org.apache.flink.streaming.runtime.tasks

类 StreamIterationHead<OUT>

java.lang.Object

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

org.apache.flink.streaming.runtime.tasks.StreamTask<OUT,OneInputStreamOperator<IN,OUT>>

org.apache.flink.streaming.runtime.tasks.OneInputStreamTask<OUT,OUT>

org.apache.flink.streaming.runtime.tasks.StreamIterationHead<OUT>

所有已实现的接口:

AsyncExceptionHandler

@Internal
public class StreamIterationHead<OUT>
extends OneInputStreamTask<OUT,OUT>

A special StreamTask that is used for executing feedback edges. This is used in combination with StreamIterationTail.

字段概要

从类继承的字段 org.apache.flink.streaming.runtime.tasks.StreamTask

configuration, headOperator, inputProcessor, mailboxProcessor, operatorChain, stateBackend, timerService, TRIGGER_THREAD_GROUP

构造器概要

构造器

构造器和说明
StreamIterationHead(org.apache.flink.runtime.execution.Environment env)

方法概要

限定符和类型	方法和说明
protected void	cleanup()
static String	createBrokerIdString(org.apache.flink.api.common.JobID jid, String iterationID, int subtaskIndex) Creates the identification string with which head and tail task find the shared blocking queue for the back channel.
void	init()
protected void	processInput(MailboxDefaultAction.Controller controller) This method implements the default action of the task (e.g. processing one event from the input).

从类继承的方法 org.apache.flink.streaming.runtime.tasks.StreamTask

abortCheckpointOnBarrier, advanceToEndOfEventTime, afterInvoke, beforeInvoke, cancel, cancelTask, cleanUpInvoke, createRecordWriterDelegate, createStreamTaskStateInitializer, declineCheckpoint, dispatchOperatorEvent, executeInTaskThread, finalize, finishTask, getAsyncCheckpointStartDelayNanos, getAsyncOperationsThreadPool, getCancelables, getCheckpointStorage, getCompletionFuture, getConfiguration, getMailboxExecutorFactory, getName, getProcessingTimeServiceFactory, getStreamStatusMaintainer, handleAsyncException, invoke, isCanceled, isFailing, isMailboxLoopRunning, isRunning, notifyCheckpointAbortAsync, notifyCheckpointCompleteAsync, runMailboxStep, setupNumRecordsInCounter, toString, triggerCheckpointAsync, triggerCheckpointOnBarrier

从类继承的方法 org.apache.flink.runtime.jobgraph.tasks.AbstractInvokable

getCurrentNumberOfSubtasks, getEnvironment, getExecutionConfig, getIndexInSubtaskGroup, getJobConfiguration, getTaskConfiguration, getUserCodeClassLoader, setShouldInterruptOnCancel, shouldInterruptOnCancel

从类继承的方法 java.lang.Object

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

构造器详细资料

StreamIterationHead

public StreamIterationHead(org.apache.flink.runtime.execution.Environment env)
                    throws Exception

抛出:

Exception

方法详细资料

processInput

protected void processInput(MailboxDefaultAction.Controller controller)
                     throws Exception

从类复制的说明: StreamTask

This method implements the default action of the task (e.g. processing one event from the input). Implementations should (in general) be non-blocking.

覆盖:

processInput 在类中 StreamTask<OUT,OneInputStreamOperator<OUT,OUT>>

参数:

controller - controller object for collaborative interaction between the action and the stream task.

抛出:

Exception - on any problems in the action.

init

public void init()

覆盖:

init 在类中 OneInputStreamTask<OUT,OUT>

cleanup

protected void cleanup()

覆盖:

cleanup 在类中 StreamTask<OUT,OneInputStreamOperator<OUT,OUT>>

createBrokerIdString

public static String createBrokerIdString(org.apache.flink.api.common.JobID jid,
                                          String iterationID,
                                          int subtaskIndex)

Creates the identification string with which head and tail task find the shared blocking queue for the back channel. The identification string is unique per parallel head/tail pair per iteration per job.

参数:

jid - The job ID.

iterationID - The id of the iteration in the job.

subtaskIndex - The parallel subtask number

返回:

The identification string.