Github user squito commented on a diff in the pull request:
https://github.com/apache/spark/pull/16620#discussion_r97586026
--- Diff: core/src/main/scala/org/apache/spark/scheduler/DAGScheduler.scala
---
@@ -1193,7 +1193,14 @@ class DAGScheduler(
}
if (runningStages.contains(shuffleStage) &&
shuffleStage.pendingPartitions.isEmpty) {
- markStageAsFinished(shuffleStage)
+ val noActiveTaskSetManager =
+ taskScheduler.rootPool == null ||
+ !taskScheduler.rootPool.getSortedTaskSetQueue.exists {
+ tsm => tsm.stageId == stageId && !tsm.isZombie
+ }
+ if (shuffleStage.isAvailable || noActiveTaskSetManager) {
+ markStageAsFinished(shuffleStage)
+ }
--- End diff --
I have to admit, though this passes all the tests, this is really confusing
to me. I only somewhat understand why your original version didn't work, and
why this should be used instead. Perhaps some more commenting here would help?
The condition under which you do `markStageAsFinished` seems very broad, so
perhaps its worth a comment on the case when you do *not* (and perhaps even a
`logInfo` in an `else` branch). The discrepancy between pendingPartitions and
availableOutputs is also surprising -- perhaps that is worth extra comments on
`Stage`, on how the meaning of those two are different.
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