[GitHub] [incubator-hudi] bvaradar commented on a change in pull request #929: [HUDI-271] Create QuickstartUtils class towards simplifying quickstar…

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bvaradar commented on a change in pull request #929: [HUDI-271] Create QuickstartUtils class towards simplifying quickstar…
URL: https://github.com/apache/incubator-hudi/pull/929#discussion_r329309392
 
 

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 File path: hudi-spark/src/main/java/org/apache/hudi/QuickstartUtils.java
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+/*
+ * 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.hudi;
+
+import com.fasterxml.jackson.databind.ObjectMapper;
+import java.io.ByteArrayInputStream;
+import java.io.ByteArrayOutputStream;
+import java.io.IOException;
+import java.io.Serializable;
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+import java.util.Random;
+import java.util.UUID;
+import java.util.stream.Collectors;
+import java.util.stream.IntStream;
+import java.util.stream.Stream;
+import java.util.zip.Deflater;
+import java.util.zip.DeflaterOutputStream;
+import java.util.zip.InflaterInputStream;
+import org.apache.avro.Schema;
+import org.apache.avro.generic.GenericData;
+import org.apache.avro.generic.GenericRecord;
+import org.apache.avro.generic.IndexedRecord;
+import org.apache.hudi.avro.MercifulJsonConverter;
+import org.apache.hudi.common.model.HoodieKey;
+import org.apache.hudi.common.model.HoodieRecord;
+import org.apache.hudi.common.model.HoodieRecordPayload;
+import org.apache.hudi.common.util.FileIOUtils;
+import org.apache.hudi.common.util.Option;
+import org.apache.hudi.exception.HoodieIOException;
+
+/**
+ * Class to be used in quickstart guide for generating inserts and updates against a corpus.
+ * <p>
+ * Test data uses a toy Uber trips, data model.
+ *
+ */
+public class QuickstartUtils {
+
+  public static class DataGenerator {
+    private static final String DEFAULT_FIRST_PARTITION_PATH = "2019/09/15";
+    private static final String DEFAULT_SECOND_PARTITION_PATH = "2018/09/16";
+    private static final String DEFAULT_THIRD_PARTITION_PATH = "2018/09/17";
+
+    private static final String[] DEFAULT_PARTITION_PATHS = {
+        DEFAULT_FIRST_PARTITION_PATH,
+        DEFAULT_SECOND_PARTITION_PATH,
+        DEFAULT_THIRD_PARTITION_PATH
+    };
+    static String TRIP_EXAMPLE_SCHEMA = "{\"type\": \"record\"," + "\"name\": \"triprec\"," + "\"fields\": [ "
+        + "{\"name\": \"ts\",\"type\": \"double\"},"
+        + "{\"name\": \"uuid\", \"type\": \"string\"},"
+        + "{\"name\": \"rider\", \"type\": \"string\"},"
+        + "{\"name\": \"driver\", \"type\": \"string\"},"
+        + "{\"name\": \"begin_lat\", \"type\": \"double\"},"
+        + "{\"name\": \"begin_lon\", \"type\": \"double\"},"
+        + "{\"name\": \"end_lat\", \"type\": \"double\"},"
+        + "{\"name\": \"end_lon\", \"type\": \"double\"},"
+        + "{\"name\":\"fare\",\"type\": \"double\"}]}";
+    static Schema avroSchema = new Schema.Parser().parse(TRIP_EXAMPLE_SCHEMA);
+
+    private static Random rand = new Random(46474747);
+
+    private final Map<Integer, KeyPartition> existingKeys;
+    private final String[] partitionPaths;
+    private int numExistingKeys;
+
+    public DataGenerator() {
+      this(DEFAULT_PARTITION_PATHS, new HashMap<>());
+    }
+
+    private DataGenerator(String[] partitionPaths, Map<Integer, KeyPartition> keyPartitionMap) {
+      this.partitionPaths = Arrays.copyOf(partitionPaths, partitionPaths.length);
+      this.existingKeys = keyPartitionMap;
+    }
+
+    private static String generateRandomCommitMsg() {
+      int leftLimit = 48; // ascii for 0
+      int rightLimit = 57; // ascii for 9
+      int stringLength = 3;
+      StringBuilder buffer = new StringBuilder(stringLength);
+      for (int i = 0; i < stringLength; i++) {
+        int randomLimitedInt = leftLimit + (int)
+            (rand.nextFloat() * (rightLimit - leftLimit + 1));
+        buffer.append((char) randomLimitedInt);
+      }
+      return buffer.toString();
+    }
+
+    public int getNumExistingKeys() {
+      return numExistingKeys;
+    }
+
+    public static GenericRecord generateGenericRecord(String rowKey, String riderName, String driverName,
+                                                      double timestamp) {
+      GenericRecord rec = new GenericData.Record(avroSchema);
+      rec.put("uuid", rowKey);
+      rec.put("ts", timestamp);
+      rec.put("rider", riderName);
+      rec.put("driver", driverName);
+      rec.put("begin_lat", rand.nextDouble());
+      rec.put("begin_lon", rand.nextDouble());
+      rec.put("end_lat", rand.nextDouble());
+      rec.put("end_lon", rand.nextDouble());
+      rec.put("fare", rand.nextDouble() * 100);
+      return rec;
+    }
+
+    /**
+     * Generates a new avro record of the above schema format, retaining the key if optionally provided.
+     */
+    public static TestRawTripPayload generateRandomValue(HoodieKey key, String commitTime) throws IOException {
+      GenericRecord rec = generateGenericRecord(key.getRecordKey(), "rider-" + commitTime, "driver-" + commitTime, 0.0);
 
 Review comment:
   If commitTime is something which denotes a random value, we can rename from commitTime to randomString or a better name ?

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