Github user markhamstra commented on a diff in the pull request:
https://github.com/apache/spark/pull/686#discussion_r13106282
--- Diff: core/src/main/scala/org/apache/spark/scheduler/DAGScheduler.scala
---
@@ -1055,10 +1055,16 @@ class DAGScheduler(
// This is the only job that uses this stage, so fail the stage
if it is running.
val stage = stageIdToStage(stageId)
if (runningStages.contains(stage)) {
- taskScheduler.cancelTasks(stageId, shouldInterruptThread)
- val stageInfo = stageToInfos(stage)
- stageInfo.stageFailed(failureReason)
-
listenerBus.post(SparkListenerStageCompleted(stageToInfos(stage)))
+ try { // cancelTasks will fail if a SchedulerBackend does not
implement killTask
+ taskScheduler.cancelTasks(stageId, shouldInterruptThread)
+ } catch {
+ case e: UnsupportedOperationException =>
+ logInfo(s"Could not cancel tasks for stage $stageId", e)
+ } finally {
+ val stageInfo = stageToInfos(stage)
+ stageInfo.stageFailed(failureReason)
--- End diff --
Upon further review, I can't see any use (other than misleading the user)
for posting stage cancellation to the SparkListenerBus when the
SchedulerBackend does not support cancellation, so we won't do that.
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