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

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()
void	terminationCompleted()
boolean	terminationRequested()

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

abortCheckpointOnBarrier, cancel, dispatchOperatorEvent, getCurrentNumberOfSubtasks, getEnvironment, getExecutionConfig, getIndexInSubtaskGroup, getJobConfiguration, getTaskConfiguration, getUserCodeClassLoader, isUsingNonBlockingInput, notifyCheckpointAbortAsync, notifyCheckpointCompleteAsync, restore, setShouldInterruptOnCancel, shouldInterruptOnCancel, 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 class: AbstractInvokable

Starts the execution.

Must be overwritten by the concrete task implementation. This method is called by the task manager when the actual execution of the task starts.

All resources should be cleaned up when the method returns. Make sure to guard the code with try-finally blocks where necessary.

Specified by:

invoke in class AbstractInvokable

Throws:

Exception - Tasks may forward their exceptions for the TaskManager to handle through failure/recovery.

terminationRequested

public boolean terminationRequested()

Specified by:

terminationRequested in interface Terminable

requestTermination

public void requestTermination()

Specified by:

requestTermination in interface Terminable

terminationCompleted

public void terminationCompleted()

Specified by:

terminationCompleted in interface Terminable