Github user tdas commented on a diff in the pull request:
https://github.com/apache/spark/pull/6607#discussion_r31785028
--- Diff:
streaming/src/main/scala/org/apache/spark/streaming/scheduler/ReceiverTracker.scala
---
@@ -308,12 +305,41 @@ class ReceiverTracker(ssc: StreamingContext,
skipReceiverLaunch: Boolean = false
supervisor.start()
supervisor.awaitTermination()
}
+
// Run the dummy Spark job to ensure that all slaves have registered.
// This avoids all the receivers to be scheduled on the same node.
if (!ssc.sparkContext.isLocal) {
ssc.sparkContext.makeRDD(1 to 50, 50).map(x => (x,
1)).reduceByKey(_ + _, 20).collect()
}
+ // Right now, we only honor preferences if all receivers have them
+ val hasLocationPreferences =
receivers.map(_.preferredLocation.isDefined).reduce(_ && _)
--- End diff --
Would be nice if this new functionality is put into a function by itself.
So that we can unit test it individually to test against different combinations
of executors and all, may be different policies in the future.
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