org.apache.flink.streaming.runtime.tasks

Class SourceOperatorStreamTask<T>

java.lang.Object

org.apache.flink.runtime.jobgraph.tasks.AbstractInvokable

org.apache.flink.streaming.runtime.tasks.StreamTask<T,SourceOperator<T,?>>

org.apache.flink.streaming.runtime.tasks.SourceOperatorStreamTask<T>

All Implemented Interfaces:

AsyncExceptionHandler

@Internal
public class SourceOperatorStreamTask<T>
extends StreamTask<T,SourceOperator<T,?>>

A subclass of StreamTask for executing the SourceOperator.

Field Summary

Fields inherited from class org.apache.flink.streaming.runtime.tasks.StreamTask

configuration, headOperator, inputProcessor, LOG, mailboxProcessor, operatorChain, stateBackend, timerService, TRIGGER_THREAD_GROUP

Constructor Summary

Constructors

Constructor and Description
SourceOperatorStreamTask(Environment env)

Method Summary

Modifier and Type	Method and Description
protected void	advanceToEndOfEventTime() Emits the MAX_WATERMARK so that all registered timers are fired.
protected void	afterInvoke()
protected CompletableFuture<Void>	getCompletionFuture()
void	init()
Future<Boolean>	triggerCheckpointAsync(CheckpointMetaData checkpointMetaData, CheckpointOptions checkpointOptions) This method is called to trigger a checkpoint, asynchronously by the checkpoint coordinator.

Methods inherited from class org.apache.flink.streaming.runtime.tasks.StreamTask

abortCheckpointOnBarrier, beforeInvoke, cancel, cancelTask, cleanup, cleanUpInvoke, createRecordWriterDelegate, createStreamTaskStateInitializer, declineCheckpoint, dispatchOperatorEvent, executeInTaskThread, finalize, finishTask, getAsyncCheckpointStartDelayNanos, getAsyncOperationsThreadPool, getCancelables, getCheckpointStorage, getConfiguration, getMailboxExecutorFactory, getName, getProcessingTimeServiceFactory, getStreamStatusMaintainer, handleAsyncException, invoke, isCanceled, isFailing, isMailboxLoopRunning, isRunning, notifyCheckpointAbortAsync, notifyCheckpointCompleteAsync, processInput, runMailboxStep, setupNumRecordsInCounter, toString, triggerCheckpointOnBarrier

Methods inherited from class org.apache.flink.runtime.jobgraph.tasks.AbstractInvokable

getCurrentNumberOfSubtasks, getEnvironment, getExecutionConfig, getIndexInSubtaskGroup, getJobConfiguration, getTaskConfiguration, getUserCodeClassLoader, setShouldInterruptOnCancel, shouldInterruptOnCancel

Methods inherited from class java.lang.Object

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

Constructor Detail

SourceOperatorStreamTask

public SourceOperatorStreamTask(Environment env)
                         throws Exception

Throws:

Exception

Method Detail

getCompletionFuture

protected CompletableFuture<Void> getCompletionFuture()

Overrides:

getCompletionFuture in class StreamTask<T,SourceOperator<T,?>>

init

public void init()
          throws Exception

Specified by:

init in class StreamTask<T,SourceOperator<T,?>>

Throws:

Exception

triggerCheckpointAsync

public Future<Boolean> triggerCheckpointAsync(CheckpointMetaData checkpointMetaData,
                                              CheckpointOptions checkpointOptions)

Description copied from class: AbstractInvokable

This method is called to trigger a checkpoint, asynchronously by the checkpoint coordinator.

This method is called for tasks that start the checkpoints by injecting the initial barriers, i.e., the source tasks. In contrast, checkpoints on downstream operators, which are the result of receiving checkpoint barriers, invoke the AbstractInvokable.triggerCheckpointOnBarrier(CheckpointMetaData, CheckpointOptions, CheckpointMetrics) method.

Overrides:

triggerCheckpointAsync in class StreamTask<T,SourceOperator<T,?>>

Parameters:

checkpointMetaData - Meta data for about this checkpoint

checkpointOptions - Options for performing this checkpoint

Returns:

future with value of false if the checkpoint was not carried out, true otherwise

advanceToEndOfEventTime

protected void advanceToEndOfEventTime()

Description copied from class: StreamTask

Emits the MAX_WATERMARK so that all registered timers are fired.

This is used by the source task when the job is TERMINATED. In the case, we want all the timers registered throughout the pipeline to fire and the related state (e.g. windows) to be flushed.

For tasks other than the source task, this method does nothing.

Overrides:

advanceToEndOfEventTime in class StreamTask<T,SourceOperator<T,?>>

afterInvoke

protected void afterInvoke()
                    throws Exception

Overrides:

afterInvoke in class StreamTask<T,SourceOperator<T,?>>

Throws:

Exception