Github user kayousterhout commented on a diff in the pull request:
https://github.com/apache/spark/pull/8217#discussion_r38702574
--- Diff: core/src/main/scala/org/apache/spark/scheduler/DAGScheduler.scala
---
@@ -1052,39 +1041,22 @@ class DAGScheduler(
// we registered these map outputs.
mapOutputTracker.registerMapOutputs(
shuffleStage.shuffleDep.shuffleId,
- shuffleStage.outputLocs.map(list => if (list.isEmpty) null
else list.head),
+ shuffleStage.outputLocs.map(_.headOption.orNull),
changeEpoch = true)
clearCacheLocs()
+
+ // Some tasks had failed; let's resubmit this shuffleStage
--- End diff --
Why move this outside the if-statement? It looks like it only holds when
the if-statement is true, so less confusing I think to have it inside.
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