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()

Method Summary

Modifier and Type	Method and Description
void	invoke() Must be overwritten by the concrete task.
void	registerInputOutput() Must be overwritten by the concrete task to instantiate the required record reader and record writer.
void	requestTermination()
boolean	terminationRequested()

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

cancel, getCurrentNumberOfSubtasks, getEnvironment, getExecutionConfig, getIndexInSubtaskGroup, getJobConfiguration, getTaskConfiguration, getUserCodeClassLoader, setEnvironment

Methods inherited from class java.lang.Object

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

Constructor Detail

IterationSynchronizationSinkTask

public IterationSynchronizationSinkTask()

Method Detail

registerInputOutput

public void registerInputOutput()

Description copied from class: AbstractInvokable

Must be overwritten by the concrete task to instantiate the required record reader and record writer.

Specified by:

registerInputOutput in class AbstractInvokable

invoke

public void invoke()
            throws Exception

Description copied from class: AbstractInvokable

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

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