Package org.apache.flink.runtime.iterative.task

Class IterationIntermediateTask<S extends org.apache.flink.api.common.functions.Function,OT>

java.lang.Object

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

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

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

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

All Implemented Interfaces:

Terminable, CheckpointableTask, CoordinatedTask, TaskInvokable, TaskContext<S,OT>

public class IterationIntermediateTask<S extends org.apache.flink.api.common.functions.Function,OT>
extends AbstractIterativeTask<S,OT>

An intermediate iteration task, which runs a Driver inside.

It will propagate EndOfSuperstepEvents and TerminationEvents to its connected tasks. Furthermore intermediate tasks can also update the iteration state, either the workset or the solution set.

If the iteration state is updated, the output of this task will be send back to the IterationHeadTask via a BlockingBackChannel for the workset -XOR- a HashTable for the solution set. In this case this task must be scheduled on the same instance as the head.

Field Summary

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

isSolutionSetUpdate, isWorksetIteration, isWorksetUpdate, worksetAggregator, worksetBackChannel

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

accumulatorMap, 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	Description
IterationIntermediateTask(Environment environment)	Create an Invokable task and set its environment.

Method Summary

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

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

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

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

cancelChainedTasks, clearReaders, clearWriters, closeChainedTasks, closeUserCode, constructLogString, createInputIterator, excludeFromReset, formatLogString, getContainingTask, getDriverComparator, getInput, getInputSerializer, getIOManager, getLastOutputCollector, getLastTasksConfig, getMemoryManager, getMetricGroup, getNumTaskInputs, getOutputCollector, getOutputCollector, getStub, getTaskConfig, getTaskManagerInfo, initBroadcastInputReaders, initBroadcastInputsSerializers, initInputReaders, initInputsSerializersAndComparators, initLocalStrategies, initOutputs, initOutputs, initStub, instantiateUserCode, invoke, logAndThrowException, openChainedTasks, openUserCode, readAndSetBroadcastInput, releaseBroadcastVariables, resetAllInputs, setLastOutputCollector

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

abortCheckpointOnBarrier, 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

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

getExecutionConfig, getUserCodeClassLoader

Constructor Details

IterationIntermediateTask

public IterationIntermediateTask(Environment environment)

Create an Invokable task and set its environment.

Parameters:

environment - The environment assigned to this invokable.

Method Details

initialize

protected void initialize()
                   throws Exception

Overrides:

initialize in class AbstractIterativeTask<S extends org.apache.flink.api.common.functions.Function,OT>

Throws:

Exception

run

public void run()
         throws Exception

Overrides:

run in class AbstractIterativeTask<S extends org.apache.flink.api.common.functions.Function,OT>

Throws:

Exception