Package org.apache.flink.streaming.runtime.tasks

Class SourceOperatorStreamTask<T>

java.lang.Object

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

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

All Implemented Interfaces:

CheckpointableTask, CoordinatedTask, TaskInvokable, AsyncExceptionHandler, ContainingTaskDetails

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

A subclass of StreamTask for executing the SourceOperator.

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static class	SourceOperatorStreamTask.AsyncDataOutputToOutput<T>	Implementation of PushingAsyncDataInput.DataOutput that wraps a specific Output.

Nested classes/interfaces inherited from class org.apache.flink.streaming.runtime.tasks.StreamTask

StreamTask.CanEmitBatchOfRecordsChecker

Field Summary

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

checkpointStorage, configuration, inputProcessor, LOG, mailboxProcessor, mainOperator, operatorChain, recordWriter, stateBackend, systemTimerService, timerService, TRIGGER_THREAD_GROUP

Constructor Summary

Constructors

Constructor	Description
SourceOperatorStreamTask(Environment env)

Method Summary

Modifier and Type	Method	Description
protected void	advanceToEndOfEventTime()	Emits the MAX_WATERMARK so that all registered timers are fired.
protected void	declineCheckpoint(long checkpointId)
void	init()
Future<Void>	notifyCheckpointAbortAsync(long checkpointId, long latestCompletedCheckpointId)	Invoked when a checkpoint has been aborted, i.e., when the checkpoint coordinator has received a decline message from one task and try to abort the targeted checkpoint by notification.
Future<Void>	notifyCheckpointSubsumedAsync(long checkpointId)	Invoked when a checkpoint has been subsumed, i.e., when the checkpoint coordinator has confirmed one checkpoint has been finished, and try to remove the first previous checkpoint.
CompletableFuture<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, afterInvoke, cancel, cancelTask, cleanUp, cleanUpInternal, createRecordWriterDelegate, createStreamTaskStateInitializer, dispatchOperatorEvent, endData, finalize, getAsyncCheckpointStartDelayNanos, getAsyncOperationsThreadPool, getCancelables, getCanEmitBatchOfRecords, getCheckpointBarrierHandler, getCheckpointStorage, getCompletionFuture, getConfiguration, getEnvironment, getMailboxExecutorFactory, getName, getProcessingTimeServiceFactory, handleAsyncException, hasMail, invoke, isCanceled, isFailing, isMailboxLoopRunning, isRunning, isUsingNonBlockingInput, maybeInterruptOnCancel, notifyCheckpointCompleteAsync, notifyEndOfData, processInput, restore, runMailboxLoop, runMailboxStep, runSingleMailboxLoop, setSynchronousSavepoint, setupNumRecordsInCounter, toString, triggerCheckpointOnBarrier

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.apache.flink.streaming.runtime.tasks.ContainingTaskDetails

getExecutionConfig, getIndexInSubtaskGroup, getJobConfiguration, getUserCodeClassLoader

Constructor Details

SourceOperatorStreamTask

public SourceOperatorStreamTask(Environment env)
                         throws Exception

Throws:

Exception

Method Details

init

public void init()
          throws Exception

Specified by:

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

Throws:

Exception

triggerCheckpointAsync

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

Description copied from interface: CheckpointableTask

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 CheckpointableTask.triggerCheckpointOnBarrier(CheckpointMetaData, CheckpointOptions, CheckpointMetricsBuilder) method.

Specified by:

triggerCheckpointAsync in interface CheckpointableTask

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,?>>

declineCheckpoint

protected void declineCheckpoint(long checkpointId)

Overrides:

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

notifyCheckpointAbortAsync

public Future<Void> notifyCheckpointAbortAsync(long checkpointId,
 long latestCompletedCheckpointId)

Description copied from interface: CheckpointableTask

Invoked when a checkpoint has been aborted, i.e., when the checkpoint coordinator has received a decline message from one task and try to abort the targeted checkpoint by notification.

Specified by:

notifyCheckpointAbortAsync in interface CheckpointableTask

Overrides:

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

Parameters:

checkpointId - The ID of the checkpoint that is aborted.

latestCompletedCheckpointId - The ID of the latest completed checkpoint.

Returns:

future that completes when the notification has been processed by the task.

notifyCheckpointSubsumedAsync

public Future<Void> notifyCheckpointSubsumedAsync(long checkpointId)

Description copied from interface: CheckpointableTask

Invoked when a checkpoint has been subsumed, i.e., when the checkpoint coordinator has confirmed one checkpoint has been finished, and try to remove the first previous checkpoint.

Specified by:

notifyCheckpointSubsumedAsync in interface CheckpointableTask

Overrides:

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

Parameters:

checkpointId - The ID of the checkpoint that is subsumed.

Returns:

future that completes when the notification has been processed by the task.