npawar commented on a change in pull request #6661: URL: https://github.com/apache/incubator-pinot/pull/6661#discussion_r624603337
########## File path: pinot-plugins/pinot-stream-ingestion/pinot-kinesis/src/main/java/org/apache/pinot/plugin/stream/kinesis/KinesisConsumer.java ########## @@ -0,0 +1,194 @@ +/** + * 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.pinot.plugin.stream.kinesis; + +import java.util.ArrayList; +import java.util.HashMap; +import java.util.List; +import java.util.Map; +import java.util.concurrent.ExecutorService; +import java.util.concurrent.Executors; +import java.util.concurrent.Future; +import java.util.concurrent.TimeUnit; +import org.apache.pinot.spi.stream.PartitionGroupConsumer; +import org.apache.pinot.spi.stream.StreamPartitionMsgOffset; +import org.slf4j.Logger; +import org.slf4j.LoggerFactory; +import software.amazon.awssdk.services.kinesis.KinesisClient; +import software.amazon.awssdk.services.kinesis.model.ExpiredIteratorException; +import software.amazon.awssdk.services.kinesis.model.GetRecordsRequest; +import software.amazon.awssdk.services.kinesis.model.GetRecordsResponse; +import software.amazon.awssdk.services.kinesis.model.GetShardIteratorRequest; +import software.amazon.awssdk.services.kinesis.model.InvalidArgumentException; +import software.amazon.awssdk.services.kinesis.model.KinesisException; +import software.amazon.awssdk.services.kinesis.model.ProvisionedThroughputExceededException; +import software.amazon.awssdk.services.kinesis.model.Record; +import software.amazon.awssdk.services.kinesis.model.ResourceNotFoundException; +import software.amazon.awssdk.services.kinesis.model.ShardIteratorType; + + +/** + * A {@link PartitionGroupConsumer} implementation for the Kinesis stream + */ +public class KinesisConsumer extends KinesisConnectionHandler implements PartitionGroupConsumer { + private final Logger LOG = LoggerFactory.getLogger(KinesisConsumer.class); + private final String _stream; + private final int _maxRecords; + private final ExecutorService _executorService; + private final ShardIteratorType _shardIteratorType; + + public KinesisConsumer(KinesisConfig kinesisConfig) { + super(kinesisConfig.getStream(), kinesisConfig.getAwsRegion()); + _stream = kinesisConfig.getStream(); + _maxRecords = kinesisConfig.maxRecordsToFetch(); + _shardIteratorType = kinesisConfig.getShardIteratorType(); + _executorService = Executors.newSingleThreadExecutor(); + } + + public KinesisConsumer(KinesisConfig kinesisConfig, KinesisClient kinesisClient) { + super(kinesisConfig.getStream(), kinesisConfig.getAwsRegion(), kinesisClient); + _kinesisClient = kinesisClient; + _stream = kinesisConfig.getStream(); + _maxRecords = kinesisConfig.maxRecordsToFetch(); + _shardIteratorType = kinesisConfig.getShardIteratorType(); + _executorService = Executors.newSingleThreadExecutor(); + } + + /** + * Fetch records from the Kinesis stream between the start and end KinesisCheckpoint + */ + @Override + public KinesisRecordsBatch fetchMessages(StreamPartitionMsgOffset startCheckpoint, + StreamPartitionMsgOffset endCheckpoint, int timeoutMs) { + List<Record> recordList = new ArrayList<>(); + Future<KinesisRecordsBatch> kinesisFetchResultFuture = + _executorService.submit(() -> getResult(startCheckpoint, endCheckpoint, recordList)); + + try { + return kinesisFetchResultFuture.get(timeoutMs, TimeUnit.MILLISECONDS); + } catch (Exception e) { + return handleException((KinesisPartitionGroupOffset) startCheckpoint, recordList); + } + } + + private KinesisRecordsBatch getResult(StreamPartitionMsgOffset start, StreamPartitionMsgOffset end, + List<Record> recordList) { + KinesisPartitionGroupOffset kinesisStartCheckpoint = (KinesisPartitionGroupOffset) start; + + try { + + if (_kinesisClient == null) { + createConnection(); + } + + //TODO: iterate upon all the shardIds in the map + // Okay for now, since we have assumed that every partition group contains a single shard + Map.Entry<String, String> shardToSequenceNum = + kinesisStartCheckpoint.getShardToStartSequenceMap().entrySet().iterator().next(); + String shardIterator = getShardIterator(shardToSequenceNum.getKey(), shardToSequenceNum.getValue()); + + String kinesisEndSequenceNumber = null; + + if (end != null) { + KinesisPartitionGroupOffset kinesisEndCheckpoint = (KinesisPartitionGroupOffset) end; + kinesisEndSequenceNumber = kinesisEndCheckpoint.getShardToStartSequenceMap().values().iterator().next(); + } + + String nextStartSequenceNumber = null; + boolean isEndOfShard = false; + + while (shardIterator != null) { + GetRecordsRequest getRecordsRequest = GetRecordsRequest.builder().shardIterator(shardIterator).build(); + GetRecordsResponse getRecordsResponse = _kinesisClient.getRecords(getRecordsRequest); + + if (getRecordsResponse.records().size() > 0) { + recordList.addAll(getRecordsResponse.records()); + nextStartSequenceNumber = recordList.get(recordList.size() - 1).sequenceNumber(); + + if (kinesisEndSequenceNumber != null && kinesisEndSequenceNumber.compareTo(nextStartSequenceNumber) <= 0) { + nextStartSequenceNumber = kinesisEndSequenceNumber; Review comment: True. 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