org.apache.flink.streaming.runtime.tasks

Class OperatorChain<OUT>

java.lang.Object

org.apache.flink.streaming.runtime.tasks.OperatorChain<OUT>

Type Parameters:

OUT - The type of elements accepted by the chain, i.e., the input type of the chain's head operator.

@Internal
public class OperatorChain<OUT>
extends Object

The OperatorChain contains all operators that are executed as one chain within a single StreamTask.

Constructor Summary

Constructors

Constructor and Description
OperatorChain(StreamTask<OUT,?> containingTask, StreamOperator<OUT> headOperator, org.apache.flink.runtime.accumulators.AccumulatorRegistry.Reporter reporter)

Method Summary

Modifier and Type	Method and Description
void	broadcastCheckpointBarrier(long id, long timestamp)
void	flushOutputs() This method should be called before finishing the record emission, to make sure any data that is still buffered will be sent.
StreamOperator<?>[]	getAllOperators()
Output<StreamRecord<OUT>>	getChainEntryPoint()
RecordWriterOutput<?>[]	getStreamOutputs()
void	releaseOutputs() This method releases all resources of the record writer output.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

OperatorChain

public OperatorChain(StreamTask<OUT,?> containingTask,
                     StreamOperator<OUT> headOperator,
                     org.apache.flink.runtime.accumulators.AccumulatorRegistry.Reporter reporter)

Method Detail

broadcastCheckpointBarrier

public void broadcastCheckpointBarrier(long id,
                                       long timestamp)
                                throws IOException,
                                       InterruptedException

Throws:

IOException

InterruptedException

getStreamOutputs

public RecordWriterOutput<?>[] getStreamOutputs()

getAllOperators

public StreamOperator<?>[] getAllOperators()

getChainEntryPoint

public Output<StreamRecord<OUT>> getChainEntryPoint()

flushOutputs

public void flushOutputs()
                  throws IOException

This method should be called before finishing the record emission, to make sure any data that is still buffered will be sent. It also ensures that all data sending related exceptions are recognized.

Throws:

IOException - Thrown, if the buffered data cannot be pushed into the output streams.

releaseOutputs

public void releaseOutputs()

This method releases all resources of the record writer output. It stops the output flushing thread (if there is one) and releases all buffers currently held by the output serializers.

This method should never fail.