Github user kayousterhout commented on a diff in the pull request:
https://github.com/apache/spark/pull/15249#discussion_r81400344
--- Diff:
core/src/main/scala/org/apache/spark/scheduler/TaskSetManager.scala ---
@@ -592,34 +589,54 @@ private[spark] class TaskSetManager(
* failures (this is because the method picks on unscheduled task, and
then iterates through each
* executor until it finds one that the task hasn't failed on already).
*/
- private[scheduler] def abortIfCompletelyBlacklisted(executors:
Iterable[String]): Unit = {
-
- val pendingTask: Option[Int] = {
- // usually this will just take the last pending task, but because of
the lazy removal
- // from each list, we may need to go deeper in the list. We poll
from the end because
- // failed tasks are put back at the end of allPendingTasks, so we're
more likely to find
- // an unschedulable task this way.
- val indexOffset = allPendingTasks.lastIndexWhere { indexInTaskSet =>
- copiesRunning(indexInTaskSet) == 0 && !successful(indexInTaskSet)
- }
- if (indexOffset == -1) {
- None
- } else {
- Some(allPendingTasks(indexOffset))
- }
- }
+ private[scheduler] def abortIfCompletelyBlacklisted(
+ hostToExecutors: HashMap[String, HashSet[String]]): Unit = {
+ taskSetBlacklistOpt.foreach { taskSetBlacklist =>
+ // If no executors have registered yet, don't abort the stage,
just wait. We probably
+ // got here because a task set was added before the executors
registered.
+ if (hostToExecutors.nonEmpty) {
+ // take any task that needs to be scheduled, and see if we can
find some executor it *could*
+ // run on
+ val pendingTask: Option[Int] = {
+ // usually this will just take the last pending task, but
because of the lazy removal
+ // from each list, we may need to go deeper in the list. We
poll from the end because
+ // failed tasks are put back at the end of allPendingTasks, so
we're more likely to find
+ // an unschedulable task this way.
+ val indexOffset = allPendingTasks.lastIndexWhere {
indexInTaskSet =>
+ copiesRunning(indexInTaskSet) == 0 &&
!successful(indexInTaskSet)
+ }
+ if (indexOffset == -1) {
+ None
+ } else {
+ Some(allPendingTasks(indexOffset))
+ }
+ }
- // If no executors have registered yet, don't abort the stage, just
wait. We probably
- // got here because a task set was added before the executors
registered.
- if (executors.nonEmpty) {
- // take any task that needs to be scheduled, and see if we can find
some executor it *could*
- // run on
- pendingTask.foreach { taskId =>
- if (executors.forall(executorIsBlacklisted(_, taskId))) {
- val execs = executors.toIndexedSeq.sorted.mkString("(", ",", ")")
- val partition = tasks(taskId).partitionId
- abort(s"Aborting ${taskSet} because task $taskId (partition
$partition)" +
- s" has already failed on executors $execs, and no other
executors are available.")
+ pendingTask.foreach { indexInTaskSet =>
+ // try to find some executor this task can run on. Its possible
that some *other*
+ // task isn't schedulable anywhere, but we will discover that in
some later call,
+ // when that unschedulable task is the last task remaining.
+ val blacklistedEverywhere = hostToExecutors.forall { case (host,
execs) =>
--- End diff --
execsOnHost? (o/w confusing on line 628)
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