X - The type of the bulk partial solution / solution set and the final output.Y - The type of the feed-back data set (bulk partial solution / workset). For bulk
iterations, Y is the same as Xpublic class IterationHeadTask<X,Y,S extends Function,OT> extends AbstractIterativeTask<S,OT>
Driver inside. It
will read the initial input and establish a BlockingBackChannel to the iteration's tail.
After successfully processing the input, it will send EndOfSuperstep events to its outputs. It
must also be connected to a synchronization task and after each superstep, it will wait until it
receives an AllWorkersDoneEvent from the sync, which signals that all other heads have
also finished their iteration. Starting with the second iteration, the input for the head is the
output of the tail, transmitted through the backchannel. Once the iteration is done, the head
will send a TerminationEvent to all it's connected tasks, signaling them to shutdown.
Assumption on the ordering of the outputs: - The first n output gates write to channels that go to the tasks of the step function. - The next m output gates to to the tasks that consume the final solution. - The last output gate connects to the synchronization task.
isSolutionSetUpdate, isWorksetIteration, isWorksetUpdate, worksetAggregator, worksetBackChannelaccumulatorMap, broadcastInputReaders, broadcastInputSerializers, chainedTasks, config, driver, eventualOutputs, inputComparators, inputIterators, inputReaders, inputs, inputSerializers, iterativeBroadcastInputs, iterativeInputs, localStrategies, LOG, output, resettableInputs, running, runtimeUdfContext, stub, tempBarriers| Constructor and Description |
|---|
IterationHeadTask(Environment environment)
Create an Invokable task and set its environment.
|
| Modifier and Type | Method and Description |
|---|---|
protected int |
getNumTaskInputs() |
protected void |
initOutputs()
Creates a writer for each output.
|
void |
run() |
brokerKey, cancel, closeLocalStrategiesAndCaches, createRuntimeContext, createSolutionSetUpdateOutputCollector, createWorksetUpdateOutputCollector, createWorksetUpdateOutputCollector, currentIteration, getIterationAggregators, incrementIterationCounter, inFirstIteration, initialize, requestTermination, terminationRequested, verifyEndOfSuperstepStatecancelChainedTasks, clearReaders, clearWriters, closeChainedTasks, closeUserCode, constructLogString, createInputIterator, excludeFromReset, formatLogString, getContainingTask, getDriverComparator, getInput, getInputSerializer, getIOManager, getLastOutputCollector, getLastTasksConfig, getMemoryManager, getMetricGroup, getOutputCollector, getOutputCollector, getStub, getTaskConfig, getTaskManagerInfo, initBroadcastInputReaders, initBroadcastInputsSerializers, initInputReaders, initInputsSerializersAndComparators, initLocalStrategies, initOutputs, initStub, instantiateUserCode, invoke, logAndThrowException, openChainedTasks, openUserCode, readAndSetBroadcastInput, releaseBroadcastVariables, resetAllInputs, setLastOutputCollectorabortCheckpointOnBarrier, dispatchOperatorEvent, executeInTaskThread, getCurrentNumberOfSubtasks, getEnvironment, getExecutionConfig, getIndexInSubtaskGroup, getJobConfiguration, getTaskConfiguration, getUserCodeClassLoader, notifyCheckpointAbortAsync, notifyCheckpointCompleteAsync, setShouldInterruptOnCancel, shouldInterruptOnCancel, triggerCheckpointAsync, triggerCheckpointOnBarrierclone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, waitgetExecutionConfig, getUserCodeClassLoaderpublic IterationHeadTask(Environment environment)
environment - The environment assigned to this invokable.protected int getNumTaskInputs()
getNumTaskInputs in class BatchTask<S extends Function,OT>protected void initOutputs()
throws Exception
BatchTaskCopyright © 2014–2021 The Apache Software Foundation. All rights reserved.