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https://issues.apache.org/jira/browse/SPARK-13631?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15179019#comment-15179019
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Apache Spark commented on SPARK-13631:
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User 'a1k0n' has created a pull request for this issue:
https://github.com/apache/spark/pull/11505
> getPreferredLocations race condition in spark 1.6.0?
> ----------------------------------------------------
>
> Key: SPARK-13631
> URL: https://issues.apache.org/jira/browse/SPARK-13631
> Project: Spark
> Issue Type: Bug
> Components: Scheduler
> Affects Versions: 1.6.0
> Reporter: Andy Sloane
>
> We are seeing something that looks a lot like a regression from spark 1.2.
> When we run jobs with multiple threads, we have a crash somewhere inside
> getPreferredLocations, as was fixed in SPARK-4454. Except now it's inside
> org.apache.spark.MapOutputTrackerMaster.getLocationsWithLargestOutputs
> instead of DAGScheduler directly.
> I tried Spark 1.2 post-SPARK-4454 (before this patch it's only slightly
> flaky), 1.4.1, and 1.5.2 and all are fine. 1.6.0 immediately crashes on our
> threaded test case, though once in a while it passes.
> The stack trace is huge, but starts like this:
> Caused by: java.lang.NullPointerException: null
> at
> org.apache.spark.MapOutputTrackerMaster.getLocationsWithLargestOutputs(MapOutputTracker.scala:406)
> at
> org.apache.spark.MapOutputTrackerMaster.getPreferredLocationsForShuffle(MapOutputTracker.scala:366)
> at
> org.apache.spark.rdd.ShuffledRDD.getPreferredLocations(ShuffledRDD.scala:92)
> at
> org.apache.spark.rdd.RDD$$anonfun$preferredLocations$2.apply(RDD.scala:257)
> at
> org.apache.spark.rdd.RDD$$anonfun$preferredLocations$2.apply(RDD.scala:257)
> at scala.Option.getOrElse(Option.scala:120)
> at org.apache.spark.rdd.RDD.preferredLocations(RDD.scala:256)
> at
> org.apache.spark.scheduler.DAGScheduler.org$apache$spark$scheduler$DAGScheduler$$getPreferredLocsInternal(DAGScheduler.scala:1545)
> The full trace is available here:
> https://gist.github.com/andy256/97611f19924bbf65cf49
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