org.apache.flink.runtime.iterative.task

Class IterationSynchronizationSinkTask

java.lang.Object

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

org.apache.flink.runtime.iterative.task.IterationSynchronizationSinkTask

All Implemented Interfaces:

Terminable, CheckpointableTask, CoordinatedTask, TaskInvokable

public class IterationSynchronizationSinkTask
extends AbstractInvokable
implements Terminable

The task responsible for synchronizing all iteration heads, implemented as an output task. This task will never see any data. In each superstep, it simply waits until it has received a WorkerDoneEvent from each head and will send back an AllWorkersDoneEvent to signal that the next superstep can begin.

Constructor Summary

Constructors

Constructor and Description
IterationSynchronizationSinkTask(Environment environment) Create an Invokable task and set its environment.

Method Summary

Modifier and Type	Method and Description
void	invoke() Starts the execution.
void	requestTermination()
boolean	terminationRequested()

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

abortCheckpointOnBarrier, cancel, cleanUp, dispatchOperatorEvent, getCurrentNumberOfSubtasks, getEnvironment, getExecutionConfig, getIndexInSubtaskGroup, getJobConfiguration, getTaskConfiguration, getUserCodeClassLoader, isUsingNonBlockingInput, maybeInterruptOnCancel, notifyCheckpointAbortAsync, notifyCheckpointCompleteAsync, notifyCheckpointSubsumedAsync, restore, triggerCheckpointAsync, triggerCheckpointOnBarrier

Methods inherited from class java.lang.Object

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

Constructor Detail

IterationSynchronizationSinkTask

public IterationSynchronizationSinkTask(Environment environment)

Create an Invokable task and set its environment.

Parameters:

environment - The environment assigned to this invokable.

Method Detail

invoke

public void invoke()
            throws Exception

Description copied from interface: TaskInvokable

Starts the execution.

This method is called by the task manager when the actual execution of the task starts.

All resources should be cleaned up by calling TaskInvokable.cleanUp(Throwable) after the method returns.

Specified by:

invoke in interface TaskInvokable

Specified by:

invoke in class AbstractInvokable

Throws:

Exception

terminationRequested

public boolean terminationRequested()

Specified by:

terminationRequested in interface Terminable

requestTermination

public void requestTermination()

Specified by:

requestTermination in interface Terminable