Github user dhruve commented on a diff in the pull request:
https://github.com/apache/spark/pull/18950#discussion_r133547780
--- Diff:
core/src/main/scala/org/apache/spark/scheduler/TaskSetManager.scala ---
@@ -454,64 +477,68 @@ private[spark] class TaskSetManager(
}
}
- dequeueTask(execId, host, allowedLocality).map { case ((index,
taskLocality, speculative)) =>
- // Found a task; do some bookkeeping and return a task description
- val task = tasks(index)
- val taskId = sched.newTaskId()
- // Do various bookkeeping
- copiesRunning(index) += 1
- val attemptNum = taskAttempts(index).size
- val info = new TaskInfo(taskId, index, attemptNum, curTime,
- execId, host, taskLocality, speculative)
- taskInfos(taskId) = info
- taskAttempts(index) = info :: taskAttempts(index)
- // Update our locality level for delay scheduling
- // NO_PREF will not affect the variables related to delay
scheduling
- if (maxLocality != TaskLocality.NO_PREF) {
- currentLocalityIndex = getLocalityIndex(taskLocality)
- lastLaunchTime = curTime
- }
- // Serialize and return the task
- val serializedTask: ByteBuffer = try {
- ser.serialize(task)
- } catch {
- // If the task cannot be serialized, then there's no point to
re-attempt the task,
- // as it will always fail. So just abort the whole task-set.
- case NonFatal(e) =>
- val msg = s"Failed to serialize task $taskId, not attempting
to retry it."
- logError(msg, e)
- abort(s"$msg Exception during serialization: $e")
- throw new TaskNotSerializableException(e)
- }
- if (serializedTask.limit > TaskSetManager.TASK_SIZE_TO_WARN_KB *
1024 &&
- !emittedTaskSizeWarning) {
- emittedTaskSizeWarning = true
- logWarning(s"Stage ${task.stageId} contains a task of very large
size " +
- s"(${serializedTask.limit / 1024} KB). The maximum recommended
task size is " +
- s"${TaskSetManager.TASK_SIZE_TO_WARN_KB} KB.")
- }
- addRunningTask(taskId)
-
- // We used to log the time it takes to serialize the task, but
task size is already
- // a good proxy to task serialization time.
- // val timeTaken = clock.getTime() - startTime
- val taskName = s"task ${info.id} in stage ${taskSet.id}"
- logInfo(s"Starting $taskName (TID $taskId, $host, executor
${info.executorId}, " +
- s"partition ${task.partitionId}, $taskLocality,
${serializedTask.limit} bytes)")
-
- sched.dagScheduler.taskStarted(task, info)
- new TaskDescription(
- taskId,
- attemptNum,
- execId,
- taskName,
- index,
- addedFiles,
- addedJars,
- task.localProperties,
- serializedTask)
+ dequeueTask(execId, host, allowedLocality).map {
--- End diff --
yes. Will fix it.
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