Github user JoshRosen commented on a diff in the pull request:
https://github.com/apache/spark/pull/17955#discussion_r116124372
--- Diff: core/src/main/scala/org/apache/spark/scheduler/DAGScheduler.scala
---
@@ -1216,7 +1205,8 @@ class DAGScheduler(
// The epoch of the task is acceptable (i.e., the task was
launched after the most
// recent failure we're aware of for the executor), so mark
the task's output as
// available.
- shuffleStage.addOutputLoc(smt.partitionId, status)
--- End diff --
In the old code we'd incrementally register map outputs in `ShuffleStage`
and then would write the entire set of complete map outputs into
`MapOutputTracker` in one shot upon stage completion (see line 1242 in the old
code). Now we write this incrementally.
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