Github user JoshRosen commented on a diff in the pull request:
https://github.com/apache/spark/pull/4066#discussion_r24461950
--- Diff: core/src/main/scala/org/apache/spark/SparkEnv.scala ---
@@ -350,6 +356,13 @@ object SparkEnv extends Logging {
"levels using the RDD.persist() method instead.")
}
+ val outputCommitCoordinator = mockOutputCommitCoordinator.getOrElse {
+ new OutputCommitCoordinator(conf)
+ }
--- End diff --
Ah, I see how this could be confusing: the OutputCommitCoordinator class
serves as both a server and a client interface, similar to
MapOutputStatusTracker and a couple of other classes. I'll see about splitting
the client functionality into a separate `OutputCommitCoordinatorClient` class
that's initialized everywhere and leave the OutputCommitCoordinator as a
driver-only component.
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