Github user kayousterhout commented on a diff in the pull request:
https://github.com/apache/spark/pull/6652#discussion_r31765038
--- Diff: core/src/main/scala/org/apache/spark/scheduler/DAGScheduler.scala
---
@@ -1395,6 +1404,23 @@ class DAGScheduler(
return locs
}
}
+ case s: ShuffleDependency[_, _, _] =>
--- End diff --
Can you add a high-level comment here explaining what this is doing?
Something like "For reduce tasks, return the 5 locations with the largest map
outputs as preferred locations"
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