org.apache.flink.runtime.iterative.task

Class IterationTailPactTask<S extends Function,OT>

java.lang.Object

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

org.apache.flink.runtime.operators.RegularPactTask<S,OT>

org.apache.flink.runtime.iterative.task.AbstractIterativePactTask<S,OT>

org.apache.flink.runtime.iterative.task.IterationTailPactTask<S,OT>

All Implemented Interfaces:

Terminable, PactTaskContext<S,OT>

public class IterationTailPactTask<S extends Function,OT>
extends AbstractIterativePactTask<S,OT>

An iteration tail, which runs a driver inside.

If the iteration state is updated, the output of this task will be send back to the IterationHeadPactTask via a BackChannel for the workset -OR- a HashTable for the solution set. Therefore this task must be scheduled on the same instance as the head. It's also possible for the tail to update *both* the workset and the solution set.

If there is a separate solution set tail, the iteration head has to make sure to wait for it to finish.

Field Summary

Fields inherited from class org.apache.flink.runtime.iterative.task.AbstractIterativePactTask

isSolutionSetUpdate, isWorksetIteration, isWorksetUpdate, worksetAggregator, worksetBackChannel

Fields inherited from class org.apache.flink.runtime.operators.RegularPactTask

broadcastInputReaders, broadcastInputSerializers, chainedTasks, config, driver, eventualOutputs, inputComparators, inputIterators, inputReaders, inputs, inputSerializers, iterativeBroadcastInputs, iterativeInputs, localStrategies, LOG, output, resettableInputs, running, runtimeUdfContext, stub, tempBarriers

Constructor Summary

Constructors

Constructor and Description
IterationTailPactTask()

Method Summary

Methods

Modifier and Type	Method and Description
protected void	initialize()
void	run()

Methods inherited from class org.apache.flink.runtime.iterative.task.AbstractIterativePactTask

brokerKey, cancel, closeLocalStrategiesAndCaches, createRuntimeContext, createSolutionSetUpdateOutputCollector, createWorksetUpdateOutputCollector, createWorksetUpdateOutputCollector, currentIteration, getIterationAggregators, incrementIterationCounter, inFirstIteration, requestTermination, terminationRequested, verifyEndOfSuperstepState

Methods inherited from class org.apache.flink.runtime.operators.RegularPactTask

cancelChainedTasks, closeChainedTasks, closeUserCode, constructLogString, createInputIterator, excludeFromReset, formatLogString, getDriverComparator, getInput, getInputSerializer, getIOManager, getLastOutputCollector, getLastTasksConfig, getMemoryManager, getNumTaskInputs, getOutputCollector, getOutputCollector, getOwningNepheleTask, getStub, getTaskConfig, initBroadcastInputReaders, initBroadcastInputsSerializers, initInputReaders, initInputsSerializersAndComparators, initLocalStrategies, initOutputs, initOutputs, initOutputWriters, initStub, instantiateUserCode, invoke, logAndThrowException, openChainedTasks, openUserCode, readAndSetBroadcastInput, registerInputOutput, releaseBroadcastVariables, reportAndClearAccumulators, resetAllInputs, setLastOutputCollector

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

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

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.apache.flink.runtime.operators.PactTaskContext

getUserCodeClassLoader

Constructor Detail

IterationTailPactTask

public IterationTailPactTask()

Method Detail

initialize

protected void initialize()
                   throws Exception

Overrides:

initialize in class AbstractIterativePactTask<S extends Function,OT>

Throws:

Exception

run

public void run()
         throws Exception

Overrides:

run in class AbstractIterativePactTask<S extends Function,OT>

Throws:

Exception