Package org.apache.flink.runtime.webmonitor.stats

Class TaskStatsRequestCoordinator.PendingStatsRequest<T,V>

java.lang.Object
org.apache.flink.runtime.webmonitor.stats.TaskStatsRequestCoordinator.PendingStatsRequest<T,V>
Type Parameters:
T - Type of the result collected from tasks.
V - Type of the result assembled and returned when all tasks where sampled.
Enclosing class:
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.

  • Field Details

    • 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<Set<ExecutionAttemptID>> pendingTasks
      All tasks what did not yet return a result.

    • statsResultByTaskGroup

      protected final Map<org.apache.flink.shaded.guava32.com.google.common.collect.ImmutableSet<ExecutionAttemptID>,T> statsResultByTaskGroup
      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

  • Constructor Details

  • Method Details

    • isComplete

      protected boolean isComplete()

    • discard

      protected void discard(Throwable cause)

    • collectTaskStats

      protected void collectTaskStats(org.apache.flink.shaded.guava32.com.google.common.collect.ImmutableSet<ExecutionAttemptID> executionId, T taskStatsResult)
      Collects result from one of the tasks.
      Parameters:
      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.
      Returns:
      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.
      Parameters:
      endTime - The time when the final sample was collected.
      Returns:
      The final combined result, which will be returned as a future by the CompletableFuture<V> getStatsFuture method