jerrypeng commented on code in PR #57286:
URL: https://github.com/apache/spark/pull/57286#discussion_r3600432576
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core/src/main/scala/org/apache/spark/SparkEnv.scala:
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@@ -323,28 +449,45 @@ class SparkEnv (
return
}
+ // The tracker is needed when the pipelined manager
(spark.shuffle.manager.incremental) is a
+ // StreamingShuffleManager -- which is the default -- to serve pipelined
shuffle dependencies.
+ // Inspect the already-instantiated manager rather than re-reading the
config, so an empty
+ // (disabled) incremental slot is correctly treated as "no tracker".
+ val incrementalIsStreaming =
+ _pipelinedShuffleManager.exists(_.isInstanceOf[StreamingShuffleManager])
+ if (incrementalIsStreaming) {
+ createStreamingShuffleOutputTracker()
+ return
+ }
+
+ // It is also needed when a MultiShuffleManager is the blocking manager
(spark.shuffle.manager):
+ // it internally routes some shuffles to streaming. A bare
StreamingShuffleManager cannot be the
+ // blocking manager -- it is pipelined and rejected from that slot in
initializeShuffleManager.
Review Comment:
Add a todo to eventually remove this when we can remove MultiShuffleManager
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