squito commented on a change in pull request #25620: [SPARK-25341][Core]
Support rolling back a shuffle map stage and re-generate the shuffle files
URL: https://github.com/apache/spark/pull/25620#discussion_r322456745
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File path: core/src/main/scala/org/apache/spark/scheduler/DAGScheduler.scala
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@@ -1531,9 +1540,9 @@ private[spark] class DAGScheduler(
// Mark all the map as broken in the map stage, to ensure retry
all the tasks on
// resubmitted stage attempt.
mapOutputTracker.unregisterAllMapOutput(shuffleId)
- } else if (mapId != -1) {
+ } else if (mapIndex != -1) {
// Mark the map whose fetch failed as broken in the map stage
- mapOutputTracker.unregisterMapOutput(shuffleId, mapId, bmAddress)
+ mapOutputTracker.unregisterMapOutput(shuffleId, mapIndex,
bmAddress)
}
Review comment:
the implicit `else` here is only if SHUFFLE_USE_OLD_FETCH_PROTOCOL, right?
worth at least a comment (otherwise that -1 will look more and more strange as
no one uses the old shuffle protocol anymore).
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