Github user JoshRosen commented on a diff in the pull request:
https://github.com/apache/spark/pull/17955#discussion_r116124168
--- Diff: core/src/main/scala/org/apache/spark/scheduler/DAGScheduler.scala
---
@@ -1233,16 +1223,13 @@ class DAGScheduler(
logInfo("waiting: " + waitingStages)
logInfo("failed: " + failedStages)
- // We supply true to increment the epoch number here in case
this is a
+ // Increment the epoch number here in case this is a
// recomputation of the map outputs. In that case, some
nodes may have cached
// locations with holes (from when we detected the error)
and will need the
// epoch incremented to refetch them.
// TODO: Only increment the epoch number if this is not the
first time
--- End diff --
It might be possible to resolve this `TODO` but I haven't thought about it
too much yet.
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