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https://issues.apache.org/jira/browse/SPARK-5069?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14263795#comment-14263795
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Apache Spark commented on SPARK-5069:
-------------------------------------
User 'zsxwing' has created a pull request for this issue:
https://github.com/apache/spark/pull/3887
> Race condition in TaskSchedulerImpl.dagScheduler
> ------------------------------------------------
>
> Key: SPARK-5069
> URL: https://issues.apache.org/jira/browse/SPARK-5069
> Project: Spark
> Issue Type: Bug
> Components: Spark Core
> Reporter: Shixiong Zhu
> Priority: Minor
>
> `TaskSchedulerImpl.dagScheduler` is set in
> DAGSchedulerEventProcessActor.preStart. But Akka doesn't guarantee which
> thread `Actor.preStart` will run in. Usually it will run in a different
> thread, without proper protection, `TaskSchedulerImpl.dagScheduler` may be
> null when it's used. The following test failure demonstrates it.
> {noformat}
> [info] - Scheduler does not always schedule tasks on the same workers ***
> FAILED *** (37 milliseconds)
> [info] java.lang.NullPointerException:
> [info] at
> org.apache.spark.scheduler.TaskSchedulerImpl.executorAdded(TaskSchedulerImpl.scala:459)
> [info] at
> org.apache.spark.scheduler.TaskSchedulerImpl$$anonfun$resourceOffers$1.apply(TaskSchedulerImpl.scala:226)
> [info] at
> org.apache.spark.scheduler.TaskSchedulerImpl$$anonfun$resourceOffers$1.apply(TaskSchedulerImpl.scala:221)
> [info] at scala.collection.immutable.List.foreach(List.scala:318)
> [info] at
> org.apache.spark.scheduler.TaskSchedulerImpl.resourceOffers(TaskSchedulerImpl.scala:221)
> [info] at
> org.apache.spark.scheduler.TaskSchedulerImplSuite$$anonfun$4$$anonfun$6.apply(TaskSchedulerImplSuite.scala:287)
> [info] at
> org.apache.spark.scheduler.TaskSchedulerImplSuite$$anonfun$4$$anonfun$6.apply(TaskSchedulerImplSuite.scala:284)
> [info] at
> scala.collection.TraversableLike$$anonfun$map$1.apply(TraversableLike.scala:244)
> [info] at
> scala.collection.TraversableLike$$anonfun$map$1.apply(TraversableLike.scala:244)
> [info] at scala.collection.immutable.Range.foreach(Range.scala:141)
> [info] at
> scala.collection.TraversableLike$class.map(TraversableLike.scala:244)
> {noformat}
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