Github user javadba commented on the pull request:

    https://github.com/apache/spark/pull/1586#issuecomment-50951491
  
    BTW I am seeing testing errors in core for MapOutputTracker involving OOME. 
I had to restart testing a few times already. This is not anything to do with 
the code of this PR, just trying to do overall regrssion testing but failing in 
unrelated tests.  Oh. it just failed again:
    
    
    
        ClosureCleanerSuite:
        - closures inside an object *** FAILED ***
          org.apache.spark.SparkException: Error communicating with 
MapOutputTracker
          at 
org.apache.spark.MapOutputTracker.askTracker(MapOutputTracker.scala:111)
          at 
org.apache.spark.MapOutputTracker.sendTracker(MapOutputTracker.scala:117)
          at 
org.apache.spark.MapOutputTrackerMaster.stop(MapOutputTracker.scala:324)
          at org.apache.spark.SparkEnv.stop(SparkEnv.scala:83)
          at org.apache.spark.SparkContext.stop(SparkContext.scala:1003)
          at 
org.apache.spark.LocalSparkContext$.stop(LocalSparkContext.scala:50)
          at 
org.apache.spark.LocalSparkContext$.withSpark(LocalSparkContext.scala:61)
          at org.apache.spark.util.TestObject$.run(ClosureCleanerSuite.scala:76)
          at 
org.apache.spark.util.ClosureCleanerSuite$$anonfun$1.apply$mcV$sp(ClosureCleanerSuite.scala:27)
          at 
org.apache.spark.util.ClosureCleanerSuite$$anonfun$1.apply(ClosureCleanerSuite.scala:27)
          ...
          Cause: akka.pattern.AskTimeoutException: 
Recipient[Actor[akka://spark/user/MapOutputTracker#221210107]] had already been 
terminated.
          at akka.pattern.AskableActorRef$.ask$extension(AskSupport.scala:134)
          at 
org.apache.spark.MapOutputTracker.askTracker(MapOutputTracker.scala:106)
          at 
org.apache.spark.MapOutputTracker.sendTracker(MapOutputTracker.scala:117)
          at 
org.apache.spark.MapOutputTrackerMaster.stop(MapOutputTracker.scala:324)
          at org.apache.spark.SparkEnv.stop(SparkEnv.scala:83)
          at org.apache.spark.SparkContext.stop(SparkContext.scala:1003)
          at 
org.apache.spark.LocalSparkContext$.stop(LocalSparkContext.scala:50)
          at 
org.apache.spark.LocalSparkContext$.withSpark(LocalSparkContext.scala:61)
          at org.apache.spark.util.TestObject$.run(ClosureCleanerSuite.scala:76)
          at 
org.apache.spark.util.ClosureCleanerSuite$$anonfun$1.apply$mcV$sp(ClosureCleanerSuite.scala:27)
          ...
        *** RUN ABORTED ***
          java.lang.OutOfMemoryError: unable to create new native thread
          at java.lang.Thread.start0(Native Method)
          at java.lang.Thread.start(Thread.java:679)
          at 
org.eclipse.jetty.util.thread.QueuedThreadPool.startThread(QueuedThreadPool.java:441)
          at 
org.eclipse.jetty.util.thread.QueuedThreadPool.doStart(QueuedThreadPool.java:108)
          at 
org.eclipse.jetty.util.component.AbstractLifeCycle.start(AbstractLifeCycle.java:64)
          at 
org.eclipse.jetty.util.component.AggregateLifeCycle.doStart(AggregateLifeCycle.java:81)
          at 
org.eclipse.jetty.server.handler.AbstractHandler.doStart(AbstractHandler.java:58)
          at 
org.eclipse.jetty.server.handler.HandlerWrapper.doStart(HandlerWrapper.java:96)
          at org.eclipse.jetty.server.Server.doStart(Server.java:282)
          at 
org.eclipse.jetty.util.component.AbstractLifeCycle.start(AbstractLifeCycle.java:64)
          ...



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