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https://issues.apache.org/jira/browse/SPARK-5071?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
 ]

Shixiong Zhu closed SPARK-5071.
-------------------------------
    Resolution: Duplicate

Sorry that creating the dulicate issue due to bad network.

> Race condition in TaskSchedulerImpl.dagScheduler
> ------------------------------------------------
>
>                 Key: SPARK-5071
>                 URL: https://issues.apache.org/jira/browse/SPARK-5071
>             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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