Shixiong Zhu created SPARK-5072:
-----------------------------------
Summary: Race condition in TaskSchedulerImpl.dagScheduler
Key: SPARK-5072
URL: https://issues.apache.org/jira/browse/SPARK-5072
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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