Java Code Examples for org.apache.flink.streaming.connectors.kinesis.internals.KinesisDataFetcher#runFetcher()

The following examples show how to use org.apache.flink.streaming.connectors.kinesis.internals.KinesisDataFetcher#runFetcher() . You can vote up the ones you like or vote down the ones you don't like, and go to the original project or source file by following the links above each example. You may check out the related API usage on the sidebar.

Example 1

Source File: FlinkKinesisConsumer.java From Flink-CEPplus with Apache License 2.0

4 votes

@Override
public void run(SourceContext<T> sourceContext) throws Exception {

	// all subtasks will run a fetcher, regardless of whether or not the subtask will initially have
	// shards to subscribe to; fetchers will continuously poll for changes in the shard list, so all subtasks
	// can potentially have new shards to subscribe to later on
	KinesisDataFetcher<T> fetcher = createFetcher(streams, sourceContext, getRuntimeContext(), configProps, deserializer);

	// initial discovery
	List<StreamShardHandle> allShards = fetcher.discoverNewShardsToSubscribe();

	for (StreamShardHandle shard : allShards) {
		StreamShardMetadata.EquivalenceWrapper kinesisStreamShard =
			new StreamShardMetadata.EquivalenceWrapper(KinesisDataFetcher.convertToStreamShardMetadata(shard));

		if (sequenceNumsToRestore != null) {

			if (sequenceNumsToRestore.containsKey(kinesisStreamShard)) {
				// if the shard was already seen and is contained in the state,
				// just use the sequence number stored in the state
				fetcher.registerNewSubscribedShardState(
					new KinesisStreamShardState(kinesisStreamShard.getShardMetadata(), shard, sequenceNumsToRestore.get(kinesisStreamShard)));

				if (LOG.isInfoEnabled()) {
					LOG.info("Subtask {} is seeding the fetcher with restored shard {}," +
							" starting state set to the restored sequence number {}",
						getRuntimeContext().getIndexOfThisSubtask(), shard.toString(), sequenceNumsToRestore.get(kinesisStreamShard));
				}
			} else {
				// the shard wasn't discovered in the previous run, therefore should be consumed from the beginning
				fetcher.registerNewSubscribedShardState(
					new KinesisStreamShardState(kinesisStreamShard.getShardMetadata(), shard, SentinelSequenceNumber.SENTINEL_EARLIEST_SEQUENCE_NUM.get()));

				if (LOG.isInfoEnabled()) {
					LOG.info("Subtask {} is seeding the fetcher with new discovered shard {}," +
							" starting state set to the SENTINEL_EARLIEST_SEQUENCE_NUM",
						getRuntimeContext().getIndexOfThisSubtask(), shard.toString());
				}
			}
		} else {
			// we're starting fresh; use the configured start position as initial state
			SentinelSequenceNumber startingSeqNum =
				InitialPosition.valueOf(configProps.getProperty(
					ConsumerConfigConstants.STREAM_INITIAL_POSITION,
					ConsumerConfigConstants.DEFAULT_STREAM_INITIAL_POSITION)).toSentinelSequenceNumber();

			fetcher.registerNewSubscribedShardState(
				new KinesisStreamShardState(kinesisStreamShard.getShardMetadata(), shard, startingSeqNum.get()));

			if (LOG.isInfoEnabled()) {
				LOG.info("Subtask {} will be seeded with initial shard {}, starting state set as sequence number {}",
					getRuntimeContext().getIndexOfThisSubtask(), shard.toString(), startingSeqNum.get());
			}
		}
	}

	// check that we are running before starting the fetcher
	if (!running) {
		return;
	}

	// expose the fetcher from this point, so that state
	// snapshots can be taken from the fetcher's state holders
	this.fetcher = fetcher;

	// start the fetcher loop. The fetcher will stop running only when cancel() or
	// close() is called, or an error is thrown by threads created by the fetcher
	fetcher.runFetcher();

	// check that the fetcher has terminated before fully closing
	fetcher.awaitTermination();
	sourceContext.close();
}

Example 2

Source File: FlinkKinesisConsumer.java From flink with Apache License 2.0

4 votes

@Override
public void run(SourceContext<T> sourceContext) throws Exception {

	// all subtasks will run a fetcher, regardless of whether or not the subtask will initially have
	// shards to subscribe to; fetchers will continuously poll for changes in the shard list, so all subtasks
	// can potentially have new shards to subscribe to later on
	KinesisDataFetcher<T> fetcher = createFetcher(streams, sourceContext, getRuntimeContext(), configProps, deserializer);

	// initial discovery
	List<StreamShardHandle> allShards = fetcher.discoverNewShardsToSubscribe();

	for (StreamShardHandle shard : allShards) {
		StreamShardMetadata.EquivalenceWrapper kinesisStreamShard =
			new StreamShardMetadata.EquivalenceWrapper(KinesisDataFetcher.convertToStreamShardMetadata(shard));

		if (sequenceNumsToRestore != null) {

			if (sequenceNumsToRestore.containsKey(kinesisStreamShard)) {
				// if the shard was already seen and is contained in the state,
				// just use the sequence number stored in the state
				fetcher.registerNewSubscribedShardState(
					new KinesisStreamShardState(kinesisStreamShard.getShardMetadata(), shard, sequenceNumsToRestore.get(kinesisStreamShard)));

				if (LOG.isInfoEnabled()) {
					LOG.info("Subtask {} is seeding the fetcher with restored shard {}," +
							" starting state set to the restored sequence number {}",
						getRuntimeContext().getIndexOfThisSubtask(), shard.toString(), sequenceNumsToRestore.get(kinesisStreamShard));
				}
			} else {
				// the shard wasn't discovered in the previous run, therefore should be consumed from the beginning
				fetcher.registerNewSubscribedShardState(
					new KinesisStreamShardState(kinesisStreamShard.getShardMetadata(), shard, SentinelSequenceNumber.SENTINEL_EARLIEST_SEQUENCE_NUM.get()));

				if (LOG.isInfoEnabled()) {
					LOG.info("Subtask {} is seeding the fetcher with new discovered shard {}," +
							" starting state set to the SENTINEL_EARLIEST_SEQUENCE_NUM",
						getRuntimeContext().getIndexOfThisSubtask(), shard.toString());
				}
			}
		} else {
			// we're starting fresh; use the configured start position as initial state
			SentinelSequenceNumber startingSeqNum =
				InitialPosition.valueOf(configProps.getProperty(
					ConsumerConfigConstants.STREAM_INITIAL_POSITION,
					ConsumerConfigConstants.DEFAULT_STREAM_INITIAL_POSITION)).toSentinelSequenceNumber();

			fetcher.registerNewSubscribedShardState(
				new KinesisStreamShardState(kinesisStreamShard.getShardMetadata(), shard, startingSeqNum.get()));

			if (LOG.isInfoEnabled()) {
				LOG.info("Subtask {} will be seeded with initial shard {}, starting state set as sequence number {}",
					getRuntimeContext().getIndexOfThisSubtask(), shard.toString(), startingSeqNum.get());
			}
		}
	}

	// check that we are running before starting the fetcher
	if (!running) {
		return;
	}

	// expose the fetcher from this point, so that state
	// snapshots can be taken from the fetcher's state holders
	this.fetcher = fetcher;

	// start the fetcher loop. The fetcher will stop running only when cancel() or
	// close() is called, or an error is thrown by threads created by the fetcher
	fetcher.runFetcher();

	// check that the fetcher has terminated before fully closing
	fetcher.awaitTermination();
	sourceContext.close();
}

Example 3

Source File: FlinkKinesisConsumer.java From flink with Apache License 2.0

4 votes

@Override
public void run(SourceContext<T> sourceContext) throws Exception {

	// all subtasks will run a fetcher, regardless of whether or not the subtask will initially have
	// shards to subscribe to; fetchers will continuously poll for changes in the shard list, so all subtasks
	// can potentially have new shards to subscribe to later on
	KinesisDataFetcher<T> fetcher = createFetcher(streams, sourceContext, getRuntimeContext(), configProps, deserializer);

	// initial discovery
	List<StreamShardHandle> allShards = fetcher.discoverNewShardsToSubscribe();

	for (StreamShardHandle shard : allShards) {
		StreamShardMetadata.EquivalenceWrapper kinesisStreamShard =
			new StreamShardMetadata.EquivalenceWrapper(KinesisDataFetcher.convertToStreamShardMetadata(shard));

		if (sequenceNumsToRestore != null) {

			if (sequenceNumsToRestore.containsKey(kinesisStreamShard)) {
				// if the shard was already seen and is contained in the state,
				// just use the sequence number stored in the state
				fetcher.registerNewSubscribedShardState(
					new KinesisStreamShardState(kinesisStreamShard.getShardMetadata(), shard, sequenceNumsToRestore.get(kinesisStreamShard)));

				if (LOG.isInfoEnabled()) {
					LOG.info("Subtask {} is seeding the fetcher with restored shard {}," +
							" starting state set to the restored sequence number {}",
						getRuntimeContext().getIndexOfThisSubtask(), shard.toString(), sequenceNumsToRestore.get(kinesisStreamShard));
				}
			} else {
				// the shard wasn't discovered in the previous run, therefore should be consumed from the beginning
				fetcher.registerNewSubscribedShardState(
					new KinesisStreamShardState(kinesisStreamShard.getShardMetadata(), shard, SentinelSequenceNumber.SENTINEL_EARLIEST_SEQUENCE_NUM.get()));

				if (LOG.isInfoEnabled()) {
					LOG.info("Subtask {} is seeding the fetcher with new discovered shard {}," +
							" starting state set to the SENTINEL_EARLIEST_SEQUENCE_NUM",
						getRuntimeContext().getIndexOfThisSubtask(), shard.toString());
				}
			}
		} else {
			// we're starting fresh; use the configured start position as initial state
			SentinelSequenceNumber startingSeqNum =
				InitialPosition.valueOf(configProps.getProperty(
					ConsumerConfigConstants.STREAM_INITIAL_POSITION,
					ConsumerConfigConstants.DEFAULT_STREAM_INITIAL_POSITION)).toSentinelSequenceNumber();

			fetcher.registerNewSubscribedShardState(
				new KinesisStreamShardState(kinesisStreamShard.getShardMetadata(), shard, startingSeqNum.get()));

			if (LOG.isInfoEnabled()) {
				LOG.info("Subtask {} will be seeded with initial shard {}, starting state set as sequence number {}",
					getRuntimeContext().getIndexOfThisSubtask(), shard.toString(), startingSeqNum.get());
			}
		}
	}

	// check that we are running before starting the fetcher
	if (!running) {
		return;
	}

	// expose the fetcher from this point, so that state
	// snapshots can be taken from the fetcher's state holders
	this.fetcher = fetcher;

	// start the fetcher loop. The fetcher will stop running only when cancel() or
	// close() is called, or an error is thrown by threads created by the fetcher
	fetcher.runFetcher();

	// check that the fetcher has terminated before fully closing
	fetcher.awaitTermination();
	sourceContext.close();
}