org.apache.flink.runtime.webmonitor.stats

类 TaskStatsRequestCoordinator.PendingStatsRequest<T,V>

java.lang.Object

org.apache.flink.runtime.webmonitor.stats.TaskStatsRequestCoordinator.PendingStatsRequest<T,V>

类型参数:

T - Type of the result collected from tasks.

V - Type of the result assembled and returned when all tasks where sampled.

封闭类:

TaskStatsRequestCoordinator<T,V>

@NotThreadSafe
protected abstract static class TaskStatsRequestCoordinator.PendingStatsRequest<T,V>
extends Object

A pending task stats request, which collects samples from individual tasks and completes the response future upon gathering all of of them.

Has to be accessed in lock scope.

字段概要

字段

限定符和类型	字段和说明
protected boolean	isDiscarded
protected Set<ExecutionAttemptID>	pendingTasks All tasks what did not yet return a result.
protected int	requestId ID of the sampling request to this coordinator.
protected CompletableFuture<V>	resultFuture The future with the final result.
protected long	startTime The time when the request is created.
protected Map<ExecutionAttemptID,T>	statsResultByTask Results returned by individual tasks and stored by the tasks' ExecutionAttemptID.

构造器概要

构造器

限定符	构造器和说明
protected	PendingStatsRequest(int requestId, Collection<ExecutionAttemptID> tasksToCollect) Creates new TaskStatsRequestCoordinator.PendingStatsRequest.

方法概要

限定符和类型	方法和说明
protected abstract V	assembleCompleteStats(long endTime) A method that is called when responses from all tasks were collected successfully.
protected void	checkDiscarded()
protected void	collectTaskStats(ExecutionAttemptID executionId, T taskStatsResult) Collects result from one of the tasks.
protected void	completePromiseAndDiscard()
protected void	discard(Throwable cause)
CompletableFuture<V>	getStatsFuture() A Future, which will either complete successfully if all of the samples from individual tasks are collected or exceptionally, if at least one of the task responses fails.
protected boolean	isComplete()

从类继承的方法 java.lang.Object

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

字段详细资料

requestId

protected final int requestId

ID of the sampling request to this coordinator.

startTime

protected final long startTime

The time when the request is created.

pendingTasks

protected final Set<ExecutionAttemptID> pendingTasks

All tasks what did not yet return a result.

statsResultByTask

protected final Map<ExecutionAttemptID,T> statsResultByTask

Results returned by individual tasks and stored by the tasks' ExecutionAttemptID.

resultFuture

protected final CompletableFuture<V> resultFuture

The future with the final result.

isDiscarded

protected boolean isDiscarded

构造器详细资料

PendingStatsRequest

protected PendingStatsRequest(int requestId,
                              Collection<ExecutionAttemptID> tasksToCollect)

Creates new TaskStatsRequestCoordinator.PendingStatsRequest.

参数:

requestId - ID of the request.

tasksToCollect - tasks from which the stats responses are expected.

方法详细资料

isComplete

protected boolean isComplete()

discard

protected void discard(Throwable cause)

collectTaskStats

protected void collectTaskStats(ExecutionAttemptID executionId,
                                T taskStatsResult)

Collects result from one of the tasks.

参数:

executionId - ID of the Task.

taskStatsResult - Result of the stats sample from the Task.

checkDiscarded

protected void checkDiscarded()

completePromiseAndDiscard

protected void completePromiseAndDiscard()

getStatsFuture

public CompletableFuture<V> getStatsFuture()

A Future, which will either complete successfully if all of the samples from individual tasks are collected or exceptionally, if at least one of the task responses fails.

返回:

A future with the result of collecting tasks statistics.

assembleCompleteStats

protected abstract V assembleCompleteStats(long endTime)

A method that is called when responses from all tasks were collected successfully. It is responsible for assembling the final result from the individual tasks' samples. Those samples can be accessed via the Map<ExecutionAttemptID, T> statsResultByTask variable.

参数:

endTime - The time when the final sample was collected.

返回:

The final combined result, which will be returned as a future by the CompletableFuture<V> getStatsFuture method