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Posted to issues@flink.apache.org by GitBox <gi...@apache.org> on 2020/08/11 09:09:58 UTC
[GitHub] [flink] tzulitai commented on a change in pull request #12881: [FLINK-18512][kinesis] Introducing RecordPublisher. Refactor ShardConsumer to use PollingRecordPublisher
tzulitai commented on a change in pull request #12881:
URL: https://github.com/apache/flink/pull/12881#discussion_r468417898
##########
File path: flink-connectors/flink-connector-kinesis/src/main/java/org/apache/flink/streaming/connectors/kinesis/internals/publisher/polling/PollingRecordPublisher.java
##########
@@ -0,0 +1,162 @@
+/*
+ * 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.flink.streaming.connectors.kinesis.internals.publisher.polling;
+
+import org.apache.flink.annotation.Internal;
+import org.apache.flink.streaming.connectors.kinesis.internals.publisher.RecordBatch;
+import org.apache.flink.streaming.connectors.kinesis.internals.publisher.RecordPublisher;
+import org.apache.flink.streaming.connectors.kinesis.metrics.PollingRecordPublisherMetricsReporter;
+import org.apache.flink.streaming.connectors.kinesis.model.SequenceNumber;
+import org.apache.flink.streaming.connectors.kinesis.model.StartingPosition;
+import org.apache.flink.streaming.connectors.kinesis.model.StreamShardHandle;
+import org.apache.flink.streaming.connectors.kinesis.proxy.KinesisProxyInterface;
+
+import com.amazonaws.services.kinesis.model.ExpiredIteratorException;
+import com.amazonaws.services.kinesis.model.GetRecordsResult;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import javax.annotation.Nullable;
+
+import java.util.function.Consumer;
+
+import static com.amazonaws.services.kinesis.model.ShardIteratorType.LATEST;
+import static org.apache.flink.streaming.connectors.kinesis.internals.publisher.RecordPublisher.RecordPublisherRunResult.COMPLETE;
+import static org.apache.flink.streaming.connectors.kinesis.internals.publisher.RecordPublisher.RecordPublisherRunResult.INCOMPLETE;
+
+/**
+ * A {@link RecordPublisher} that will read records from Kinesis and forward them to the subscriber.
+ * Records are consumed by polling the GetRecords KDS API using a ShardIterator.
+ */
+@Internal
+public class PollingRecordPublisher implements RecordPublisher {
+
+ private static final Logger LOG = LoggerFactory.getLogger(PollingRecordPublisher.class);
+
+ private final PollingRecordPublisherMetricsReporter metricsReporter;
+
+ private final KinesisProxyInterface kinesisProxy;
+
+ private final StreamShardHandle subscribedShard;
+
+ private String nextShardItr;
+
+ private final int maxNumberOfRecordsPerFetch;
+
+ private final long expiredIteratorBackoffMillis;
+
+ /**
+ * A Polling implementation of {@link RecordPublisher} that polls kinesis for records.
+ * The following KDS services are used: GetRecords and GetShardIterator.
+ *
+ * @param subscribedShard the shard in which to consume from
+ * @param metricsReporter a metric reporter used to output metrics
+ * @param kinesisProxy the proxy used to communicate with kinesis
+ * @param maxNumberOfRecordsPerFetch the maximum number of records to retrieve per batch
+ * @param expiredIteratorBackoffMillis the duration to sleep in the event of an {@link ExpiredIteratorException}
+ */
+ public PollingRecordPublisher(
Review comment:
constructor can be package-private
##########
File path: flink-connectors/flink-connector-kinesis/src/main/java/org/apache/flink/streaming/connectors/kinesis/internals/publisher/polling/PollingRecordPublisher.java
##########
@@ -0,0 +1,162 @@
+/*
+ * 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.flink.streaming.connectors.kinesis.internals.publisher.polling;
+
+import org.apache.flink.annotation.Internal;
+import org.apache.flink.streaming.connectors.kinesis.internals.publisher.RecordBatch;
+import org.apache.flink.streaming.connectors.kinesis.internals.publisher.RecordPublisher;
+import org.apache.flink.streaming.connectors.kinesis.metrics.PollingRecordPublisherMetricsReporter;
+import org.apache.flink.streaming.connectors.kinesis.model.SequenceNumber;
+import org.apache.flink.streaming.connectors.kinesis.model.StartingPosition;
+import org.apache.flink.streaming.connectors.kinesis.model.StreamShardHandle;
+import org.apache.flink.streaming.connectors.kinesis.proxy.KinesisProxyInterface;
+
+import com.amazonaws.services.kinesis.model.ExpiredIteratorException;
+import com.amazonaws.services.kinesis.model.GetRecordsResult;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import javax.annotation.Nullable;
+
+import java.util.function.Consumer;
+
+import static com.amazonaws.services.kinesis.model.ShardIteratorType.LATEST;
+import static org.apache.flink.streaming.connectors.kinesis.internals.publisher.RecordPublisher.RecordPublisherRunResult.COMPLETE;
+import static org.apache.flink.streaming.connectors.kinesis.internals.publisher.RecordPublisher.RecordPublisherRunResult.INCOMPLETE;
+
+/**
+ * A {@link RecordPublisher} that will read records from Kinesis and forward them to the subscriber.
+ * Records are consumed by polling the GetRecords KDS API using a ShardIterator.
+ */
+@Internal
+public class PollingRecordPublisher implements RecordPublisher {
+
+ private static final Logger LOG = LoggerFactory.getLogger(PollingRecordPublisher.class);
+
+ private final PollingRecordPublisherMetricsReporter metricsReporter;
+
+ private final KinesisProxyInterface kinesisProxy;
+
+ private final StreamShardHandle subscribedShard;
+
+ private String nextShardItr;
+
+ private final int maxNumberOfRecordsPerFetch;
+
+ private final long expiredIteratorBackoffMillis;
+
+ /**
+ * A Polling implementation of {@link RecordPublisher} that polls kinesis for records.
+ * The following KDS services are used: GetRecords and GetShardIterator.
+ *
+ * @param subscribedShard the shard in which to consume from
+ * @param metricsReporter a metric reporter used to output metrics
+ * @param kinesisProxy the proxy used to communicate with kinesis
+ * @param maxNumberOfRecordsPerFetch the maximum number of records to retrieve per batch
+ * @param expiredIteratorBackoffMillis the duration to sleep in the event of an {@link ExpiredIteratorException}
+ */
+ public PollingRecordPublisher(
+ final StreamShardHandle subscribedShard,
+ final PollingRecordPublisherMetricsReporter metricsReporter,
+ final KinesisProxyInterface kinesisProxy,
+ final int maxNumberOfRecordsPerFetch,
+ final long expiredIteratorBackoffMillis) {
+ this.subscribedShard = subscribedShard;
+ this.metricsReporter = metricsReporter;
+ this.kinesisProxy = kinesisProxy;
+ this.maxNumberOfRecordsPerFetch = maxNumberOfRecordsPerFetch;
+ this.expiredIteratorBackoffMillis = expiredIteratorBackoffMillis;
+ }
+
+ @Override
+ public RecordPublisherRunResult run(final StartingPosition startingPosition, final Consumer<RecordBatch> consumer) throws InterruptedException {
+ return run(startingPosition, consumer, maxNumberOfRecordsPerFetch);
+ }
+
+ public RecordPublisherRunResult run(final StartingPosition startingPosition, final Consumer<RecordBatch> consumer, int maxNumberOfRecords) throws InterruptedException {
+ if (nextShardItr == null) {
+ nextShardItr = getShardIterator(startingPosition);
+ }
+
+ if (nextShardItr == null) {
+ return COMPLETE;
+ }
+
+ metricsReporter.setMaxNumberOfRecordsPerFetch(maxNumberOfRecords);
+
+ GetRecordsResult result = getRecords(nextShardItr, startingPosition, maxNumberOfRecords);
+
+ consumer.accept(new RecordBatch(result.getRecords(), subscribedShard, result.getMillisBehindLatest()));
+
+ nextShardItr = result.getNextShardIterator();
+ return nextShardItr == null ? COMPLETE : INCOMPLETE;
+ }
+
+ /**
+ * Calls {@link KinesisProxyInterface#getRecords(String, int)}, while also handling unexpected
+ * AWS {@link ExpiredIteratorException}s to assure that we get results and don't just fail on
+ * such occasions. The returned shard iterator within the successful {@link GetRecordsResult} should
+ * be used for the next call to this method.
+ *
+ * <p>Note: it is important that this method is not called again before all the records from the last result have been
+ * fully collected with {@code ShardConsumer#deserializeRecordForCollectionAndUpdateState(UserRecord)}, otherwise
+ * {@code ShardConsumer#lastSequenceNum} may refer to a sub-record in the middle of an aggregated record, leading to
+ * incorrect shard iteration if the iterator had to be refreshed.
+ *
+ * @param shardItr shard iterator to use
+ * @param startingPosition the position in the stream in which to consume from
+ * @param maxNumberOfRecords the maximum number of records to fetch for this getRecords attempt
+ * @return get records result
+ */
+ private GetRecordsResult getRecords(String shardItr, final StartingPosition startingPosition, int maxNumberOfRecords) throws InterruptedException {
+ GetRecordsResult getRecordsResult = null;
+ while (getRecordsResult == null) {
+ try {
+ getRecordsResult = kinesisProxy.getRecords(shardItr, maxNumberOfRecords);
+ } catch (ExpiredIteratorException eiEx) {
+ LOG.warn("Encountered an unexpected expired iterator {} for shard {};" +
+ " refreshing the iterator ...", shardItr, subscribedShard);
+
+ shardItr = getShardIterator(startingPosition);
+
+ // sleep for the fetch interval before the next getRecords attempt with the refreshed iterator
+ if (expiredIteratorBackoffMillis != 0) {
+ Thread.sleep(expiredIteratorBackoffMillis);
+ }
+ }
+ }
+ return getRecordsResult;
+ }
+
+ /**
+ * Returns a shard iterator for the given {@link SequenceNumber}.
+ *
+ * @return shard iterator
+ */
+ @Nullable
+ private String getShardIterator(final StartingPosition startingPosition) throws InterruptedException {
+ if (startingPosition.getShardIteratorType() == LATEST && subscribedShard.isClosed()) {
+ return null;
+ }
+
+ return kinesisProxy.getShardIterator(
Review comment:
Double checking for my understanding:
Does this return `null` for an out-of-bounds position?
Say, the given timestamp is out of bounds or the sequence number is non-existent.
##########
File path: flink-connectors/flink-connector-kinesis/src/main/java/org/apache/flink/streaming/connectors/kinesis/internals/publisher/polling/PollingRecordPublisher.java
##########
@@ -0,0 +1,162 @@
+/*
+ * 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.flink.streaming.connectors.kinesis.internals.publisher.polling;
+
+import org.apache.flink.annotation.Internal;
+import org.apache.flink.streaming.connectors.kinesis.internals.publisher.RecordBatch;
+import org.apache.flink.streaming.connectors.kinesis.internals.publisher.RecordPublisher;
+import org.apache.flink.streaming.connectors.kinesis.metrics.PollingRecordPublisherMetricsReporter;
+import org.apache.flink.streaming.connectors.kinesis.model.SequenceNumber;
+import org.apache.flink.streaming.connectors.kinesis.model.StartingPosition;
+import org.apache.flink.streaming.connectors.kinesis.model.StreamShardHandle;
+import org.apache.flink.streaming.connectors.kinesis.proxy.KinesisProxyInterface;
+
+import com.amazonaws.services.kinesis.model.ExpiredIteratorException;
+import com.amazonaws.services.kinesis.model.GetRecordsResult;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import javax.annotation.Nullable;
+
+import java.util.function.Consumer;
+
+import static com.amazonaws.services.kinesis.model.ShardIteratorType.LATEST;
+import static org.apache.flink.streaming.connectors.kinesis.internals.publisher.RecordPublisher.RecordPublisherRunResult.COMPLETE;
+import static org.apache.flink.streaming.connectors.kinesis.internals.publisher.RecordPublisher.RecordPublisherRunResult.INCOMPLETE;
+
+/**
+ * A {@link RecordPublisher} that will read records from Kinesis and forward them to the subscriber.
+ * Records are consumed by polling the GetRecords KDS API using a ShardIterator.
+ */
+@Internal
+public class PollingRecordPublisher implements RecordPublisher {
+
+ private static final Logger LOG = LoggerFactory.getLogger(PollingRecordPublisher.class);
+
+ private final PollingRecordPublisherMetricsReporter metricsReporter;
+
+ private final KinesisProxyInterface kinesisProxy;
+
+ private final StreamShardHandle subscribedShard;
+
+ private String nextShardItr;
+
+ private final int maxNumberOfRecordsPerFetch;
+
+ private final long expiredIteratorBackoffMillis;
+
+ /**
+ * A Polling implementation of {@link RecordPublisher} that polls kinesis for records.
+ * The following KDS services are used: GetRecords and GetShardIterator.
+ *
+ * @param subscribedShard the shard in which to consume from
+ * @param metricsReporter a metric reporter used to output metrics
+ * @param kinesisProxy the proxy used to communicate with kinesis
+ * @param maxNumberOfRecordsPerFetch the maximum number of records to retrieve per batch
+ * @param expiredIteratorBackoffMillis the duration to sleep in the event of an {@link ExpiredIteratorException}
+ */
+ public PollingRecordPublisher(
+ final StreamShardHandle subscribedShard,
+ final PollingRecordPublisherMetricsReporter metricsReporter,
+ final KinesisProxyInterface kinesisProxy,
+ final int maxNumberOfRecordsPerFetch,
+ final long expiredIteratorBackoffMillis) {
+ this.subscribedShard = subscribedShard;
Review comment:
Could you add simple sanity checks on these arguments, such as `Preconditions.checkNonNull`?
##########
File path: flink-connectors/flink-connector-kinesis/src/main/java/org/apache/flink/streaming/connectors/kinesis/internals/ShardConsumer.java
##########
@@ -53,283 +49,111 @@
*/
@Internal
public class ShardConsumer<T> implements Runnable {
Review comment:
With the record polling refactored out, could you rephrase the class-level Javadoc of this class?
Essentially this is now a thread that just subscribes to a `RecordPublisher` which publishes records from a single Kinesis shard.
##########
File path: flink-connectors/flink-connector-kinesis/src/main/java/org/apache/flink/streaming/connectors/kinesis/internals/ShardConsumer.java
##########
@@ -379,49 +206,18 @@ private void deserializeRecordForCollectionAndUpdateState(UserRecord record)
}
/**
- * Calls {@link KinesisProxyInterface#getRecords(String, int)}, while also handling unexpected
- * AWS {@link ExpiredIteratorException}s to assure that we get results and don't just fail on
- * such occasions. The returned shard iterator within the successful {@link GetRecordsResult} should
- * be used for the next call to this method.
+ * Filters out aggregated records that have previously been processed.
+ * This method is to support restarting from a partially consumed aggregated sequence number.
*
- * <p>Note: it is important that this method is not called again before all the records from the last result have been
- * fully collected with {@link ShardConsumer#deserializeRecordForCollectionAndUpdateState(UserRecord)}, otherwise
- * {@link ShardConsumer#lastSequenceNum} may refer to a sub-record in the middle of an aggregated record, leading to
- * incorrect shard iteration if the iterator had to be refreshed.
- *
- * @param shardItr shard iterator to use
- * @param maxNumberOfRecords the maximum number of records to fetch for this getRecords attempt
- * @return get records result
- * @throws InterruptedException
+ * @param record the record to filter
+ * @return {@code true} if the record should be retained
*/
- private GetRecordsResult getRecords(String shardItr, int maxNumberOfRecords) throws Exception {
- GetRecordsResult getRecordsResult = null;
- while (getRecordsResult == null) {
- try {
- getRecordsResult = kinesis.getRecords(shardItr, maxNumberOfRecords);
-
- // Update millis behind latest so it gets reported by the millisBehindLatest gauge
- Long millisBehindLatest = getRecordsResult.getMillisBehindLatest();
- if (millisBehindLatest != null) {
- shardMetricsReporter.setMillisBehindLatest(millisBehindLatest);
- }
- } catch (ExpiredIteratorException eiEx) {
- LOG.warn("Encountered an unexpected expired iterator {} for shard {};" +
- " refreshing the iterator ...", shardItr, subscribedShard);
-
- shardItr = getShardIterator(lastSequenceNum);
-
- // sleep for the fetch interval before the next getRecords attempt with the refreshed iterator
- if (fetchIntervalMillis != 0) {
- Thread.sleep(fetchIntervalMillis);
- }
- }
+ private boolean filterDeaggregatedRecord(final UserRecord record) {
+ if (lastSequenceNum.isAggregated()) {
+ return !record.getSequenceNumber().equals(lastSequenceNum.getSequenceNumber()) ||
+ record.getSubSequenceNumber() > lastSequenceNum.getSubSequenceNumber();
}
- return getRecordsResult;
- }
- @SuppressWarnings("unchecked")
- protected static List<UserRecord> deaggregateRecords(List<Record> records, String startingHashKey, String endingHashKey) {
- return UserRecord.deaggregate(records, new BigInteger(startingHashKey), new BigInteger(endingHashKey));
+ return true;
Review comment:
Just for easier code readability, can we rewrite this as:
```
if (!lastSequenceNum.isAggregated()) {
return true;
}
return !record.getSequenceNumber().equals(lastSequenceNum.getSequenceNumber()) ||
record.getSubSequenceNumber() > lastSequenceNum.getSubSequenceNumber();
```
I've found early returns always helps with understanding these :)
##########
File path: flink-connectors/flink-connector-kinesis/src/main/java/org/apache/flink/streaming/connectors/kinesis/internals/publisher/RecordBatch.java
##########
@@ -0,0 +1,83 @@
+/*
+ * 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.flink.streaming.connectors.kinesis.internals.publisher;
+
+import org.apache.flink.streaming.connectors.kinesis.model.StreamShardHandle;
+
+import com.amazonaws.services.kinesis.clientlibrary.types.UserRecord;
+import com.amazonaws.services.kinesis.model.Record;
+
+import javax.annotation.Nullable;
+
+import java.math.BigInteger;
+import java.util.List;
+
+/**
+ * A batch of UserRecords received from Kinesis.
+ * Input records are de-aggregated using KCL 1.x library.
+ * It is expected that AWS SDK v2.x messages are converted to KCL 1.x {@link UserRecord}.
+ */
+public class RecordBatch {
+
+ private final int aggregatedRecordSize;
+
+ private final List<UserRecord> deaggregatedRecords;
+
+ private final long totalSizeInBytes;
+
+ private final Long millisBehindLatest;
+
+ public RecordBatch(final List<Record> records, final StreamShardHandle subscribedShard, final Long millisBehindLatest) {
+ this.aggregatedRecordSize = records.size();
Review comment:
Argument sanity / precondition checks.
##########
File path: flink-connectors/flink-connector-kinesis/src/main/java/org/apache/flink/streaming/connectors/kinesis/internals/publisher/polling/AdaptivePollingRecordPublisher.java
##########
@@ -0,0 +1,130 @@
+/*
+ * 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.flink.streaming.connectors.kinesis.internals.publisher.polling;
+
+import org.apache.flink.annotation.Internal;
+import org.apache.flink.streaming.connectors.kinesis.config.ConsumerConfigConstants;
+import org.apache.flink.streaming.connectors.kinesis.internals.publisher.RecordBatch;
+import org.apache.flink.streaming.connectors.kinesis.metrics.PollingRecordPublisherMetricsReporter;
+import org.apache.flink.streaming.connectors.kinesis.model.StartingPosition;
+import org.apache.flink.streaming.connectors.kinesis.model.StreamShardHandle;
+import org.apache.flink.streaming.connectors.kinesis.proxy.KinesisProxyInterface;
+
+import java.util.function.Consumer;
+
+/**
+ * An adaptive record publisher to add a dynamic loop delay and batch read size for {@link PollingRecordPublisher}.
+ * Kinesis Streams have quotas on the transactions per second, and throughout. This class attempts to balance
+ * quotas and mitigate back off errors.
+ */
+@Internal
+public class AdaptivePollingRecordPublisher extends PollingRecordPublisher {
+ // AWS Kinesis has a read limit of 2 Mb/sec
+ // https://docs.aws.amazon.com/kinesis/latest/APIReference/API_GetRecords.html
+ private static final long KINESIS_SHARD_BYTES_PER_SECOND_LIMIT = 2 * 1024L * 1024L;
+
+ private int lastRecordBatchSize = 0;
+
+ private long lastRecordBatchSizeInBytes = 0;
+
+ private long processingStartTimeNanos = System.nanoTime();
+
+ private int maxNumberOfRecordsPerFetch;
+
+ private final long fetchIntervalMillis;
+
+ private final PollingRecordPublisherMetricsReporter metricsReporter;
+
+ public AdaptivePollingRecordPublisher(
Review comment:
constructor can be package-private
##########
File path: flink-connectors/flink-connector-kinesis/src/main/java/org/apache/flink/streaming/connectors/kinesis/internals/publisher/RecordPublisher.java
##########
@@ -0,0 +1,52 @@
+/*
+ * 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.flink.streaming.connectors.kinesis.internals.publisher;
+
+import org.apache.flink.annotation.Internal;
+import org.apache.flink.streaming.connectors.kinesis.model.StartingPosition;
+
+import java.util.function.Consumer;
+
+/**
+ * A {@code RecordPublisher} will consume records from an external stream and deliver them to the registered subscriber.
+ */
+@Internal
+public interface RecordPublisher {
+
+ /**
+ * Run the record publisher. Records will be consumed from the stream and published to the consumer.
+ * The number of batches retrieved by a single invocation will vary based on implementation.
+ *
+ * @param startingPosition the position in the stream from which to consume
+ * @param recordConsumer the record consumer in which to output records
+ * @return a status enum to represent whether a shard has been fully consumed
+ * @throws InterruptedException
+ */
+ RecordPublisherRunResult run(StartingPosition startingPosition, Consumer<RecordBatch> recordConsumer) throws InterruptedException;
Review comment:
I found that the argument `StartingPosition` was slightly confusing to be passed in here, since from the implementations it seem like this `startingPosition` is only ever used on the first getRecords call, but with this interface we would be passing in the starting position on every invocation.
It's also slightly more error-prone for the call site of `RecordPublisher`s, imagine if the call site continued to invoke `run` with a starting position, after the previous attempt already returned `COMPLETE` as a result.
As a food for thought: having the `StartingPosition` passed in via the `RecordPublisherFactory` could potentially be a better option?
##########
File path: flink-connectors/flink-connector-kinesis/src/main/java/org/apache/flink/streaming/connectors/kinesis/model/StartingPosition.java
##########
@@ -0,0 +1,106 @@
+/*
+ * 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.flink.streaming.connectors.kinesis.model;
+
+import com.amazonaws.services.kinesis.model.ShardIteratorType;
+
+import javax.annotation.Nullable;
+
+import java.util.Date;
+
+import static com.amazonaws.services.kinesis.model.ShardIteratorType.AFTER_SEQUENCE_NUMBER;
+import static com.amazonaws.services.kinesis.model.ShardIteratorType.AT_SEQUENCE_NUMBER;
+import static com.amazonaws.services.kinesis.model.ShardIteratorType.AT_TIMESTAMP;
+import static com.amazonaws.services.kinesis.model.ShardIteratorType.LATEST;
+import static com.amazonaws.services.kinesis.model.ShardIteratorType.TRIM_HORIZON;
+import static org.apache.flink.streaming.connectors.kinesis.model.SentinelSequenceNumber.isSentinelSequenceNumber;
+
+/**
+ * The position in which to start consuming from a stream.
+ */
+public class StartingPosition {
Review comment:
Mark with `@Internal`
##########
File path: flink-connectors/flink-connector-kinesis/src/main/java/org/apache/flink/streaming/connectors/kinesis/internals/ShardConsumer.java
##########
@@ -53,283 +49,111 @@
*/
@Internal
public class ShardConsumer<T> implements Runnable {
-
- private static final Logger LOG = LoggerFactory.getLogger(ShardConsumer.class);
-
- // AWS Kinesis has a read limit of 2 Mb/sec
- // https://docs.aws.amazon.com/kinesis/latest/APIReference/API_GetRecords.html
- private static final long KINESIS_SHARD_BYTES_PER_SECOND_LIMIT = 2 * 1024L * 1024L;
-
private final KinesisDeserializationSchema<T> deserializer;
- private final KinesisProxyInterface kinesis;
-
private final int subscribedShardStateIndex;
private final KinesisDataFetcher<T> fetcherRef;
private final StreamShardHandle subscribedShard;
- private int maxNumberOfRecordsPerFetch;
- private final long fetchIntervalMillis;
- private final boolean useAdaptiveReads;
+ private final ShardConsumerMetricsReporter shardConsumerMetricsReporter;
- private final ShardMetricsReporter shardMetricsReporter;
+ private StartingPosition startingPosition;
private SequenceNumber lastSequenceNum;
- private Date initTimestamp;
+ private final RecordPublisher recordPublisher;
/**
* Creates a shard consumer.
*
* @param fetcherRef reference to the owning fetcher
+ * @param recordPublisher the record publisher used to read records from kinesis
* @param subscribedShardStateIndex the state index of the shard this consumer is subscribed to
* @param subscribedShard the shard this consumer is subscribed to
* @param lastSequenceNum the sequence number in the shard to start consuming
- * @param kinesis the proxy instance to interact with Kinesis
- * @param shardMetricsReporter the reporter to report metrics to
+ * @param shardConsumerMetricsReporter the reporter to report metrics to
+ * @param shardDeserializer used to deserialize incoming records
*/
public ShardConsumer(KinesisDataFetcher<T> fetcherRef,
+ RecordPublisher recordPublisher,
Integer subscribedShardStateIndex,
StreamShardHandle subscribedShard,
SequenceNumber lastSequenceNum,
- KinesisProxyInterface kinesis,
- ShardMetricsReporter shardMetricsReporter,
+ ShardConsumerMetricsReporter shardConsumerMetricsReporter,
KinesisDeserializationSchema<T> shardDeserializer) {
this.fetcherRef = checkNotNull(fetcherRef);
+ this.recordPublisher = checkNotNull(recordPublisher);
this.subscribedShardStateIndex = checkNotNull(subscribedShardStateIndex);
this.subscribedShard = checkNotNull(subscribedShard);
+ this.shardConsumerMetricsReporter = checkNotNull(shardConsumerMetricsReporter);
this.lastSequenceNum = checkNotNull(lastSequenceNum);
- this.shardMetricsReporter = checkNotNull(shardMetricsReporter);
-
checkArgument(
!lastSequenceNum.equals(SentinelSequenceNumber.SENTINEL_SHARD_ENDING_SEQUENCE_NUM.get()),
"Should not start a ShardConsumer if the shard has already been completely read.");
this.deserializer = shardDeserializer;
Properties consumerConfig = fetcherRef.getConsumerConfiguration();
- this.kinesis = kinesis;
- this.maxNumberOfRecordsPerFetch = Integer.valueOf(consumerConfig.getProperty(
- ConsumerConfigConstants.SHARD_GETRECORDS_MAX,
- Integer.toString(ConsumerConfigConstants.DEFAULT_SHARD_GETRECORDS_MAX)));
- this.fetchIntervalMillis = Long.valueOf(consumerConfig.getProperty(
- ConsumerConfigConstants.SHARD_GETRECORDS_INTERVAL_MILLIS,
- Long.toString(ConsumerConfigConstants.DEFAULT_SHARD_GETRECORDS_INTERVAL_MILLIS)));
- this.useAdaptiveReads = Boolean.valueOf(consumerConfig.getProperty(
- ConsumerConfigConstants.SHARD_USE_ADAPTIVE_READS,
- Boolean.toString(ConsumerConfigConstants.DEFAULT_SHARD_USE_ADAPTIVE_READS)));
-
- if (lastSequenceNum.equals(SentinelSequenceNumber.SENTINEL_AT_TIMESTAMP_SEQUENCE_NUM.get())) {
+
+ if (lastSequenceNum.equals(SENTINEL_AT_TIMESTAMP_SEQUENCE_NUM.get())) {
+ Date initTimestamp;
String timestamp = consumerConfig.getProperty(ConsumerConfigConstants.STREAM_INITIAL_TIMESTAMP);
try {
String format = consumerConfig.getProperty(ConsumerConfigConstants.STREAM_TIMESTAMP_DATE_FORMAT,
ConsumerConfigConstants.DEFAULT_STREAM_TIMESTAMP_DATE_FORMAT);
SimpleDateFormat customDateFormat = new SimpleDateFormat(format);
- this.initTimestamp = customDateFormat.parse(timestamp);
+ initTimestamp = customDateFormat.parse(timestamp);
} catch (IllegalArgumentException | NullPointerException exception) {
throw new IllegalArgumentException(exception);
} catch (ParseException exception) {
- this.initTimestamp = new Date((long) (Double.parseDouble(timestamp) * 1000));
+ initTimestamp = new Date((long) (Double.parseDouble(timestamp) * 1000));
}
- } else {
- this.initTimestamp = null;
- }
- }
-
- /**
- * Returns a shard iterator for the given {@link SequenceNumber}.
- *
- * @return shard iterator
- * @throws Exception
- */
- protected String getShardIterator(SequenceNumber sequenceNumber) throws Exception {
- if (isSentinelSequenceNumber(sequenceNumber)) {
- return getShardIteratorForSentinel(sequenceNumber);
+ startingPosition = StartingPosition.fromTimestamp(initTimestamp);
} else {
- // we will be starting from an actual sequence number (due to restore from failure).
- return getShardIteratorForRealSequenceNumber(sequenceNumber);
+ startingPosition = StartingPosition.restartFromSequenceNumber(checkNotNull(lastSequenceNum));
}
}
- protected String getShardIteratorForSentinel(SequenceNumber sentinelSequenceNumber) throws InterruptedException {
- String nextShardItr;
-
- if (sentinelSequenceNumber.equals(SentinelSequenceNumber.SENTINEL_LATEST_SEQUENCE_NUM.get())) {
- // if the shard is already closed, there will be no latest next record to get for this shard
- if (subscribedShard.isClosed()) {
- nextShardItr = null;
- } else {
- nextShardItr = kinesis.getShardIterator(subscribedShard, ShardIteratorType.LATEST.toString(), null);
- }
- } else if (sentinelSequenceNumber.equals(SentinelSequenceNumber.SENTINEL_EARLIEST_SEQUENCE_NUM.get())) {
- nextShardItr = kinesis.getShardIterator(subscribedShard, ShardIteratorType.TRIM_HORIZON.toString(), null);
- } else if (sentinelSequenceNumber.equals(SentinelSequenceNumber.SENTINEL_SHARD_ENDING_SEQUENCE_NUM.get())) {
- nextShardItr = null;
- } else if (sentinelSequenceNumber.equals(SentinelSequenceNumber.SENTINEL_AT_TIMESTAMP_SEQUENCE_NUM.get())) {
- nextShardItr = kinesis.getShardIterator(subscribedShard, ShardIteratorType.AT_TIMESTAMP.toString(), initTimestamp);
- } else {
- throw new RuntimeException("Unknown sentinel type: " + sentinelSequenceNumber);
- }
-
- return nextShardItr;
- }
-
- protected String getShardIteratorForRealSequenceNumber(SequenceNumber sequenceNumber)
- throws Exception {
-
- // if the last sequence number refers to an aggregated record, we need to clean up any dangling sub-records
- // from the last aggregated record; otherwise, we can simply start iterating from the record right after.
-
- if (sequenceNumber.isAggregated()) {
- return getShardIteratorForAggregatedSequenceNumber(sequenceNumber);
- } else {
- // the last record was non-aggregated, so we can simply start from the next record
- return kinesis.getShardIterator(
- subscribedShard,
- ShardIteratorType.AFTER_SEQUENCE_NUMBER.toString(),
- sequenceNumber.getSequenceNumber());
- }
- }
-
- protected String getShardIteratorForAggregatedSequenceNumber(SequenceNumber sequenceNumber)
- throws Exception {
-
- String itrForLastAggregatedRecord =
- kinesis.getShardIterator(
- subscribedShard,
- ShardIteratorType.AT_SEQUENCE_NUMBER.toString(),
- sequenceNumber.getSequenceNumber());
-
- // get only the last aggregated record
- GetRecordsResult getRecordsResult = getRecords(itrForLastAggregatedRecord, 1);
-
- List<UserRecord> fetchedRecords = deaggregateRecords(
- getRecordsResult.getRecords(),
- subscribedShard.getShard().getHashKeyRange().getStartingHashKey(),
- subscribedShard.getShard().getHashKeyRange().getEndingHashKey());
-
- long lastSubSequenceNum = sequenceNumber.getSubSequenceNumber();
- for (UserRecord record : fetchedRecords) {
- // we have found a dangling sub-record if it has a larger subsequence number
- // than our last sequence number; if so, collect the record and update state
- if (record.getSubSequenceNumber() > lastSubSequenceNum) {
- deserializeRecordForCollectionAndUpdateState(record);
- }
- }
-
- return getRecordsResult.getNextShardIterator();
- }
-
- @SuppressWarnings("unchecked")
@Override
public void run() {
try {
- String nextShardItr = getShardIterator(lastSequenceNum);
+ while (isRunning()) {
+ final RecordPublisherRunResult result = recordPublisher.run(startingPosition, batch -> {
+ for (UserRecord userRecord : batch.getDeaggregatedRecords()) {
+ if (filterDeaggregatedRecord(userRecord)) {
+ deserializeRecordForCollectionAndUpdateState(userRecord);
+ }
+ }
- long processingStartTimeNanos = System.nanoTime();
+ shardConsumerMetricsReporter.setAverageRecordSizeBytes(batch.getAverageRecordSizeBytes());
+ shardConsumerMetricsReporter.setNumberOfAggregatedRecords(batch.getAggregatedRecordSize());
+ shardConsumerMetricsReporter.setNumberOfDeaggregatedRecords(batch.getDeaggregatedRecordSize());
+ ofNullable(batch.getMillisBehindLatest()).ifPresent(shardConsumerMetricsReporter::setMillisBehindLatest);
+ });
- while (isRunning()) {
- if (nextShardItr == null) {
+ if (result == COMPLETE) {
fetcherRef.updateState(subscribedShardStateIndex, SentinelSequenceNumber.SENTINEL_SHARD_ENDING_SEQUENCE_NUM.get());
// we can close this consumer thread once we've reached the end of the subscribed shard
break;
} else {
- shardMetricsReporter.setMaxNumberOfRecordsPerFetch(maxNumberOfRecordsPerFetch);
- GetRecordsResult getRecordsResult = getRecords(nextShardItr, maxNumberOfRecordsPerFetch);
-
- List<Record> aggregatedRecords = getRecordsResult.getRecords();
- int numberOfAggregatedRecords = aggregatedRecords.size();
- shardMetricsReporter.setNumberOfAggregatedRecords(numberOfAggregatedRecords);
-
- // each of the Kinesis records may be aggregated, so we must deaggregate them before proceeding
- List<UserRecord> fetchedRecords = deaggregateRecords(
- aggregatedRecords,
- subscribedShard.getShard().getHashKeyRange().getStartingHashKey(),
- subscribedShard.getShard().getHashKeyRange().getEndingHashKey());
-
- long recordBatchSizeBytes = 0L;
- for (UserRecord record : fetchedRecords) {
- recordBatchSizeBytes += record.getData().remaining();
- deserializeRecordForCollectionAndUpdateState(record);
- }
-
- int numberOfDeaggregatedRecords = fetchedRecords.size();
- shardMetricsReporter.setNumberOfDeaggregatedRecords(numberOfDeaggregatedRecords);
-
- nextShardItr = getRecordsResult.getNextShardIterator();
-
- long adjustmentEndTimeNanos = adjustRunLoopFrequency(processingStartTimeNanos, System.nanoTime());
- long runLoopTimeNanos = adjustmentEndTimeNanos - processingStartTimeNanos;
- maxNumberOfRecordsPerFetch = adaptRecordsToRead(runLoopTimeNanos, fetchedRecords.size(), recordBatchSizeBytes, maxNumberOfRecordsPerFetch);
- shardMetricsReporter.setRunLoopTimeNanos(runLoopTimeNanos);
- processingStartTimeNanos = adjustmentEndTimeNanos; // for next time through the loop
+ startingPosition = StartingPosition.continueFromSequenceNumber(lastSequenceNum);
Review comment:
Why does the `ShardConsumer` need to keep track and update the `startingPosition`?
It feels like this should be an internal state to the record publisher, and also as how I understand it, the record publisher only ever respects the `nextShardItr` that it maintains.
##########
File path: flink-connectors/flink-connector-kinesis/src/main/java/org/apache/flink/streaming/connectors/kinesis/internals/ShardConsumer.java
##########
@@ -53,283 +49,111 @@
*/
@Internal
public class ShardConsumer<T> implements Runnable {
-
- private static final Logger LOG = LoggerFactory.getLogger(ShardConsumer.class);
-
- // AWS Kinesis has a read limit of 2 Mb/sec
- // https://docs.aws.amazon.com/kinesis/latest/APIReference/API_GetRecords.html
- private static final long KINESIS_SHARD_BYTES_PER_SECOND_LIMIT = 2 * 1024L * 1024L;
-
private final KinesisDeserializationSchema<T> deserializer;
- private final KinesisProxyInterface kinesis;
-
private final int subscribedShardStateIndex;
private final KinesisDataFetcher<T> fetcherRef;
private final StreamShardHandle subscribedShard;
- private int maxNumberOfRecordsPerFetch;
- private final long fetchIntervalMillis;
- private final boolean useAdaptiveReads;
+ private final ShardConsumerMetricsReporter shardConsumerMetricsReporter;
- private final ShardMetricsReporter shardMetricsReporter;
+ private StartingPosition startingPosition;
private SequenceNumber lastSequenceNum;
- private Date initTimestamp;
+ private final RecordPublisher recordPublisher;
/**
* Creates a shard consumer.
*
* @param fetcherRef reference to the owning fetcher
+ * @param recordPublisher the record publisher used to read records from kinesis
* @param subscribedShardStateIndex the state index of the shard this consumer is subscribed to
* @param subscribedShard the shard this consumer is subscribed to
* @param lastSequenceNum the sequence number in the shard to start consuming
- * @param kinesis the proxy instance to interact with Kinesis
- * @param shardMetricsReporter the reporter to report metrics to
+ * @param shardConsumerMetricsReporter the reporter to report metrics to
+ * @param shardDeserializer used to deserialize incoming records
*/
public ShardConsumer(KinesisDataFetcher<T> fetcherRef,
+ RecordPublisher recordPublisher,
Integer subscribedShardStateIndex,
StreamShardHandle subscribedShard,
SequenceNumber lastSequenceNum,
- KinesisProxyInterface kinesis,
- ShardMetricsReporter shardMetricsReporter,
+ ShardConsumerMetricsReporter shardConsumerMetricsReporter,
KinesisDeserializationSchema<T> shardDeserializer) {
this.fetcherRef = checkNotNull(fetcherRef);
+ this.recordPublisher = checkNotNull(recordPublisher);
this.subscribedShardStateIndex = checkNotNull(subscribedShardStateIndex);
this.subscribedShard = checkNotNull(subscribedShard);
+ this.shardConsumerMetricsReporter = checkNotNull(shardConsumerMetricsReporter);
this.lastSequenceNum = checkNotNull(lastSequenceNum);
- this.shardMetricsReporter = checkNotNull(shardMetricsReporter);
-
checkArgument(
!lastSequenceNum.equals(SentinelSequenceNumber.SENTINEL_SHARD_ENDING_SEQUENCE_NUM.get()),
"Should not start a ShardConsumer if the shard has already been completely read.");
this.deserializer = shardDeserializer;
Properties consumerConfig = fetcherRef.getConsumerConfiguration();
- this.kinesis = kinesis;
- this.maxNumberOfRecordsPerFetch = Integer.valueOf(consumerConfig.getProperty(
- ConsumerConfigConstants.SHARD_GETRECORDS_MAX,
- Integer.toString(ConsumerConfigConstants.DEFAULT_SHARD_GETRECORDS_MAX)));
- this.fetchIntervalMillis = Long.valueOf(consumerConfig.getProperty(
- ConsumerConfigConstants.SHARD_GETRECORDS_INTERVAL_MILLIS,
- Long.toString(ConsumerConfigConstants.DEFAULT_SHARD_GETRECORDS_INTERVAL_MILLIS)));
- this.useAdaptiveReads = Boolean.valueOf(consumerConfig.getProperty(
- ConsumerConfigConstants.SHARD_USE_ADAPTIVE_READS,
- Boolean.toString(ConsumerConfigConstants.DEFAULT_SHARD_USE_ADAPTIVE_READS)));
-
- if (lastSequenceNum.equals(SentinelSequenceNumber.SENTINEL_AT_TIMESTAMP_SEQUENCE_NUM.get())) {
+
+ if (lastSequenceNum.equals(SENTINEL_AT_TIMESTAMP_SEQUENCE_NUM.get())) {
+ Date initTimestamp;
String timestamp = consumerConfig.getProperty(ConsumerConfigConstants.STREAM_INITIAL_TIMESTAMP);
try {
String format = consumerConfig.getProperty(ConsumerConfigConstants.STREAM_TIMESTAMP_DATE_FORMAT,
ConsumerConfigConstants.DEFAULT_STREAM_TIMESTAMP_DATE_FORMAT);
SimpleDateFormat customDateFormat = new SimpleDateFormat(format);
- this.initTimestamp = customDateFormat.parse(timestamp);
+ initTimestamp = customDateFormat.parse(timestamp);
} catch (IllegalArgumentException | NullPointerException exception) {
throw new IllegalArgumentException(exception);
} catch (ParseException exception) {
- this.initTimestamp = new Date((long) (Double.parseDouble(timestamp) * 1000));
+ initTimestamp = new Date((long) (Double.parseDouble(timestamp) * 1000));
}
- } else {
- this.initTimestamp = null;
- }
- }
-
- /**
- * Returns a shard iterator for the given {@link SequenceNumber}.
- *
- * @return shard iterator
- * @throws Exception
- */
- protected String getShardIterator(SequenceNumber sequenceNumber) throws Exception {
- if (isSentinelSequenceNumber(sequenceNumber)) {
- return getShardIteratorForSentinel(sequenceNumber);
+ startingPosition = StartingPosition.fromTimestamp(initTimestamp);
} else {
- // we will be starting from an actual sequence number (due to restore from failure).
- return getShardIteratorForRealSequenceNumber(sequenceNumber);
+ startingPosition = StartingPosition.restartFromSequenceNumber(checkNotNull(lastSequenceNum));
}
}
- protected String getShardIteratorForSentinel(SequenceNumber sentinelSequenceNumber) throws InterruptedException {
Review comment:
👍 really nice to see this go away :)
##########
File path: flink-connectors/flink-connector-kinesis/src/main/java/org/apache/flink/streaming/connectors/kinesis/internals/publisher/polling/AdaptivePollingRecordPublisher.java
##########
@@ -0,0 +1,130 @@
+/*
+ * 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.flink.streaming.connectors.kinesis.internals.publisher.polling;
+
+import org.apache.flink.annotation.Internal;
+import org.apache.flink.streaming.connectors.kinesis.config.ConsumerConfigConstants;
+import org.apache.flink.streaming.connectors.kinesis.internals.publisher.RecordBatch;
+import org.apache.flink.streaming.connectors.kinesis.metrics.PollingRecordPublisherMetricsReporter;
+import org.apache.flink.streaming.connectors.kinesis.model.StartingPosition;
+import org.apache.flink.streaming.connectors.kinesis.model.StreamShardHandle;
+import org.apache.flink.streaming.connectors.kinesis.proxy.KinesisProxyInterface;
+
+import java.util.function.Consumer;
+
+/**
+ * An adaptive record publisher to add a dynamic loop delay and batch read size for {@link PollingRecordPublisher}.
+ * Kinesis Streams have quotas on the transactions per second, and throughout. This class attempts to balance
+ * quotas and mitigate back off errors.
+ */
+@Internal
+public class AdaptivePollingRecordPublisher extends PollingRecordPublisher {
Review comment:
👍 really like the approach you took in refactoring this.
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