSourceConfiguration(), sslInvalidHostNameAllowed(), sslEnabled()),
+          "Database %s does not exist",
+          database());
+      input.apply(ParDo.of(new InfluxWriterFn(this)));
+      return PDone.in(input.getPipeline());
+    }
+
+    @Override
+    public void populateDisplayData(DisplayData.Builder builder) {
+      super.populateDisplayData(builder);
+      builder.addIfNotNull(
+          DisplayData.item("dataSourceConfiguration", dataSourceConfiguration().toString()));
+      builder.addIfNotNull(DisplayData.item("database", database()));
+      builder.addIfNotNull(DisplayData.item("retentionPolicy", retentionPolicy()));
+      builder.addIfNotNull(DisplayData.item("sslEnabled", sslEnabled()));
+      builder.addIfNotNull(
+          DisplayData.item("sslInvalidHostNameAllowed", sslInvalidHostNameAllowed()));
+      builder.addIfNotNull(DisplayData.item("noOfElementsToBatch", noOfElementsToBatch()));
+      builder.addIfNotNull(DisplayData.item("flushDuration", flushDuration()));
+    }
+
+    @Nullable
+    abstract String database();
+
+    @Nullable
+    abstract String retentionPolicy();
+
+    abstract boolean sslInvalidHostNameAllowed();
+
+    abstract boolean sslEnabled();
+
+    abstract int noOfElementsToBatch();
+
+    abstract int flushDuration();
+
+    @Nullable
+    abstract DataSourceConfiguration dataSourceConfiguration();
+
+    abstract Builder builder();
+
+    @AutoValue.Builder
+    abstract static class Builder {
+      abstract Builder setDataSourceConfiguration(DataSourceConfiguration configuration);
+
+      abstract Builder setDatabase(String database);
+
+      abstract Builder setSslInvalidHostNameAllowed(boolean value);
+
+      abstract Builder setNoOfElementsToBatch(int noOfElementsToBatch);
+
+      abstract Builder setFlushDuration(int flushDuration);
+
+      abstract Builder setSslEnabled(boolean sslEnabled);
+
+      abstract Builder setRetentionPolicy(String retentionPolicy);
+
+      abstract Write build();
+    }
+
+    public Write withConfiguration(DataSourceConfiguration configuration) {
+      checkArgument(configuration != null, "configuration can not be null");
+      return builder().setDataSourceConfiguration(configuration).build();
+    }
+
+    public Write withDatabase(String database) {
+      return builder().setDatabase(database).build();
+    }
+
+    public Write withSslEnabled(boolean sslEnabled) {
+      return builder().setSslEnabled(sslEnabled).build();
+    }
+
+    public Write withSslInvalidHostNameAllowed(boolean value) {
+      return builder().setSslInvalidHostNameAllowed(value).build();
+    }
+
+    public Write withNoOfElementsToBatch(int noOfElementsToBatch) {
+      return builder().setNoOfElementsToBatch(noOfElementsToBatch).build();
+    }
+
+    public Write withFlushDuration(int flushDuration) {
+      return builder().setFlushDuration(flushDuration).build();
+    }
+
+    public Write withRetentionPolicy(String rp) {
+      return builder().setRetentionPolicy(rp).build();
+    }
+
+    private class InfluxWriterFn<T> extends DoFn<T, Void> {
+
+      private final Write spec;
+      private InfluxDB connection;
+
+      InfluxWriterFn(Write write) {
+        this.spec = write;
+      }
+
+      @Setup
+      public void setup() {
+        connection =
+            getConnection(
+                spec.dataSourceConfiguration(), sslInvalidHostNameAllowed(), sslEnabled());
+        int flushDuration = spec.flushDuration();
+        int noOfBatchPoints = spec.noOfElementsToBatch();
+        connection.enableBatch(
+            BatchOptions.DEFAULTS.actions(noOfBatchPoints).flushDuration(flushDuration));
+        connection.setRetentionPolicy(spec.retentionPolicy());
+        connection.setDatabase(spec.database());
+      }
+
+      @ProcessElement
+      public void processElement(ProcessContext c) {
+        connection.write(c.element().toString());
+      }
+
+      @FinishBundle
+      public void finishBundle() {
+        connection.flush();
+      }
+
+      @Teardown
+      public void tearDown() {
+        if (connection != null) {
+          connection.flush();
+          connection.close();
+          connection = null;
+        }
+      }
+
+      @Override
+      public void populateDisplayData(DisplayData.Builder builder) {
+        builder.delegate(Write.this);
+      }
+    }
+  }
+
+  private static OkHttpClient.Builder getUnsafeOkHttpClient() {
+    try {
+      // Create a trust manager that does not validate certificate chains
+      final TrustManager[] trustAllCerts =
+          new TrustManager[] {
+            new X509TrustManager() {
+              @Override
+              public void checkClientTrusted(
+                  java.security.cert.X509Certificate[] chain, String authType) {}
+
+              @Override
+              public void checkServerTrusted(
+                  java.security.cert.X509Certificate[] chain, String authType) {}
+
+              @Override
+              public java.security.cert.X509Certificate[] getAcceptedIssuers() {
+                return new java.security.cert.X509Certificate[] {};
+              }
+            }
+          };
+
+      // Install the all-trusting trust manager
+      final SSLContext sslContext = SSLContext.getInstance("SSL");
+      sslContext.init(null, trustAllCerts, new java.security.SecureRandom());
+      // Create an ssl socket factory with our all-trusting manager
+      final SSLSocketFactory sslSocketFactory = sslContext.getSocketFactory();
+
+      OkHttpClient.Builder builder = new OkHttpClient.Builder();
+      builder.sslSocketFactory(sslSocketFactory, (X509TrustManager) trustAllCerts[0]);
+      builder.hostnameVerifier((hostname, session) -> true);
+      return builder;
+    } catch (Exception e) {
+      throw new RuntimeException(e);
+    }
+  }
+  /** A POJO describing a DataSourceConfiguration such as URL, userName and password. */
+  @AutoValue
+  public abstract static class DataSourceConfiguration implements Serializable {
+
+    @Nullable
+    abstract ValueProvider<String> url();
+
+    @Nullable
+    abstract ValueProvider<String> userName();
+
+    @Nullable
+    abstract ValueProvider<String> password();
+
+    abstract Builder builder();
+
+    @AutoValue.Builder
+    abstract static class Builder {
+
+      abstract Builder setUrl(ValueProvider<String> url);
+
+      abstract Builder setUserName(ValueProvider<String> userName);
+
+      abstract Builder setPassword(ValueProvider<String> password);
+
+      abstract DataSourceConfiguration build();
+    }
+
+    public static DataSourceConfiguration create(String url, String userName, String password) {
+      checkArgument(url != null, "url can not be null");
+      checkArgument(userName != null, "userName can not be null");
+      checkArgument(password != null, "password can not be null");
+
+      return create(
+          ValueProvider.StaticValueProvider.of(url),
+          ValueProvider.StaticValueProvider.of(userName),
+          ValueProvider.StaticValueProvider.of(password));
+    }
+
+    public static DataSourceConfiguration create(
+        ValueProvider<String> url, ValueProvider<String> userName, ValueProvider<String> password) {
+      checkArgument(url != null, "url can not be null");
+      checkArgument(userName != null, "userName can not be null");
+      checkArgument(password != null, "password can not be null");
+
+      return new AutoValue_InfluxDBIO_DataSourceConfiguration.Builder()
+          .setUrl(url)
+          .setUserName(userName)
+          .setPassword(password)
+          .build();
+    }
+
+    public DataSourceConfiguration withUsername(String userName) {
+      return withUsername(ValueProvider.StaticValueProvider.of(userName));
+    }
+
+    public DataSourceConfiguration withUsername(ValueProvider<String> userName) {
+      return builder().setUserName(userName).build();
+    }
+
+    public DataSourceConfiguration withPassword(String password) {
+      return withPassword(ValueProvider.StaticValueProvider.of(password));
+    }
+
+    public DataSourceConfiguration withPassword(ValueProvider<String> password) {
+      return builder().setPassword(password).build();
+    }
+
+    public DataSourceConfiguration withUrl(String url) {
+      return withPassword(ValueProvider.StaticValueProvider.of(url));
+    }
+
+    public DataSourceConfiguration withUrl(ValueProvider<String> url) {
+      return builder().setPassword(url).build();
+    }
+
+    void populateDisplayData(DisplayData.Builder builder) {
+
+      builder.addIfNotNull(DisplayData.item("url", url()));
+      builder.addIfNotNull(DisplayData.item("userName", userName()));
+      builder.addIfNotNull(DisplayData.item("password", password()));
+    }
+  }
+
+  private static class DataSourceProviderFromDataSourceConfiguration
+      implements SerializableFunction<Void, DataSourceConfiguration>, HasDisplayData {
+    private final DataSourceConfiguration config;
+    private static DataSourceProviderFromDataSourceConfiguration instance;
+
+    private DataSourceProviderFromDataSourceConfiguration(DataSourceConfiguration config) {
+      this.config = config;
+    }
+
+    public static SerializableFunction<Void, DataSourceConfiguration> of(
+        DataSourceConfiguration config) {
+      if (instance == null) {
+        instance = new DataSourceProviderFromDataSourceConfiguration(config);
+      }
+      return instance;
+    }
+
+    @Override
+    public void populateDisplayData(DisplayData.Builder builder) {
+      config.populateDisplayData(builder);
+    }
+
+    @Override
+    public DataSourceConfiguration apply(Void input) {
+      return config;
+    }
+  }
+
+  private static List<ShardInformation> getDBShardedInformation(
+      String database,
+      DataSourceConfiguration configuration,
+      boolean sslInvalidHostNameAllowed,
+      boolean sslEnabled) {
+    String query = "show shards";
+    DBShardInformation dbInfo = new DBShardInformation();
+    try (InfluxDB connection =
+        getConnection(configuration, sslInvalidHostNameAllowed, sslEnabled)) {
+      QueryResult result = connection.query(new Query(query));

Review comment:
       Do we to handle for every `connection.query()` an empty result  (if possible) or any exceptions if they can happen? 

##########
File path: sdks/java/io/influxdb/src/main/java/org/apache/beam/sdk/io/influxdb/InfluxDBIO.java
##########
@@ -0,0 +1,829 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.apache.beam.sdk.io.influxdb;
+
+import static org.apache.beam.vendor.guava.v26_0_jre.com.google.common.base.Preconditions.checkArgument;
+import static org.influxdb.BatchOptions.DEFAULT_BATCH_INTERVAL_DURATION;
+import static org.influxdb.BatchOptions.DEFAULT_BUFFER_LIMIT;
+
+import com.google.auto.value.AutoValue;
+import java.io.Serializable;
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.Collections;
+import java.util.Iterator;
+import java.util.LinkedHashSet;
+import java.util.List;
+import javax.annotation.Nullable;
+import javax.net.ssl.SSLContext;
+import javax.net.ssl.SSLSocketFactory;
+import javax.net.ssl.TrustManager;
+import javax.net.ssl.X509TrustManager;
+import okhttp3.OkHttpClient;
+import org.apache.beam.sdk.annotations.Experimental;
+import org.apache.beam.sdk.coders.Coder;
+import org.apache.beam.sdk.coders.StringUtf8Coder;
+import org.apache.beam.sdk.io.BoundedSource;
+import org.apache.beam.sdk.options.PipelineOptions;
+import org.apache.beam.sdk.options.ValueProvider;
+import org.apache.beam.sdk.transforms.DoFn;
+import org.apache.beam.sdk.transforms.PTransform;
+import org.apache.beam.sdk.transforms.ParDo;
+import org.apache.beam.sdk.transforms.SerializableFunction;
+import org.apache.beam.sdk.transforms.display.DisplayData;
+import org.apache.beam.sdk.transforms.display.HasDisplayData;
+import org.apache.beam.sdk.values.PBegin;
+import org.apache.beam.sdk.values.PCollection;
+import org.apache.beam.sdk.values.PDone;
+import org.influxdb.BatchOptions;
+import org.influxdb.InfluxDB;
+import org.influxdb.InfluxDBFactory;
+import org.influxdb.dto.Query;
+import org.influxdb.dto.QueryResult;
+import org.influxdb.dto.QueryResult.Result;
+import org.influxdb.dto.QueryResult.Series;
+import org.joda.time.DateTime;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+/**
+ * IO to read and write to InfluxDB.
+ *
+ * <h3>Reading from InfluxDB</h3>
+ *
+ * <p>InfluxDBIO {@link #read()} returns a bounded collection of {@code String} as a {@code
+ * PCollection<String>}.
+ *
+ * <p>you have to provide a {@link DataSourceConfiguration} using<br>
+ * {@link DataSourceConfiguration#create(String, String, String)}(url, userName and password).
+ * Optionally, {@link DataSourceConfiguration#withUsername(String)} and {@link
+ * DataSourceConfiguration#withPassword(String)} allows you to define userName and password.
+ *
+ * <p>For example:
+ *
+ * <pre>{@code
+ * PCollection<String> collection = pipeline.apply(InfluxDBIO.read()
+ *   .withDataSourceConfiguration(InfluxDBIO.DataSourceConfiguration.create(
+ *          "https://localhost:8086","userName","password"))
+ *   .withDatabase("metrics")
+ *   .withRetentionPolicy("autogen")
+ *   .withSslInvalidHostNameAllowed(true)
+ *   .withSslEnabled(true));
+ * }</pre>
+ *
+ * <p>Read with query example:
+ *
+ * <pre>{@code
+ * PCollection<String> collection = pipeline.apply(InfluxDBIO.read()
+ *   .withDataSourceConfiguration(InfluxDBIO.DataSourceConfiguration.create(
+ *          "https://localhost:8086","userName","password"))
+ *   .withDatabase("metrics")
+ *   .withQuery("SELECT * FROM CPU")
+ *   .withRetentionPolicy("autogen")
+ *   .withSslInvalidHostNameAllowed(true)
+ *   .withSslEnabled(true));
+ * }</pre>
+ *
+ * <h3>Writing to InfluxDB </h3>
+ *
+ * <p>InfluxDB sink supports writing records into a database. It writes a {@link PCollection} to the
+ * database by converting each T. The T should implement getLineProtocol() from {@link
+ * LineProtocolConvertable}.
+ *
+ * <p>Like the {@link #read()}, to configure the {@link #write()}, you have to provide a {@link
+ * DataSourceConfiguration}.
+ *
+ * <pre>{@code
+ * pipeline
+ *   .apply(...)
+ *   .apply(InfluxDb.write()
+ *      .withDataSourceConfiguration(InfluxDBIO.DataSourceConfiguration.create(
+ *            "https://localhost:8086","userName","password"))
+ *   .withRetentionPolicy("autogen")
+ *   .withDatabase("metrics")
+ *   .withSslInvalidHostNameAllowed(true)
+ *   .withSslEnabled(true));
+ *    );
+ * }</pre>
+ *
+ * *
+ */
+@Experimental(Experimental.Kind.SOURCE_SINK)
+public class InfluxDBIO {
+  private static final Logger LOG = LoggerFactory.getLogger(InfluxDBIO.class);
+
+  public static Write write() {
+    return new AutoValue_InfluxDBIO_Write.Builder()
+        .setSslEnabled(false)
+        .setSslInvalidHostNameAllowed(false)
+        .setFlushDuration(DEFAULT_BATCH_INTERVAL_DURATION)
+        .setNoOfElementsToBatch(DEFAULT_BUFFER_LIMIT)
+        .build();
+  }
+
+  public static Read read() {
+    return new AutoValue_InfluxDBIO_Read.Builder()
+        .setSslEnabled(false)
+        .setSslInvalidHostNameAllowed(false)
+        .setStartDateTime(DateTime.parse("1677-09-21T00:12:43.145224194Z"))
+        .setEndDateTime(DateTime.parse("2262-04-11T23:47:16.854775806Z"))
+        .setRetentionPolicy("autogen")
+        .build();
+  }
+
+  @AutoValue
+  public abstract static class Read extends PTransform<PBegin, PCollection<String>> {
+
+    abstract boolean sslInvalidHostNameAllowed();
+
+    abstract String retentionPolicy();
+
+    @Nullable
+    abstract String database();
+
+    @Nullable
+    abstract String query();
+
+    abstract boolean sslEnabled();
+
+    @Nullable
+    abstract DataSourceConfiguration dataSourceConfiguration();
+
+    @Nullable
+    abstract List<String> metrics();
+
+    abstract DateTime startDateTime();
+
+    abstract DateTime endDateTime();
+
+    @Nullable
+    abstract DateTime fromDateTime();
+
+    @Nullable
+    abstract DateTime toDateTime();
+
+    abstract Builder builder();
+
+    @AutoValue.Builder
+    abstract static class Builder {
+      abstract Builder setDataSourceConfiguration(DataSourceConfiguration configuration);
+
+      abstract Builder setDatabase(String database);
+
+      abstract Builder setSslInvalidHostNameAllowed(boolean value);
+
+      abstract Builder setRetentionPolicy(String retentionPolicy);
+
+      abstract Builder setQuery(String query);
+
+      abstract Builder setToDateTime(DateTime toDateTime);
+
+      abstract Builder setFromDateTime(DateTime fromDateTime);
+
+      abstract Builder setStartDateTime(DateTime startDateTime);
+
+      abstract Builder setEndDateTime(DateTime endDateTime);
+
+      abstract Builder setSslEnabled(boolean sslEnabled);
+
+      abstract Builder setMetrics(List<String> metrics);
+
+      abstract Read build();
+    }
+
+    /** Reads from the InfluxDB instance indicated by the given configuration. */
+    public Read withDataSourceConfiguration(DataSourceConfiguration configuration) {
+      checkArgument(configuration != null, "configuration can not be null");
+      return builder().setDataSourceConfiguration(configuration).build();
+    }
+
+    /** Reads from the specified database. */
+    public Read withDatabase(String database) {
+      return builder()
+          .setDatabase(database)
+          .setDataSourceConfiguration(dataSourceConfiguration())
+          .build();
+    }
+
+    public Read withToDateTime(DateTime toDateTime) {
+      return builder().setToDateTime(toDateTime).build();
+    }
+
+    public Read withFromDateTime(DateTime fromDateTime) {
+      return builder().setFromDateTime(fromDateTime).build();
+    }
+
+    public Read withStartDateTime(DateTime startDateTime) {
+      return builder().setStartDateTime(startDateTime).build();
+    }
+
+    public Read withEndDateTime(DateTime endDateTime) {
+      return builder().setEndDateTime(endDateTime).build();
+    }
+
+    public Read withMetrics(List<String> metrics) {
+      return builder().setMetrics(metrics).build();
+    }
+
+    public Read withMetrics(String... metrics) {
+      return withMetrics(Arrays.asList(metrics));
+    }
+
+    public Read withSslEnabled(boolean sslEnabled) {
+      return builder().setSslEnabled(sslEnabled).build();
+    }
+
+    public Read withSslInvalidHostNameAllowed(boolean value) {
+      return builder().setSslInvalidHostNameAllowed(value).build();
+    }
+
+    public Read withRetentionPolicy(String retentionPolicy) {
+      return builder().setRetentionPolicy(retentionPolicy).build();
+    }
+
+    public Read withQuery(String query) {
+      return builder().setQuery(query).build();
+    }
+
+    @Override
+    public PCollection<String> expand(PBegin input) {
+      checkArgument(dataSourceConfiguration() != null, "configuration is required");
+      checkArgument(query() != null || database() != null, "database or query is required");
+      if (database() != null) {
+        checkArgument(
+            checkDatabase(
+                database(), dataSourceConfiguration(), sslInvalidHostNameAllowed(), sslEnabled()),
+            "Database %s does not exist",
+            database());
+      }
+      return input.apply(org.apache.beam.sdk.io.Read.from(new InfluxDBSource(this)));
+    }
+
+    @Override
+    public void populateDisplayData(DisplayData.Builder builder) {
+      super.populateDisplayData(builder);
+      builder.addIfNotNull(
+          DisplayData.item("dataSourceConfiguration", dataSourceConfiguration().toString()));
+      builder.addIfNotNull(DisplayData.item("database", database()));
+      builder.addIfNotNull(DisplayData.item("retentionPolicy", retentionPolicy()));
+      builder.addIfNotNull(DisplayData.item("sslEnabled", sslEnabled()));
+      builder.addIfNotNull(DisplayData.item("query", query()));
+      builder.addIfNotNull(
+          DisplayData.item("sslInvalidHostNameAllowed", sslInvalidHostNameAllowed()));
+    }
+  }
+
+  static class InfluxDBSource extends BoundedSource<String> {
+    private final Read spec;
+
+    InfluxDBSource(Read read) {
+      this.spec = read;
+    }
+
+    @Override
+    public long getEstimatedSizeBytes(PipelineOptions pipelineOptions) {
+      String noOfBlocks = "NUMBER OF BLOCKS";
+      String sizeOfBlocks = "SIZE OF BLOCKS";
+      LinkedHashSet<Long> noOfBlocksValue = new LinkedHashSet<>();
+      LinkedHashSet<Long> sizeOfBlocksValue = new LinkedHashSet<>();
+      try (InfluxDB connection =
+          getConnection(
+              spec.dataSourceConfiguration(),
+              spec.sslInvalidHostNameAllowed(),
+              spec.sslEnabled())) {
+        String query = spec.query();
+        if (query == null) {
+          query =
+              String.format(
+                  "SELECT * FROM %s.%s", spec.retentionPolicy(), String.join(",", spec.metrics()));
+        }
+        QueryResult result = connection.query(new Query(query, spec.database()));
+        List<Result> results = result.getResults();
+        for (Result res : results) {
+          for (Series series : res.getSeries()) {
+            for (List<Object> data : series.getValues()) {
+              String s = data.get(0).toString();
+              if (s.startsWith(noOfBlocks)) {
+                noOfBlocksValue.add(Long.parseLong(s.split(":", -1)[1].trim()));
+              }
+              if (s.startsWith(sizeOfBlocks)) {
+                sizeOfBlocksValue.add(Long.parseLong(s.split(":", -1)[1].trim()));
+              }
+            }
+          }
+        }
+      }
+
+      Iterator<Long> noOfBlocksValueItr = noOfBlocksValue.iterator();
+      Iterator<Long> sizeOfBlocksValueItr = sizeOfBlocksValue.iterator();
+      long size = 0;
+      while (noOfBlocksValueItr.hasNext() && sizeOfBlocksValueItr.hasNext()) {
+        size = size + (noOfBlocksValueItr.next() * sizeOfBlocksValueItr.next());
+      }
+      return size;
+    }
+
+    @Override
+    public List<? extends BoundedSource<String>> split(
+        long desiredElementsInABundle, PipelineOptions options) {
+      List<ShardInformation> shardInfo =
+          getDBShardedInformation(
+              spec.database(),
+              spec.dataSourceConfiguration(),
+              spec.sslInvalidHostNameAllowed(),
+              spec.sslEnabled());
+      List<BoundedSource<String>> sources = new ArrayList<>();
+      if (spec.query() == null) {
+        for (ShardInformation sInfo : shardInfo) {
+          if (sInfo.getStartTime().compareTo(spec.startDateTime()) > 0) {
+            sources.add(
+                new InfluxDBSource(
+                    spec.withMetrics(spec.metrics())
+                        .withRetentionPolicy(sInfo.getRetentionPolicy())
+                        .withToDateTime(sInfo.getStartTime())
+                        .withFromDateTime(sInfo.getEndTime())));
+          }
+        }
+      } else {
+        sources.add(this);
+      }
+      return sources;
+    }
+
+    @Override
+    public BoundedReader<String> createReader(PipelineOptions pipelineOptions) {
+      return new BoundedInfluxDbReader(this);
+    }
+
+    @Override
+    public void validate() {
+      spec.validate(null /* input */);
+    }
+
+    @Override
+    public void populateDisplayData(DisplayData.Builder builder) {
+      spec.populateDisplayData(builder);
+    }
+
+    @Override
+    public Coder<String> getOutputCoder() {
+      return StringUtf8Coder.of();
+    }
+  }
+
+  private static String getQueryToRun(Read spec) {
+    if (spec.query() == null) {
+      if (spec.toDateTime() != null && spec.fromDateTime() != null) {
+        return String.format(
+            "SELECT * FROM %s.%s WHERE time >= '%s' and time <= '%s'",
+            spec.retentionPolicy(),
+            String.join(",", spec.metrics()),
+            spec.toDateTime(),
+            spec.fromDateTime());
+      } else {
+        return String.format(
+            "SELECT * FROM %s.%s", spec.retentionPolicy(), String.join(",", spec.metrics()));
+      }
+    }
+    return spec.query();
+  }
+
+  private static class BoundedInfluxDbReader extends BoundedSource.BoundedReader<String> {
+    private final InfluxDBIO.InfluxDBSource source;
+    private Iterator<Result> resultIterator;
+    private Iterator<Series> seriesIterator;
+    private Iterator<List<Object>> valuesIterator;
+    private List current;
+
+    public BoundedInfluxDbReader(InfluxDBIO.InfluxDBSource source) {
+      this.source = source;
+    }
+
+    @Override
+    public boolean start() {
+      InfluxDBIO.Read spec = source.spec;
+      try (InfluxDB influxDB =
+          getConnection(
+              spec.dataSourceConfiguration(),
+              spec.sslInvalidHostNameAllowed(),
+              spec.sslEnabled())) {
+        if (spec.database() != null) {
+          influxDB.setDatabase(spec.database());
+        }
+        if (spec.retentionPolicy() != null) {
+          influxDB.setRetentionPolicy(spec.retentionPolicy());
+        }
+        String query = getQueryToRun(spec);
+        QueryResult queryResult = influxDB.query(new Query(query, spec.database()));
+        resultIterator = queryResult.getResults().iterator();
+        if (resultIterator.hasNext()) {
+          seriesIterator = resultIterator.next().getSeries().iterator();
+        }
+        if (seriesIterator.hasNext()) {
+          valuesIterator = seriesIterator.next().getValues().iterator();
+        }
+      }
+      return advance();
+    }
+
+    @Override
+    public boolean advance() {
+      if (valuesIterator.hasNext()) {
+        current = valuesIterator.next();
+        return true;
+      } else if (seriesIterator.hasNext()) {
+        valuesIterator = seriesIterator.next().getValues().iterator();
+        current = valuesIterator.next();
+        return true;
+      } else if (resultIterator.hasNext()) {
+        seriesIterator = resultIterator.next().getSeries().iterator();
+        valuesIterator = seriesIterator.next().getValues().iterator();
+        current = valuesIterator.next();
+        return true;
+      } else {
+        return false;
+      }
+    }
+
+    @Override
+    public BoundedSource getCurrentSource() {
+      return source;
+    }
+
+    @Override
+    public String getCurrent() {
+      return current.toString();
+    }
+
+    @Override
+    public void close() {}
+  }
+
+  @AutoValue
+  public abstract static class Write extends PTransform<PCollection<String>, PDone> {
+
+    @Override
+    public PDone expand(PCollection<String> input) {
+      checkArgument(dataSourceConfiguration() != null, "withConfiguration() is required");
+      checkArgument(database() != null && !database().isEmpty(), "withDatabase() is required");
+      checkArgument(
+          checkDatabase(
+              database(), dataSourceConfiguration(), sslInvalidHostNameAllowed(), sslEnabled()),
+          "Database %s does not exist",
+          database());
+      input.apply(ParDo.of(new InfluxWriterFn(this)));
+      return PDone.in(input.getPipeline());
+    }
+
+    @Override
+    public void populateDisplayData(DisplayData.Builder builder) {
+      super.populateDisplayData(builder);
+      builder.addIfNotNull(
+          DisplayData.item("dataSourceConfiguration", dataSourceConfiguration().toString()));
+      builder.addIfNotNull(DisplayData.item("database", database()));
+      builder.addIfNotNull(DisplayData.item("retentionPolicy", retentionPolicy()));
+      builder.addIfNotNull(DisplayData.item("sslEnabled", sslEnabled()));
+      builder.addIfNotNull(
+          DisplayData.item("sslInvalidHostNameAllowed", sslInvalidHostNameAllowed()));
+      builder.addIfNotNull(DisplayData.item("noOfElementsToBatch", noOfElementsToBatch()));
+      builder.addIfNotNull(DisplayData.item("flushDuration", flushDuration()));
+    }
+
+    @Nullable
+    abstract String database();
+
+    @Nullable
+    abstract String retentionPolicy();
+
+    abstract boolean sslInvalidHostNameAllowed();
+
+    abstract boolean sslEnabled();
+
+    abstract int noOfElementsToBatch();
+
+    abstract int flushDuration();
+
+    @Nullable
+    abstract DataSourceConfiguration dataSourceConfiguration();
+
+    abstract Builder builder();
+
+    @AutoValue.Builder
+    abstract static class Builder {
+      abstract Builder setDataSourceConfiguration(DataSourceConfiguration configuration);
+
+      abstract Builder setDatabase(String database);
+
+      abstract Builder setSslInvalidHostNameAllowed(boolean value);
+
+      abstract Builder setNoOfElementsToBatch(int noOfElementsToBatch);
+
+      abstract Builder setFlushDuration(int flushDuration);
+
+      abstract Builder setSslEnabled(boolean sslEnabled);
+
+      abstract Builder setRetentionPolicy(String retentionPolicy);
+
+      abstract Write build();
+    }
+
+    public Write withConfiguration(DataSourceConfiguration configuration) {
+      checkArgument(configuration != null, "configuration can not be null");
+      return builder().setDataSourceConfiguration(configuration).build();
+    }
+
+    public Write withDatabase(String database) {
+      return builder().setDatabase(database).build();
+    }
+
+    public Write withSslEnabled(boolean sslEnabled) {
+      return builder().setSslEnabled(sslEnabled).build();
+    }
+
+    public Write withSslInvalidHostNameAllowed(boolean value) {
+      return builder().setSslInvalidHostNameAllowed(value).build();
+    }
+
+    public Write withNoOfElementsToBatch(int noOfElementsToBatch) {

Review comment:
       Is it needed to allow user to configure this? Can we set just sufficient default value?

##########
File path: sdks/java/io/influxdb/src/main/java/org/apache/beam/sdk/io/influxdb/InfluxDBIO.java
##########
@@ -0,0 +1,829 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.apache.beam.sdk.io.influxdb;
+
+import static org.apache.beam.vendor.guava.v26_0_jre.com.google.common.base.Preconditions.checkArgument;
+import static org.influxdb.BatchOptions.DEFAULT_BATCH_INTERVAL_DURATION;
+import static org.influxdb.BatchOptions.DEFAULT_BUFFER_LIMIT;
+
+import com.google.auto.value.AutoValue;
+import java.io.Serializable;
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.Collections;
+import java.util.Iterator;
+import java.util.LinkedHashSet;
+import java.util.List;
+import javax.annotation.Nullable;
+import javax.net.ssl.SSLContext;
+import javax.net.ssl.SSLSocketFactory;
+import javax.net.ssl.TrustManager;
+import javax.net.ssl.X509TrustManager;
+import okhttp3.OkHttpClient;
+import org.apache.beam.sdk.annotations.Experimental;
+import org.apache.beam.sdk.coders.Coder;
+import org.apache.beam.sdk.coders.StringUtf8Coder;
+import org.apache.beam.sdk.io.BoundedSource;
+import org.apache.beam.sdk.options.PipelineOptions;
+import org.apache.beam.sdk.options.ValueProvider;
+import org.apache.beam.sdk.transforms.DoFn;
+import org.apache.beam.sdk.transforms.PTransform;
+import org.apache.beam.sdk.transforms.ParDo;
+import org.apache.beam.sdk.transforms.SerializableFunction;
+import org.apache.beam.sdk.transforms.display.DisplayData;
+import org.apache.beam.sdk.transforms.display.HasDisplayData;
+import org.apache.beam.sdk.values.PBegin;
+import org.apache.beam.sdk.values.PCollection;
+import org.apache.beam.sdk.values.PDone;
+import org.influxdb.BatchOptions;
+import org.influxdb.InfluxDB;
+import org.influxdb.InfluxDBFactory;
+import org.influxdb.dto.Query;
+import org.influxdb.dto.QueryResult;
+import org.influxdb.dto.QueryResult.Result;
+import org.influxdb.dto.QueryResult.Series;
+import org.joda.time.DateTime;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+/**
+ * IO to read and write to InfluxDB.
+ *
+ * <h3>Reading from InfluxDB</h3>
+ *
+ * <p>InfluxDBIO {@link #read()} returns a bounded collection of {@code String} as a {@code
+ * PCollection<String>}.
+ *
+ * <p>you have to provide a {@link DataSourceConfiguration} using<br>
+ * {@link DataSourceConfiguration#create(String, String, String)}(url, userName and password).
+ * Optionally, {@link DataSourceConfiguration#withUsername(String)} and {@link
+ * DataSourceConfiguration#withPassword(String)} allows you to define userName and password.
+ *
+ * <p>For example:
+ *
+ * <pre>{@code
+ * PCollection<String> collection = pipeline.apply(InfluxDBIO.read()
+ *   .withDataSourceConfiguration(InfluxDBIO.DataSourceConfiguration.create(
+ *          "https://localhost:8086","userName","password"))
+ *   .withDatabase("metrics")
+ *   .withRetentionPolicy("autogen")
+ *   .withSslInvalidHostNameAllowed(true)
+ *   .withSslEnabled(true));
+ * }</pre>
+ *
+ * <p>Read with query example:
+ *
+ * <pre>{@code
+ * PCollection<String> collection = pipeline.apply(InfluxDBIO.read()
+ *   .withDataSourceConfiguration(InfluxDBIO.DataSourceConfiguration.create(
+ *          "https://localhost:8086","userName","password"))
+ *   .withDatabase("metrics")
+ *   .withQuery("SELECT * FROM CPU")
+ *   .withRetentionPolicy("autogen")
+ *   .withSslInvalidHostNameAllowed(true)
+ *   .withSslEnabled(true));
+ * }</pre>
+ *
+ * <h3>Writing to InfluxDB </h3>
+ *
+ * <p>InfluxDB sink supports writing records into a database. It writes a {@link PCollection} to the
+ * database by converting each T. The T should implement getLineProtocol() from {@link
+ * LineProtocolConvertable}.
+ *
+ * <p>Like the {@link #read()}, to configure the {@link #write()}, you have to provide a {@link
+ * DataSourceConfiguration}.
+ *
+ * <pre>{@code
+ * pipeline
+ *   .apply(...)
+ *   .apply(InfluxDb.write()
+ *      .withDataSourceConfiguration(InfluxDBIO.DataSourceConfiguration.create(
+ *            "https://localhost:8086","userName","password"))
+ *   .withRetentionPolicy("autogen")
+ *   .withDatabase("metrics")
+ *   .withSslInvalidHostNameAllowed(true)
+ *   .withSslEnabled(true));
+ *    );
+ * }</pre>
+ *
+ * *
+ */
+@Experimental(Experimental.Kind.SOURCE_SINK)
+public class InfluxDBIO {
+  private static final Logger LOG = LoggerFactory.getLogger(InfluxDBIO.class);
+
+  public static Write write() {
+    return new AutoValue_InfluxDBIO_Write.Builder()
+        .setSslEnabled(false)
+        .setSslInvalidHostNameAllowed(false)
+        .setFlushDuration(DEFAULT_BATCH_INTERVAL_DURATION)
+        .setNoOfElementsToBatch(DEFAULT_BUFFER_LIMIT)
+        .build();
+  }
+
+  public static Read read() {
+    return new AutoValue_InfluxDBIO_Read.Builder()
+        .setSslEnabled(false)
+        .setSslInvalidHostNameAllowed(false)
+        .setStartDateTime(DateTime.parse("1677-09-21T00:12:43.145224194Z"))
+        .setEndDateTime(DateTime.parse("2262-04-11T23:47:16.854775806Z"))
+        .setRetentionPolicy("autogen")
+        .build();
+  }
+
+  @AutoValue
+  public abstract static class Read extends PTransform<PBegin, PCollection<String>> {
+
+    abstract boolean sslInvalidHostNameAllowed();
+
+    abstract String retentionPolicy();
+
+    @Nullable
+    abstract String database();
+
+    @Nullable
+    abstract String query();
+
+    abstract boolean sslEnabled();
+
+    @Nullable
+    abstract DataSourceConfiguration dataSourceConfiguration();
+
+    @Nullable
+    abstract List<String> metrics();
+
+    abstract DateTime startDateTime();
+
+    abstract DateTime endDateTime();
+
+    @Nullable
+    abstract DateTime fromDateTime();
+
+    @Nullable
+    abstract DateTime toDateTime();
+
+    abstract Builder builder();
+
+    @AutoValue.Builder
+    abstract static class Builder {
+      abstract Builder setDataSourceConfiguration(DataSourceConfiguration configuration);
+
+      abstract Builder setDatabase(String database);
+
+      abstract Builder setSslInvalidHostNameAllowed(boolean value);
+
+      abstract Builder setRetentionPolicy(String retentionPolicy);
+
+      abstract Builder setQuery(String query);
+
+      abstract Builder setToDateTime(DateTime toDateTime);
+
+      abstract Builder setFromDateTime(DateTime fromDateTime);
+
+      abstract Builder setStartDateTime(DateTime startDateTime);
+
+      abstract Builder setEndDateTime(DateTime endDateTime);
+
+      abstract Builder setSslEnabled(boolean sslEnabled);
+
+      abstract Builder setMetrics(List<String> metrics);
+
+      abstract Read build();
+    }
+
+    /** Reads from the InfluxDB instance indicated by the given configuration. */
+    public Read withDataSourceConfiguration(DataSourceConfiguration configuration) {
+      checkArgument(configuration != null, "configuration can not be null");
+      return builder().setDataSourceConfiguration(configuration).build();
+    }
+
+    /** Reads from the specified database. */
+    public Read withDatabase(String database) {
+      return builder()
+          .setDatabase(database)
+          .setDataSourceConfiguration(dataSourceConfiguration())
+          .build();
+    }
+
+    public Read withToDateTime(DateTime toDateTime) {
+      return builder().setToDateTime(toDateTime).build();
+    }
+
+    public Read withFromDateTime(DateTime fromDateTime) {
+      return builder().setFromDateTime(fromDateTime).build();
+    }
+
+    public Read withStartDateTime(DateTime startDateTime) {
+      return builder().setStartDateTime(startDateTime).build();
+    }
+
+    public Read withEndDateTime(DateTime endDateTime) {
+      return builder().setEndDateTime(endDateTime).build();
+    }
+
+    public Read withMetrics(List<String> metrics) {
+      return builder().setMetrics(metrics).build();
+    }
+
+    public Read withMetrics(String... metrics) {
+      return withMetrics(Arrays.asList(metrics));
+    }
+
+    public Read withSslEnabled(boolean sslEnabled) {
+      return builder().setSslEnabled(sslEnabled).build();
+    }
+
+    public Read withSslInvalidHostNameAllowed(boolean value) {
+      return builder().setSslInvalidHostNameAllowed(value).build();
+    }
+
+    public Read withRetentionPolicy(String retentionPolicy) {
+      return builder().setRetentionPolicy(retentionPolicy).build();
+    }
+
+    public Read withQuery(String query) {
+      return builder().setQuery(query).build();
+    }
+
+    @Override
+    public PCollection<String> expand(PBegin input) {
+      checkArgument(dataSourceConfiguration() != null, "configuration is required");
+      checkArgument(query() != null || database() != null, "database or query is required");
+      if (database() != null) {
+        checkArgument(
+            checkDatabase(
+                database(), dataSourceConfiguration(), sslInvalidHostNameAllowed(), sslEnabled()),
+            "Database %s does not exist",
+            database());
+      }
+      return input.apply(org.apache.beam.sdk.io.Read.from(new InfluxDBSource(this)));
+    }
+
+    @Override
+    public void populateDisplayData(DisplayData.Builder builder) {
+      super.populateDisplayData(builder);
+      builder.addIfNotNull(
+          DisplayData.item("dataSourceConfiguration", dataSourceConfiguration().toString()));
+      builder.addIfNotNull(DisplayData.item("database", database()));
+      builder.addIfNotNull(DisplayData.item("retentionPolicy", retentionPolicy()));
+      builder.addIfNotNull(DisplayData.item("sslEnabled", sslEnabled()));
+      builder.addIfNotNull(DisplayData.item("query", query()));
+      builder.addIfNotNull(
+          DisplayData.item("sslInvalidHostNameAllowed", sslInvalidHostNameAllowed()));
+    }
+  }
+
+  static class InfluxDBSource extends BoundedSource<String> {
+    private final Read spec;
+
+    InfluxDBSource(Read read) {
+      this.spec = read;
+    }
+
+    @Override
+    public long getEstimatedSizeBytes(PipelineOptions pipelineOptions) {
+      String noOfBlocks = "NUMBER OF BLOCKS";
+      String sizeOfBlocks = "SIZE OF BLOCKS";
+      LinkedHashSet<Long> noOfBlocksValue = new LinkedHashSet<>();
+      LinkedHashSet<Long> sizeOfBlocksValue = new LinkedHashSet<>();
+      try (InfluxDB connection =
+          getConnection(
+              spec.dataSourceConfiguration(),
+              spec.sslInvalidHostNameAllowed(),
+              spec.sslEnabled())) {
+        String query = spec.query();
+        if (query == null) {
+          query =
+              String.format(
+                  "SELECT * FROM %s.%s", spec.retentionPolicy(), String.join(",", spec.metrics()));
+        }
+        QueryResult result = connection.query(new Query(query, spec.database()));
+        List<Result> results = result.getResults();
+        for (Result res : results) {
+          for (Series series : res.getSeries()) {
+            for (List<Object> data : series.getValues()) {
+              String s = data.get(0).toString();
+              if (s.startsWith(noOfBlocks)) {
+                noOfBlocksValue.add(Long.parseLong(s.split(":", -1)[1].trim()));
+              }
+              if (s.startsWith(sizeOfBlocks)) {
+                sizeOfBlocksValue.add(Long.parseLong(s.split(":", -1)[1].trim()));
+              }
+            }
+          }
+        }
+      }
+
+      Iterator<Long> noOfBlocksValueItr = noOfBlocksValue.iterator();
+      Iterator<Long> sizeOfBlocksValueItr = sizeOfBlocksValue.iterator();
+      long size = 0;
+      while (noOfBlocksValueItr.hasNext() && sizeOfBlocksValueItr.hasNext()) {
+        size = size + (noOfBlocksValueItr.next() * sizeOfBlocksValueItr.next());
+      }
+      return size;
+    }
+
+    @Override
+    public List<? extends BoundedSource<String>> split(
+        long desiredElementsInABundle, PipelineOptions options) {
+      List<ShardInformation> shardInfo =
+          getDBShardedInformation(
+              spec.database(),
+              spec.dataSourceConfiguration(),
+              spec.sslInvalidHostNameAllowed(),
+              spec.sslEnabled());
+      List<BoundedSource<String>> sources = new ArrayList<>();
+      if (spec.query() == null) {
+        for (ShardInformation sInfo : shardInfo) {
+          if (sInfo.getStartTime().compareTo(spec.startDateTime()) > 0) {
+            sources.add(
+                new InfluxDBSource(
+                    spec.withMetrics(spec.metrics())
+                        .withRetentionPolicy(sInfo.getRetentionPolicy())
+                        .withToDateTime(sInfo.getStartTime())
+                        .withFromDateTime(sInfo.getEndTime())));
+          }
+        }
+      } else {
+        sources.add(this);
+      }
+      return sources;
+    }
+
+    @Override
+    public BoundedReader<String> createReader(PipelineOptions pipelineOptions) {
+      return new BoundedInfluxDbReader(this);
+    }
+
+    @Override
+    public void validate() {
+      spec.validate(null /* input */);
+    }
+
+    @Override
+    public void populateDisplayData(DisplayData.Builder builder) {
+      spec.populateDisplayData(builder);
+    }
+
+    @Override
+    public Coder<String> getOutputCoder() {
+      return StringUtf8Coder.of();
+    }
+  }
+
+  private static String getQueryToRun(Read spec) {
+    if (spec.query() == null) {
+      if (spec.toDateTime() != null && spec.fromDateTime() != null) {
+        return String.format(
+            "SELECT * FROM %s.%s WHERE time >= '%s' and time <= '%s'",
+            spec.retentionPolicy(),
+            String.join(",", spec.metrics()),
+            spec.toDateTime(),
+            spec.fromDateTime());
+      } else {
+        return String.format(
+            "SELECT * FROM %s.%s", spec.retentionPolicy(), String.join(",", spec.metrics()));
+      }
+    }
+    return spec.query();
+  }
+
+  private static class BoundedInfluxDbReader extends BoundedSource.BoundedReader<String> {
+    private final InfluxDBIO.InfluxDBSource source;
+    private Iterator<Result> resultIterator;
+    private Iterator<Series> seriesIterator;
+    private Iterator<List<Object>> valuesIterator;
+    private List current;
+
+    public BoundedInfluxDbReader(InfluxDBIO.InfluxDBSource source) {
+      this.source = source;
+    }
+
+    @Override
+    public boolean start() {
+      InfluxDBIO.Read spec = source.spec;
+      try (InfluxDB influxDB =
+          getConnection(
+              spec.dataSourceConfiguration(),
+              spec.sslInvalidHostNameAllowed(),
+              spec.sslEnabled())) {
+        if (spec.database() != null) {
+          influxDB.setDatabase(spec.database());
+        }
+        if (spec.retentionPolicy() != null) {
+          influxDB.setRetentionPolicy(spec.retentionPolicy());
+        }
+        String query = getQueryToRun(spec);
+        QueryResult queryResult = influxDB.query(new Query(query, spec.database()));
+        resultIterator = queryResult.getResults().iterator();
+        if (resultIterator.hasNext()) {
+          seriesIterator = resultIterator.next().getSeries().iterator();
+        }
+        if (seriesIterator.hasNext()) {
+          valuesIterator = seriesIterator.next().getValues().iterator();
+        }
+      }
+      return advance();
+    }
+
+    @Override
+    public boolean advance() {
+      if (valuesIterator.hasNext()) {
+        current = valuesIterator.next();
+        return true;
+      } else if (seriesIterator.hasNext()) {
+        valuesIterator = seriesIterator.next().getValues().iterator();
+        current = valuesIterator.next();
+        return true;
+      } else if (resultIterator.hasNext()) {
+        seriesIterator = resultIterator.next().getSeries().iterator();
+        valuesIterator = seriesIterator.next().getValues().iterator();
+        current = valuesIterator.next();
+        return true;
+      } else {
+        return false;
+      }
+    }
+
+    @Override
+    public BoundedSource getCurrentSource() {
+      return source;
+    }
+
+    @Override
+    public String getCurrent() {
+      return current.toString();
+    }
+
+    @Override
+    public void close() {}
+  }
+
+  @AutoValue
+  public abstract static class Write extends PTransform<PCollection<String>, PDone> {
+
+    @Override
+    public PDone expand(PCollection<String> input) {
+      checkArgument(dataSourceConfiguration() != null, "withConfiguration() is required");
+      checkArgument(database() != null && !database().isEmpty(), "withDatabase() is required");
+      checkArgument(
+          checkDatabase(
+              database(), dataSourceConfiguration(), sslInvalidHostNameAllowed(), sslEnabled()),
+          "Database %s does not exist",
+          database());
+      input.apply(ParDo.of(new InfluxWriterFn(this)));
+      return PDone.in(input.getPipeline());
+    }
+
+    @Override
+    public void populateDisplayData(DisplayData.Builder builder) {
+      super.populateDisplayData(builder);
+      builder.addIfNotNull(
+          DisplayData.item("dataSourceConfiguration", dataSourceConfiguration().toString()));
+      builder.addIfNotNull(DisplayData.item("database", database()));
+      builder.addIfNotNull(DisplayData.item("retentionPolicy", retentionPolicy()));
+      builder.addIfNotNull(DisplayData.item("sslEnabled", sslEnabled()));
+      builder.addIfNotNull(
+          DisplayData.item("sslInvalidHostNameAllowed", sslInvalidHostNameAllowed()));
+      builder.addIfNotNull(DisplayData.item("noOfElementsToBatch", noOfElementsToBatch()));
+      builder.addIfNotNull(DisplayData.item("flushDuration", flushDuration()));
+    }
+
+    @Nullable
+    abstract String database();
+
+    @Nullable
+    abstract String retentionPolicy();
+
+    abstract boolean sslInvalidHostNameAllowed();
+
+    abstract boolean sslEnabled();
+
+    abstract int noOfElementsToBatch();
+
+    abstract int flushDuration();
+
+    @Nullable
+    abstract DataSourceConfiguration dataSourceConfiguration();
+
+    abstract Builder builder();
+
+    @AutoValue.Builder
+    abstract static class Builder {
+      abstract Builder setDataSourceConfiguration(DataSourceConfiguration configuration);
+
+      abstract Builder setDatabase(String database);
+
+      abstract Builder setSslInvalidHostNameAllowed(boolean value);
+
+      abstract Builder setNoOfElementsToBatch(int noOfElementsToBatch);
+
+      abstract Builder setFlushDuration(int flushDuration);
+
+      abstract Builder setSslEnabled(boolean sslEnabled);
+
+      abstract Builder setRetentionPolicy(String retentionPolicy);
+
+      abstract Write build();
+    }
+
+    public Write withConfiguration(DataSourceConfiguration configuration) {
+      checkArgument(configuration != null, "configuration can not be null");
+      return builder().setDataSourceConfiguration(configuration).build();
+    }
+
+    public Write withDatabase(String database) {
+      return builder().setDatabase(database).build();
+    }
+
+    public Write withSslEnabled(boolean sslEnabled) {
+      return builder().setSslEnabled(sslEnabled).build();
+    }
+
+    public Write withSslInvalidHostNameAllowed(boolean value) {
+      return builder().setSslInvalidHostNameAllowed(value).build();
+    }
+
+    public Write withNoOfElementsToBatch(int noOfElementsToBatch) {
+      return builder().setNoOfElementsToBatch(noOfElementsToBatch).build();
+    }
+
+    public Write withFlushDuration(int flushDuration) {
+      return builder().setFlushDuration(flushDuration).build();
+    }
+
+    public Write withRetentionPolicy(String rp) {
+      return builder().setRetentionPolicy(rp).build();
+    }
+
+    private class InfluxWriterFn<T> extends DoFn<T, Void> {
+
+      private final Write spec;
+      private InfluxDB connection;

Review comment:
       If `InfluxDB ` is not serialisable then it should be transient.

##########
File path: sdks/java/io/influxdb/src/main/java/org/apache/beam/sdk/io/influxdb/InfluxDBIO.java
##########
@@ -0,0 +1,829 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.apache.beam.sdk.io.influxdb;
+
+import static org.apache.beam.vendor.guava.v26_0_jre.com.google.common.base.Preconditions.checkArgument;
+import static org.influxdb.BatchOptions.DEFAULT_BATCH_INTERVAL_DURATION;
+import static org.influxdb.BatchOptions.DEFAULT_BUFFER_LIMIT;
+
+import com.google.auto.value.AutoValue;
+import java.io.Serializable;
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.Collections;
+import java.util.Iterator;
+import java.util.LinkedHashSet;
+import java.util.List;
+import javax.annotation.Nullable;
+import javax.net.ssl.SSLContext;
+import javax.net.ssl.SSLSocketFactory;
+import javax.net.ssl.TrustManager;
+import javax.net.ssl.X509TrustManager;
+import okhttp3.OkHttpClient;
+import org.apache.beam.sdk.annotations.Experimental;
+import org.apache.beam.sdk.coders.Coder;
+import org.apache.beam.sdk.coders.StringUtf8Coder;
+import org.apache.beam.sdk.io.BoundedSource;
+import org.apache.beam.sdk.options.PipelineOptions;
+import org.apache.beam.sdk.options.ValueProvider;
+import org.apache.beam.sdk.transforms.DoFn;
+import org.apache.beam.sdk.transforms.PTransform;
+import org.apache.beam.sdk.transforms.ParDo;
+import org.apache.beam.sdk.transforms.SerializableFunction;
+import org.apache.beam.sdk.transforms.display.DisplayData;
+import org.apache.beam.sdk.transforms.display.HasDisplayData;
+import org.apache.beam.sdk.values.PBegin;
+import org.apache.beam.sdk.values.PCollection;
+import org.apache.beam.sdk.values.PDone;
+import org.influxdb.BatchOptions;
+import org.influxdb.InfluxDB;
+import org.influxdb.InfluxDBFactory;
+import org.influxdb.dto.Query;
+import org.influxdb.dto.QueryResult;
+import org.influxdb.dto.QueryResult.Result;
+import org.influxdb.dto.QueryResult.Series;
+import org.joda.time.DateTime;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+/**
+ * IO to read and write to InfluxDB.
+ *
+ * <h3>Reading from InfluxDB</h3>
+ *
+ * <p>InfluxDBIO {@link #read()} returns a bounded collection of {@code String} as a {@code
+ * PCollection<String>}.
+ *
+ * <p>you have to provide a {@link DataSourceConfiguration} using<br>
+ * {@link DataSourceConfiguration#create(String, String, String)}(url, userName and password).
+ * Optionally, {@link DataSourceConfiguration#withUsername(String)} and {@link
+ * DataSourceConfiguration#withPassword(String)} allows you to define userName and password.
+ *
+ * <p>For example:
+ *
+ * <pre>{@code
+ * PCollection<String> collection = pipeline.apply(InfluxDBIO.read()
+ *   .withDataSourceConfiguration(InfluxDBIO.DataSourceConfiguration.create(
+ *          "https://localhost:8086","userName","password"))
+ *   .withDatabase("metrics")
+ *   .withRetentionPolicy("autogen")
+ *   .withSslInvalidHostNameAllowed(true)
+ *   .withSslEnabled(true));
+ * }</pre>
+ *
+ * <p>Read with query example:
+ *
+ * <pre>{@code
+ * PCollection<String> collection = pipeline.apply(InfluxDBIO.read()
+ *   .withDataSourceConfiguration(InfluxDBIO.DataSourceConfiguration.create(
+ *          "https://localhost:8086","userName","password"))
+ *   .withDatabase("metrics")
+ *   .withQuery("SELECT * FROM CPU")
+ *   .withRetentionPolicy("autogen")
+ *   .withSslInvalidHostNameAllowed(true)
+ *   .withSslEnabled(true));
+ * }</pre>
+ *
+ * <h3>Writing to InfluxDB </h3>
+ *
+ * <p>InfluxDB sink supports writing records into a database. It writes a {@link PCollection} to the
+ * database by converting each T. The T should implement getLineProtocol() from {@link
+ * LineProtocolConvertable}.
+ *
+ * <p>Like the {@link #read()}, to configure the {@link #write()}, you have to provide a {@link
+ * DataSourceConfiguration}.
+ *
+ * <pre>{@code
+ * pipeline
+ *   .apply(...)
+ *   .apply(InfluxDb.write()
+ *      .withDataSourceConfiguration(InfluxDBIO.DataSourceConfiguration.create(
+ *            "https://localhost:8086","userName","password"))
+ *   .withRetentionPolicy("autogen")
+ *   .withDatabase("metrics")
+ *   .withSslInvalidHostNameAllowed(true)
+ *   .withSslEnabled(true));
+ *    );
+ * }</pre>
+ *
+ * *
+ */
+@Experimental(Experimental.Kind.SOURCE_SINK)
+public class InfluxDBIO {
+  private static final Logger LOG = LoggerFactory.getLogger(InfluxDBIO.class);
+
+  public static Write write() {
+    return new AutoValue_InfluxDBIO_Write.Builder()
+        .setSslEnabled(false)
+        .setSslInvalidHostNameAllowed(false)
+        .setFlushDuration(DEFAULT_BATCH_INTERVAL_DURATION)
+        .setNoOfElementsToBatch(DEFAULT_BUFFER_LIMIT)
+        .build();
+  }
+
+  public static Read read() {
+    return new AutoValue_InfluxDBIO_Read.Builder()
+        .setSslEnabled(false)
+        .setSslInvalidHostNameAllowed(false)
+        .setStartDateTime(DateTime.parse("1677-09-21T00:12:43.145224194Z"))
+        .setEndDateTime(DateTime.parse("2262-04-11T23:47:16.854775806Z"))
+        .setRetentionPolicy("autogen")
+        .build();
+  }
+
+  @AutoValue
+  public abstract static class Read extends PTransform<PBegin, PCollection<String>> {
+
+    abstract boolean sslInvalidHostNameAllowed();
+
+    abstract String retentionPolicy();
+
+    @Nullable
+    abstract String database();
+
+    @Nullable
+    abstract String query();
+
+    abstract boolean sslEnabled();
+
+    @Nullable
+    abstract DataSourceConfiguration dataSourceConfiguration();
+
+    @Nullable
+    abstract List<String> metrics();
+
+    abstract DateTime startDateTime();
+
+    abstract DateTime endDateTime();
+
+    @Nullable
+    abstract DateTime fromDateTime();
+
+    @Nullable
+    abstract DateTime toDateTime();
+
+    abstract Builder builder();
+
+    @AutoValue.Builder
+    abstract static class Builder {
+      abstract Builder setDataSourceConfiguration(DataSourceConfiguration configuration);
+
+      abstract Builder setDatabase(String database);
+
+      abstract Builder setSslInvalidHostNameAllowed(boolean value);
+
+      abstract Builder setRetentionPolicy(String retentionPolicy);
+
+      abstract Builder setQuery(String query);
+
+      abstract Builder setToDateTime(DateTime toDateTime);
+
+      abstract Builder setFromDateTime(DateTime fromDateTime);
+
+      abstract Builder setStartDateTime(DateTime startDateTime);
+
+      abstract Builder setEndDateTime(DateTime endDateTime);
+
+      abstract Builder setSslEnabled(boolean sslEnabled);
+
+      abstract Builder setMetrics(List<String> metrics);
+
+      abstract Read build();
+    }
+
+    /** Reads from the InfluxDB instance indicated by the given configuration. */
+    public Read withDataSourceConfiguration(DataSourceConfiguration configuration) {
+      checkArgument(configuration != null, "configuration can not be null");
+      return builder().setDataSourceConfiguration(configuration).build();
+    }
+
+    /** Reads from the specified database. */
+    public Read withDatabase(String database) {
+      return builder()
+          .setDatabase(database)
+          .setDataSourceConfiguration(dataSourceConfiguration())
+          .build();
+    }
+
+    public Read withToDateTime(DateTime toDateTime) {
+      return builder().setToDateTime(toDateTime).build();
+    }
+
+    public Read withFromDateTime(DateTime fromDateTime) {
+      return builder().setFromDateTime(fromDateTime).build();
+    }
+
+    public Read withStartDateTime(DateTime startDateTime) {
+      return builder().setStartDateTime(startDateTime).build();
+    }
+
+    public Read withEndDateTime(DateTime endDateTime) {
+      return builder().setEndDateTime(endDateTime).build();
+    }
+
+    public Read withMetrics(List<String> metrics) {
+      return builder().setMetrics(metrics).build();
+    }
+
+    public Read withMetrics(String... metrics) {
+      return withMetrics(Arrays.asList(metrics));
+    }
+
+    public Read withSslEnabled(boolean sslEnabled) {
+      return builder().setSslEnabled(sslEnabled).build();
+    }
+
+    public Read withSslInvalidHostNameAllowed(boolean value) {
+      return builder().setSslInvalidHostNameAllowed(value).build();
+    }
+
+    public Read withRetentionPolicy(String retentionPolicy) {
+      return builder().setRetentionPolicy(retentionPolicy).build();
+    }
+
+    public Read withQuery(String query) {
+      return builder().setQuery(query).build();
+    }
+
+    @Override
+    public PCollection<String> expand(PBegin input) {
+      checkArgument(dataSourceConfiguration() != null, "configuration is required");
+      checkArgument(query() != null || database() != null, "database or query is required");
+      if (database() != null) {
+        checkArgument(
+            checkDatabase(
+                database(), dataSourceConfiguration(), sslInvalidHostNameAllowed(), sslEnabled()),
+            "Database %s does not exist",
+            database());
+      }
+      return input.apply(org.apache.beam.sdk.io.Read.from(new InfluxDBSource(this)));
+    }
+
+    @Override
+    public void populateDisplayData(DisplayData.Builder builder) {
+      super.populateDisplayData(builder);
+      builder.addIfNotNull(
+          DisplayData.item("dataSourceConfiguration", dataSourceConfiguration().toString()));
+      builder.addIfNotNull(DisplayData.item("database", database()));
+      builder.addIfNotNull(DisplayData.item("retentionPolicy", retentionPolicy()));
+      builder.addIfNotNull(DisplayData.item("sslEnabled", sslEnabled()));
+      builder.addIfNotNull(DisplayData.item("query", query()));
+      builder.addIfNotNull(
+          DisplayData.item("sslInvalidHostNameAllowed", sslInvalidHostNameAllowed()));
+    }
+  }
+
+  static class InfluxDBSource extends BoundedSource<String> {
+    private final Read spec;
+
+    InfluxDBSource(Read read) {
+      this.spec = read;
+    }
+
+    @Override
+    public long getEstimatedSizeBytes(PipelineOptions pipelineOptions) {
+      String noOfBlocks = "NUMBER OF BLOCKS";
+      String sizeOfBlocks = "SIZE OF BLOCKS";
+      LinkedHashSet<Long> noOfBlocksValue = new LinkedHashSet<>();
+      LinkedHashSet<Long> sizeOfBlocksValue = new LinkedHashSet<>();
+      try (InfluxDB connection =
+          getConnection(
+              spec.dataSourceConfiguration(),
+              spec.sslInvalidHostNameAllowed(),
+              spec.sslEnabled())) {
+        String query = spec.query();
+        if (query == null) {
+          query =
+              String.format(
+                  "SELECT * FROM %s.%s", spec.retentionPolicy(), String.join(",", spec.metrics()));
+        }
+        QueryResult result = connection.query(new Query(query, spec.database()));
+        List<Result> results = result.getResults();
+        for (Result res : results) {
+          for (Series series : res.getSeries()) {
+            for (List<Object> data : series.getValues()) {
+              String s = data.get(0).toString();
+              if (s.startsWith(noOfBlocks)) {
+                noOfBlocksValue.add(Long.parseLong(s.split(":", -1)[1].trim()));
+              }
+              if (s.startsWith(sizeOfBlocks)) {
+                sizeOfBlocksValue.add(Long.parseLong(s.split(":", -1)[1].trim()));
+              }
+            }
+          }
+        }
+      }
+
+      Iterator<Long> noOfBlocksValueItr = noOfBlocksValue.iterator();
+      Iterator<Long> sizeOfBlocksValueItr = sizeOfBlocksValue.iterator();
+      long size = 0;
+      while (noOfBlocksValueItr.hasNext() && sizeOfBlocksValueItr.hasNext()) {
+        size = size + (noOfBlocksValueItr.next() * sizeOfBlocksValueItr.next());
+      }
+      return size;
+    }
+
+    @Override
+    public List<? extends BoundedSource<String>> split(
+        long desiredElementsInABundle, PipelineOptions options) {
+      List<ShardInformation> shardInfo =
+          getDBShardedInformation(
+              spec.database(),
+              spec.dataSourceConfiguration(),
+              spec.sslInvalidHostNameAllowed(),
+              spec.sslEnabled());
+      List<BoundedSource<String>> sources = new ArrayList<>();
+      if (spec.query() == null) {
+        for (ShardInformation sInfo : shardInfo) {
+          if (sInfo.getStartTime().compareTo(spec.startDateTime()) > 0) {
+            sources.add(
+                new InfluxDBSource(
+                    spec.withMetrics(spec.metrics())
+                        .withRetentionPolicy(sInfo.getRetentionPolicy())
+                        .withToDateTime(sInfo.getStartTime())
+                        .withFromDateTime(sInfo.getEndTime())));
+          }
+        }
+      } else {
+        sources.add(this);
+      }
+      return sources;
+    }
+
+    @Override
+    public BoundedReader<String> createReader(PipelineOptions pipelineOptions) {
+      return new BoundedInfluxDbReader(this);
+    }
+
+    @Override
+    public void validate() {
+      spec.validate(null /* input */);
+    }
+
+    @Override
+    public void populateDisplayData(DisplayData.Builder builder) {
+      spec.populateDisplayData(builder);
+    }
+
+    @Override
+    public Coder<String> getOutputCoder() {
+      return StringUtf8Coder.of();
+    }
+  }
+
+  private static String getQueryToRun(Read spec) {
+    if (spec.query() == null) {
+      if (spec.toDateTime() != null && spec.fromDateTime() != null) {
+        return String.format(
+            "SELECT * FROM %s.%s WHERE time >= '%s' and time <= '%s'",
+            spec.retentionPolicy(),
+            String.join(",", spec.metrics()),
+            spec.toDateTime(),
+            spec.fromDateTime());
+      } else {
+        return String.format(
+            "SELECT * FROM %s.%s", spec.retentionPolicy(), String.join(",", spec.metrics()));
+      }
+    }
+    return spec.query();
+  }
+
+  private static class BoundedInfluxDbReader extends BoundedSource.BoundedReader<String> {
+    private final InfluxDBIO.InfluxDBSource source;
+    private Iterator<Result> resultIterator;
+    private Iterator<Series> seriesIterator;
+    private Iterator<List<Object>> valuesIterator;
+    private List current;
+
+    public BoundedInfluxDbReader(InfluxDBIO.InfluxDBSource source) {
+      this.source = source;
+    }
+
+    @Override
+    public boolean start() {
+      InfluxDBIO.Read spec = source.spec;
+      try (InfluxDB influxDB =
+          getConnection(
+              spec.dataSourceConfiguration(),
+              spec.sslInvalidHostNameAllowed(),
+              spec.sslEnabled())) {
+        if (spec.database() != null) {
+          influxDB.setDatabase(spec.database());
+        }
+        if (spec.retentionPolicy() != null) {
+          influxDB.setRetentionPolicy(spec.retentionPolicy());
+        }
+        String query = getQueryToRun(spec);
+        QueryResult queryResult = influxDB.query(new Query(query, spec.database()));
+        resultIterator = queryResult.getResults().iterator();
+        if (resultIterator.hasNext()) {
+          seriesIterator = resultIterator.next().getSeries().iterator();
+        }
+        if (seriesIterator.hasNext()) {
+          valuesIterator = seriesIterator.next().getValues().iterator();
+        }
+      }
+      return advance();
+    }
+
+    @Override
+    public boolean advance() {
+      if (valuesIterator.hasNext()) {
+        current = valuesIterator.next();
+        return true;
+      } else if (seriesIterator.hasNext()) {
+        valuesIterator = seriesIterator.next().getValues().iterator();
+        current = valuesIterator.next();
+        return true;
+      } else if (resultIterator.hasNext()) {
+        seriesIterator = resultIterator.next().getSeries().iterator();
+        valuesIterator = seriesIterator.next().getValues().iterator();
+        current = valuesIterator.next();
+        return true;
+      } else {
+        return false;
+      }
+    }
+
+    @Override
+    public BoundedSource getCurrentSource() {
+      return source;
+    }
+
+    @Override
+    public String getCurrent() {
+      return current.toString();
+    }
+
+    @Override
+    public void close() {}
+  }
+
+  @AutoValue
+  public abstract static class Write extends PTransform<PCollection<String>, PDone> {
+
+    @Override
+    public PDone expand(PCollection<String> input) {
+      checkArgument(dataSourceConfiguration() != null, "withConfiguration() is required");
+      checkArgument(database() != null && !database().isEmpty(), "withDatabase() is required");
+      checkArgument(
+          checkDatabase(
+              database(), dataSourceConfiguration(), sslInvalidHostNameAllowed(), sslEnabled()),
+          "Database %s does not exist",
+          database());
+      input.apply(ParDo.of(new InfluxWriterFn(this)));
+      return PDone.in(input.getPipeline());
+    }
+
+    @Override
+    public void populateDisplayData(DisplayData.Builder builder) {
+      super.populateDisplayData(builder);
+      builder.addIfNotNull(
+          DisplayData.item("dataSourceConfiguration", dataSourceConfiguration().toString()));
+      builder.addIfNotNull(DisplayData.item("database", database()));
+      builder.addIfNotNull(DisplayData.item("retentionPolicy", retentionPolicy()));
+      builder.addIfNotNull(DisplayData.item("sslEnabled", sslEnabled()));
+      builder.addIfNotNull(
+          DisplayData.item("sslInvalidHostNameAllowed", sslInvalidHostNameAllowed()));
+      builder.addIfNotNull(DisplayData.item("noOfElementsToBatch", noOfElementsToBatch()));
+      builder.addIfNotNull(DisplayData.item("flushDuration", flushDuration()));
+    }
+
+    @Nullable
+    abstract String database();
+
+    @Nullable
+    abstract String retentionPolicy();
+
+    abstract boolean sslInvalidHostNameAllowed();
+
+    abstract boolean sslEnabled();
+
+    abstract int noOfElementsToBatch();
+
+    abstract int flushDuration();
+
+    @Nullable
+    abstract DataSourceConfiguration dataSourceConfiguration();
+
+    abstract Builder builder();
+
+    @AutoValue.Builder
+    abstract static class Builder {
+      abstract Builder setDataSourceConfiguration(DataSourceConfiguration configuration);
+
+      abstract Builder setDatabase(String database);
+
+      abstract Builder setSslInvalidHostNameAllowed(boolean value);
+
+      abstract Builder setNoOfElementsToBatch(int noOfElementsToBatch);
+
+      abstract Builder setFlushDuration(int flushDuration);
+
+      abstract Builder setSslEnabled(boolean sslEnabled);
+
+      abstract Builder setRetentionPolicy(String retentionPolicy);
+
+      abstract Write build();
+    }
+
+    public Write withConfiguration(DataSourceConfiguration configuration) {
+      checkArgument(configuration != null, "configuration can not be null");
+      return builder().setDataSourceConfiguration(configuration).build();
+    }
+
+    public Write withDatabase(String database) {
+      return builder().setDatabase(database).build();
+    }
+
+    public Write withSslEnabled(boolean sslEnabled) {
+      return builder().setSslEnabled(sslEnabled).build();
+    }
+
+    public Write withSslInvalidHostNameAllowed(boolean value) {
+      return builder().setSslInvalidHostNameAllowed(value).build();
+    }
+
+    public Write withNoOfElementsToBatch(int noOfElementsToBatch) {
+      return builder().setNoOfElementsToBatch(noOfElementsToBatch).build();
+    }
+
+    public Write withFlushDuration(int flushDuration) {
+      return builder().setFlushDuration(flushDuration).build();
+    }
+
+    public Write withRetentionPolicy(String rp) {
+      return builder().setRetentionPolicy(rp).build();
+    }
+
+    private class InfluxWriterFn<T> extends DoFn<T, Void> {
+
+      private final Write spec;
+      private InfluxDB connection;
+
+      InfluxWriterFn(Write write) {
+        this.spec = write;
+      }
+
+      @Setup
+      public void setup() {
+        connection =
+            getConnection(
+                spec.dataSourceConfiguration(), sslInvalidHostNameAllowed(), sslEnabled());
+        int flushDuration = spec.flushDuration();
+        int noOfBatchPoints = spec.noOfElementsToBatch();

Review comment:
       nit: `numOfBatchPoints `

##########
File path: sdks/java/io/influxdb/src/main/java/org/apache/beam/sdk/io/influxdb/InfluxDBIO.java
##########
@@ -0,0 +1,829 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.apache.beam.sdk.io.influxdb;
+
+import static org.apache.beam.vendor.guava.v26_0_jre.com.google.common.base.Preconditions.checkArgument;
+import static org.influxdb.BatchOptions.DEFAULT_BATCH_INTERVAL_DURATION;
+import static org.influxdb.BatchOptions.DEFAULT_BUFFER_LIMIT;
+
+import com.google.auto.value.AutoValue;
+import java.io.Serializable;
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.Collections;
+import java.util.Iterator;
+import java.util.LinkedHashSet;
+import java.util.List;
+import javax.annotation.Nullable;
+import javax.net.ssl.SSLContext;
+import javax.net.ssl.SSLSocketFactory;
+import javax.net.ssl.TrustManager;
+import javax.net.ssl.X509TrustManager;
+import okhttp3.OkHttpClient;
+import org.apache.beam.sdk.annotations.Experimental;
+import org.apache.beam.sdk.coders.Coder;
+import org.apache.beam.sdk.coders.StringUtf8Coder;
+import org.apache.beam.sdk.io.BoundedSource;
+import org.apache.beam.sdk.options.PipelineOptions;
+import org.apache.beam.sdk.options.ValueProvider;
+import org.apache.beam.sdk.transforms.DoFn;
+import org.apache.beam.sdk.transforms.PTransform;
+import org.apache.beam.sdk.transforms.ParDo;
+import org.apache.beam.sdk.transforms.SerializableFunction;
+import org.apache.beam.sdk.transforms.display.DisplayData;
+import org.apache.beam.sdk.transforms.display.HasDisplayData;
+import org.apache.beam.sdk.values.PBegin;
+import org.apache.beam.sdk.values.PCollection;
+import org.apache.beam.sdk.values.PDone;
+import org.influxdb.BatchOptions;
+import org.influxdb.InfluxDB;
+import org.influxdb.InfluxDBFactory;
+import org.influxdb.dto.Query;
+import org.influxdb.dto.QueryResult;
+import org.influxdb.dto.QueryResult.Result;
+import org.influxdb.dto.QueryResult.Series;
+import org.joda.time.DateTime;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+/**
+ * IO to read and write to InfluxDB.
+ *
+ * <h3>Reading from InfluxDB</h3>
+ *
+ * <p>InfluxDBIO {@link #read()} returns a bounded collection of {@code String} as a {@code
+ * PCollection<String>}.
+ *
+ * <p>you have to provide a {@link DataSourceConfiguration} using<br>
+ * {@link DataSourceConfiguration#create(String, String, String)}(url, userName and password).
+ * Optionally, {@link DataSourceConfiguration#withUsername(String)} and {@link
+ * DataSourceConfiguration#withPassword(String)} allows you to define userName and password.
+ *
+ * <p>For example:
+ *
+ * <pre>{@code
+ * PCollection<String> collection = pipeline.apply(InfluxDBIO.read()
+ *   .withDataSourceConfiguration(InfluxDBIO.DataSourceConfiguration.create(
+ *          "https://localhost:8086","userName","password"))
+ *   .withDatabase("metrics")
+ *   .withRetentionPolicy("autogen")
+ *   .withSslInvalidHostNameAllowed(true)
+ *   .withSslEnabled(true));
+ * }</pre>
+ *
+ * <p>Read with query example:
+ *
+ * <pre>{@code
+ * PCollection<String> collection = pipeline.apply(InfluxDBIO.read()
+ *   .withDataSourceConfiguration(InfluxDBIO.DataSourceConfiguration.create(
+ *          "https://localhost:8086","userName","password"))
+ *   .withDatabase("metrics")
+ *   .withQuery("SELECT * FROM CPU")
+ *   .withRetentionPolicy("autogen")
+ *   .withSslInvalidHostNameAllowed(true)
+ *   .withSslEnabled(true));
+ * }</pre>
+ *
+ * <h3>Writing to InfluxDB </h3>
+ *
+ * <p>InfluxDB sink supports writing records into a database. It writes a {@link PCollection} to the
+ * database by converting each T. The T should implement getLineProtocol() from {@link
+ * LineProtocolConvertable}.
+ *
+ * <p>Like the {@link #read()}, to configure the {@link #write()}, you have to provide a {@link
+ * DataSourceConfiguration}.
+ *
+ * <pre>{@code
+ * pipeline
+ *   .apply(...)
+ *   .apply(InfluxDb.write()
+ *      .withDataSourceConfiguration(InfluxDBIO.DataSourceConfiguration.create(
+ *            "https://localhost:8086","userName","password"))
+ *   .withRetentionPolicy("autogen")
+ *   .withDatabase("metrics")
+ *   .withSslInvalidHostNameAllowed(true)
+ *   .withSslEnabled(true));
+ *    );
+ * }</pre>
+ *
+ * *
+ */
+@Experimental(Experimental.Kind.SOURCE_SINK)
+public class InfluxDBIO {
+  private static final Logger LOG = LoggerFactory.getLogger(InfluxDBIO.class);
+
+  public static Write write() {
+    return new AutoValue_InfluxDBIO_Write.Builder()
+        .setSslEnabled(false)
+        .setSslInvalidHostNameAllowed(false)
+        .setFlushDuration(DEFAULT_BATCH_INTERVAL_DURATION)
+        .setNoOfElementsToBatch(DEFAULT_BUFFER_LIMIT)
+        .build();
+  }
+
+  public static Read read() {
+    return new AutoValue_InfluxDBIO_Read.Builder()
+        .setSslEnabled(false)
+        .setSslInvalidHostNameAllowed(false)
+        .setStartDateTime(DateTime.parse("1677-09-21T00:12:43.145224194Z"))
+        .setEndDateTime(DateTime.parse("2262-04-11T23:47:16.854775806Z"))
+        .setRetentionPolicy("autogen")
+        .build();
+  }
+
+  @AutoValue
+  public abstract static class Read extends PTransform<PBegin, PCollection<String>> {
+
+    abstract boolean sslInvalidHostNameAllowed();
+
+    abstract String retentionPolicy();
+
+    @Nullable
+    abstract String database();
+
+    @Nullable
+    abstract String query();
+
+    abstract boolean sslEnabled();
+
+    @Nullable
+    abstract DataSourceConfiguration dataSourceConfiguration();
+
+    @Nullable
+    abstract List<String> metrics();
+
+    abstract DateTime startDateTime();
+
+    abstract DateTime endDateTime();
+
+    @Nullable
+    abstract DateTime fromDateTime();
+
+    @Nullable
+    abstract DateTime toDateTime();
+
+    abstract Builder builder();
+
+    @AutoValue.Builder
+    abstract static class Builder {
+      abstract Builder setDataSourceConfiguration(DataSourceConfiguration configuration);
+
+      abstract Builder setDatabase(String database);
+
+      abstract Builder setSslInvalidHostNameAllowed(boolean value);
+
+      abstract Builder setRetentionPolicy(String retentionPolicy);
+
+      abstract Builder setQuery(String query);
+
+      abstract Builder setToDateTime(DateTime toDateTime);
+
+      abstract Builder setFromDateTime(DateTime fromDateTime);
+
+      abstract Builder setStartDateTime(DateTime startDateTime);
+
+      abstract Builder setEndDateTime(DateTime endDateTime);
+
+      abstract Builder setSslEnabled(boolean sslEnabled);
+
+      abstract Builder setMetrics(List<String> metrics);
+
+      abstract Read build();
+    }
+
+    /** Reads from the InfluxDB instance indicated by the given configuration. */
+    public Read withDataSourceConfiguration(DataSourceConfiguration configuration) {
+      checkArgument(configuration != null, "configuration can not be null");
+      return builder().setDataSourceConfiguration(configuration).build();
+    }
+
+    /** Reads from the specified database. */
+    public Read withDatabase(String database) {
+      return builder()
+          .setDatabase(database)
+          .setDataSourceConfiguration(dataSourceConfiguration())
+          .build();
+    }
+
+    public Read withToDateTime(DateTime toDateTime) {
+      return builder().setToDateTime(toDateTime).build();
+    }
+
+    public Read withFromDateTime(DateTime fromDateTime) {
+      return builder().setFromDateTime(fromDateTime).build();
+    }
+
+    public Read withStartDateTime(DateTime startDateTime) {
+      return builder().setStartDateTime(startDateTime).build();
+    }
+
+    public Read withEndDateTime(DateTime endDateTime) {
+      return builder().setEndDateTime(endDateTime).build();
+    }
+
+    public Read withMetrics(List<String> metrics) {
+      return builder().setMetrics(metrics).build();
+    }
+
+    public Read withMetrics(String... metrics) {
+      return withMetrics(Arrays.asList(metrics));
+    }
+
+    public Read withSslEnabled(boolean sslEnabled) {
+      return builder().setSslEnabled(sslEnabled).build();
+    }
+
+    public Read withSslInvalidHostNameAllowed(boolean value) {
+      return builder().setSslInvalidHostNameAllowed(value).build();
+    }
+
+    public Read withRetentionPolicy(String retentionPolicy) {
+      return builder().setRetentionPolicy(retentionPolicy).build();
+    }
+
+    public Read withQuery(String query) {
+      return builder().setQuery(query).build();
+    }
+
+    @Override
+    public PCollection<String> expand(PBegin input) {
+      checkArgument(dataSourceConfiguration() != null, "configuration is required");
+      checkArgument(query() != null || database() != null, "database or query is required");
+      if (database() != null) {
+        checkArgument(
+            checkDatabase(
+                database(), dataSourceConfiguration(), sslInvalidHostNameAllowed(), sslEnabled()),
+            "Database %s does not exist",
+            database());
+      }
+      return input.apply(org.apache.beam.sdk.io.Read.from(new InfluxDBSource(this)));
+    }
+
+    @Override
+    public void populateDisplayData(DisplayData.Builder builder) {
+      super.populateDisplayData(builder);
+      builder.addIfNotNull(
+          DisplayData.item("dataSourceConfiguration", dataSourceConfiguration().toString()));
+      builder.addIfNotNull(DisplayData.item("database", database()));
+      builder.addIfNotNull(DisplayData.item("retentionPolicy", retentionPolicy()));
+      builder.addIfNotNull(DisplayData.item("sslEnabled", sslEnabled()));
+      builder.addIfNotNull(DisplayData.item("query", query()));
+      builder.addIfNotNull(
+          DisplayData.item("sslInvalidHostNameAllowed", sslInvalidHostNameAllowed()));
+    }
+  }
+
+  static class InfluxDBSource extends BoundedSource<String> {
+    private final Read spec;
+
+    InfluxDBSource(Read read) {
+      this.spec = read;
+    }
+
+    @Override
+    public long getEstimatedSizeBytes(PipelineOptions pipelineOptions) {
+      String noOfBlocks = "NUMBER OF BLOCKS";
+      String sizeOfBlocks = "SIZE OF BLOCKS";
+      LinkedHashSet<Long> noOfBlocksValue = new LinkedHashSet<>();
+      LinkedHashSet<Long> sizeOfBlocksValue = new LinkedHashSet<>();
+      try (InfluxDB connection =
+          getConnection(
+              spec.dataSourceConfiguration(),
+              spec.sslInvalidHostNameAllowed(),
+              spec.sslEnabled())) {
+        String query = spec.query();
+        if (query == null) {
+          query =
+              String.format(
+                  "SELECT * FROM %s.%s", spec.retentionPolicy(), String.join(",", spec.metrics()));
+        }
+        QueryResult result = connection.query(new Query(query, spec.database()));
+        List<Result> results = result.getResults();
+        for (Result res : results) {
+          for (Series series : res.getSeries()) {
+            for (List<Object> data : series.getValues()) {
+              String s = data.get(0).toString();
+              if (s.startsWith(noOfBlocks)) {
+                noOfBlocksValue.add(Long.parseLong(s.split(":", -1)[1].trim()));
+              }
+              if (s.startsWith(sizeOfBlocks)) {
+                sizeOfBlocksValue.add(Long.parseLong(s.split(":", -1)[1].trim()));
+              }
+            }
+          }
+        }
+      }
+
+      Iterator<Long> noOfBlocksValueItr = noOfBlocksValue.iterator();
+      Iterator<Long> sizeOfBlocksValueItr = sizeOfBlocksValue.iterator();
+      long size = 0;
+      while (noOfBlocksValueItr.hasNext() && sizeOfBlocksValueItr.hasNext()) {
+        size = size + (noOfBlocksValueItr.next() * sizeOfBlocksValueItr.next());
+      }
+      return size;
+    }
+
+    @Override
+    public List<? extends BoundedSource<String>> split(
+        long desiredElementsInABundle, PipelineOptions options) {
+      List<ShardInformation> shardInfo =
+          getDBShardedInformation(
+              spec.database(),
+              spec.dataSourceConfiguration(),
+              spec.sslInvalidHostNameAllowed(),
+              spec.sslEnabled());
+      List<BoundedSource<String>> sources = new ArrayList<>();
+      if (spec.query() == null) {
+        for (ShardInformation sInfo : shardInfo) {
+          if (sInfo.getStartTime().compareTo(spec.startDateTime()) > 0) {
+            sources.add(
+                new InfluxDBSource(
+                    spec.withMetrics(spec.metrics())
+                        .withRetentionPolicy(sInfo.getRetentionPolicy())
+                        .withToDateTime(sInfo.getStartTime())
+                        .withFromDateTime(sInfo.getEndTime())));
+          }
+        }
+      } else {
+        sources.add(this);
+      }
+      return sources;
+    }
+
+    @Override
+    public BoundedReader<String> createReader(PipelineOptions pipelineOptions) {
+      return new BoundedInfluxDbReader(this);
+    }
+
+    @Override
+    public void validate() {
+      spec.validate(null /* input */);
+    }
+
+    @Override
+    public void populateDisplayData(DisplayData.Builder builder) {
+      spec.populateDisplayData(builder);
+    }
+
+    @Override
+    public Coder<String> getOutputCoder() {
+      return StringUtf8Coder.of();
+    }
+  }
+
+  private static String getQueryToRun(Read spec) {
+    if (spec.query() == null) {
+      if (spec.toDateTime() != null && spec.fromDateTime() != null) {
+        return String.format(
+            "SELECT * FROM %s.%s WHERE time >= '%s' and time <= '%s'",
+            spec.retentionPolicy(),
+            String.join(",", spec.metrics()),
+            spec.toDateTime(),
+            spec.fromDateTime());
+      } else {
+        return String.format(
+            "SELECT * FROM %s.%s", spec.retentionPolicy(), String.join(",", spec.metrics()));
+      }
+    }
+    return spec.query();
+  }
+
+  private static class BoundedInfluxDbReader extends BoundedSource.BoundedReader<String> {
+    private final InfluxDBIO.InfluxDBSource source;
+    private Iterator<Result> resultIterator;
+    private Iterator<Series> seriesIterator;
+    private Iterator<List<Object>> valuesIterator;
+    private List current;
+
+    public BoundedInfluxDbReader(InfluxDBIO.InfluxDBSource source) {
+      this.source = source;
+    }
+
+    @Override
+    public boolean start() {
+      InfluxDBIO.Read spec = source.spec;
+      try (InfluxDB influxDB =
+          getConnection(
+              spec.dataSourceConfiguration(),
+              spec.sslInvalidHostNameAllowed(),
+              spec.sslEnabled())) {
+        if (spec.database() != null) {
+          influxDB.setDatabase(spec.database());
+        }
+        if (spec.retentionPolicy() != null) {
+          influxDB.setRetentionPolicy(spec.retentionPolicy());
+        }
+        String query = getQueryToRun(spec);
+        QueryResult queryResult = influxDB.query(new Query(query, spec.database()));
+        resultIterator = queryResult.getResults().iterator();
+        if (resultIterator.hasNext()) {
+          seriesIterator = resultIterator.next().getSeries().iterator();
+        }
+        if (seriesIterator.hasNext()) {
+          valuesIterator = seriesIterator.next().getValues().iterator();
+        }
+      }
+      return advance();
+    }
+
+    @Override
+    public boolean advance() {
+      if (valuesIterator.hasNext()) {
+        current = valuesIterator.next();
+        return true;
+      } else if (seriesIterator.hasNext()) {
+        valuesIterator = seriesIterator.next().getValues().iterator();
+        current = valuesIterator.next();
+        return true;
+      } else if (resultIterator.hasNext()) {
+        seriesIterator = resultIterator.next().getSeries().iterator();
+        valuesIterator = seriesIterator.next().getValues().iterator();
+        current = valuesIterator.next();
+        return true;
+      } else {
+        return false;
+      }
+    }
+
+    @Override
+    public BoundedSource getCurrentSource() {
+      return source;
+    }
+
+    @Override
+    public String getCurrent() {
+      return current.toString();
+    }
+
+    @Override
+    public void close() {}
+  }
+
+  @AutoValue
+  public abstract static class Write extends PTransform<PCollection<String>, PDone> {
+
+    @Override
+    public PDone expand(PCollection<String> input) {
+      checkArgument(dataSourceConfiguration() != null, "withConfiguration() is required");
+      checkArgument(database() != null && !database().isEmpty(), "withDatabase() is required");
+      checkArgument(
+          checkDatabase(
+              database(), dataSourceConfiguration(), sslInvalidHostNameAllowed(), sslEnabled()),
+          "Database %s does not exist",
+          database());
+      input.apply(ParDo.of(new InfluxWriterFn(this)));
+      return PDone.in(input.getPipeline());
+    }
+
+    @Override
+    public void populateDisplayData(DisplayData.Builder builder) {
+      super.populateDisplayData(builder);
+      builder.addIfNotNull(
+          DisplayData.item("dataSourceConfiguration", dataSourceConfiguration().toString()));
+      builder.addIfNotNull(DisplayData.item("database", database()));
+      builder.addIfNotNull(DisplayData.item("retentionPolicy", retentionPolicy()));
+      builder.addIfNotNull(DisplayData.item("sslEnabled", sslEnabled()));
+      builder.addIfNotNull(
+          DisplayData.item("sslInvalidHostNameAllowed", sslInvalidHostNameAllowed()));
+      builder.addIfNotNull(DisplayData.item("noOfElementsToBatch", noOfElementsToBatch()));
+      builder.addIfNotNull(DisplayData.item("flushDuration", flushDuration()));
+    }
+
+    @Nullable
+    abstract String database();
+
+    @Nullable
+    abstract String retentionPolicy();
+
+    abstract boolean sslInvalidHostNameAllowed();
+
+    abstract boolean sslEnabled();
+
+    abstract int noOfElementsToBatch();
+
+    abstract int flushDuration();
+
+    @Nullable
+    abstract DataSourceConfiguration dataSourceConfiguration();
+
+    abstract Builder builder();
+
+    @AutoValue.Builder
+    abstract static class Builder {
+      abstract Builder setDataSourceConfiguration(DataSourceConfiguration configuration);
+
+      abstract Builder setDatabase(String database);
+
+      abstract Builder setSslInvalidHostNameAllowed(boolean value);
+
+      abstract Builder setNoOfElementsToBatch(int noOfElementsToBatch);
+
+      abstract Builder setFlushDuration(int flushDuration);
+
+      abstract Builder setSslEnabled(boolean sslEnabled);
+
+      abstract Builder setRetentionPolicy(String retentionPolicy);
+
+      abstract Write build();
+    }
+
+    public Write withConfiguration(DataSourceConfiguration configuration) {
+      checkArgument(configuration != null, "configuration can not be null");
+      return builder().setDataSourceConfiguration(configuration).build();
+    }
+
+    public Write withDatabase(String database) {
+      return builder().setDatabase(database).build();
+    }
+
+    public Write withSslEnabled(boolean sslEnabled) {
+      return builder().setSslEnabled(sslEnabled).build();
+    }
+
+    public Write withSslInvalidHostNameAllowed(boolean value) {
+      return builder().setSslInvalidHostNameAllowed(value).build();
+    }
+
+    public Write withNoOfElementsToBatch(int noOfElementsToBatch) {
+      return builder().setNoOfElementsToBatch(noOfElementsToBatch).build();
+    }
+
+    public Write withFlushDuration(int flushDuration) {
+      return builder().setFlushDuration(flushDuration).build();
+    }
+
+    public Write withRetentionPolicy(String rp) {
+      return builder().setRetentionPolicy(rp).build();
+    }
+
+    private class InfluxWriterFn<T> extends DoFn<T, Void> {
+
+      private final Write spec;
+      private InfluxDB connection;
+
+      InfluxWriterFn(Write write) {
+        this.spec = write;
+      }
+
+      @Setup
+      public void setup() {
+        connection =
+            getConnection(
+                spec.dataSourceConfiguration(), sslInvalidHostNameAllowed(), sslEnabled());
+        int flushDuration = spec.flushDuration();
+        int noOfBatchPoints = spec.noOfElementsToBatch();
+        connection.enableBatch(
+            BatchOptions.DEFAULTS.actions(noOfBatchPoints).flushDuration(flushDuration));
+        connection.setRetentionPolicy(spec.retentionPolicy());
+        connection.setDatabase(spec.database());
+      }
+
+      @ProcessElement
+      public void processElement(ProcessContext c) {
+        connection.write(c.element().toString());
+      }
+
+      @FinishBundle
+      public void finishBundle() {
+        connection.flush();
+      }
+
+      @Teardown
+      public void tearDown() {
+        if (connection != null) {
+          connection.flush();
+          connection.close();
+          connection = null;
+        }
+      }
+
+      @Override
+      public void populateDisplayData(DisplayData.Builder builder) {
+        builder.delegate(Write.this);
+      }
+    }
+  }
+
+  private static OkHttpClient.Builder getUnsafeOkHttpClient() {

Review comment:
       What is a reason to have unsafe https client?




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