Github user tgravescs commented on a diff in the pull request: https://github.com/apache/spark/pull/22288#discussion_r222810125 --- Diff: core/src/main/scala/org/apache/spark/scheduler/TaskSchedulerImpl.scala --- @@ -415,9 +421,63 @@ private[spark] class TaskSchedulerImpl( launchedAnyTask |= launchedTaskAtCurrentMaxLocality } while (launchedTaskAtCurrentMaxLocality) } + if (!launchedAnyTask) { - taskSet.abortIfCompletelyBlacklisted(hostToExecutors) - } + taskSet.getCompletelyBlacklistedTaskIfAny(hostToExecutors) match { + case taskIndex: Some[Int] => // Returns the taskIndex which was unschedulable + + // If the taskSet is unschedulable we try to find an existing idle blacklisted + // executor. If we cannot find one, we abort immediately. Else we kill the idle + // executor and kick off an abortTimer which after waiting will abort the taskSet if + // we were unable to schedule any task from the taskSet. + // Note 1: We keep a track of schedulability on a per taskSet basis rather than on a --- End diff -- we keep track
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