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https://issues.apache.org/jira/browse/SPARK-19883?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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hustfxj reopened SPARK-19883:
-----------------------------

I this it is a question, like that 
https://issues.apache.org/jira/browse/SPARK-19300

> Executor is waiting for lock
> ----------------------------
>
>                 Key: SPARK-19883
>                 URL: https://issues.apache.org/jira/browse/SPARK-19883
>             Project: Spark
>          Issue Type: Bug
>          Components: Spark Core
>    Affects Versions: 2.1.0
>            Reporter: hustfxj
>         Attachments: jstack
>
>
> {code:borderStyle=solid}
> "Executor task launch worker for task 4808985" #5373 daemon prio=5 os_prio=0 
> tid=0x00007f54ef437000 nid=0x1aed0 waiting on condition [0x00007f53aebfe000]
>    java.lang.Thread.State: WAITING (parking)
>         at sun.misc.Unsafe.park(Native Method)
>         - parking to wait for  <0x0000000498c249c0> (a 
> java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject)
>         at java.util.concurrent.locks.LockSupport.park(LockSupport.java:189)
>         at 
> java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(AbstractQueuedSynchronizer.java:2039)
>         at 
> java.util.concurrent.LinkedBlockingQueue.take(LinkedBlockingQueue.java:442)
>         at 
> org.apache.spark.storage.ShuffleBlockFetcherIterator.next(ShuffleBlockFetcherIterator.scala:332)
>         at 
> org.apache.spark.storage.ShuffleBlockFetcherIterator.next(ShuffleBlockFetcherIterator.scala:58)
>         at scala.collection.Iterator$$anon$12.nextCur(Iterator.scala:434)
>         at scala.collection.Iterator$$anon$12.hasNext(Iterator.scala:440)
>         at scala.collection.Iterator$$anon$11.hasNext(Iterator.scala:408)
>         at 
> org.apache.spark.util.CompletionIterator.hasNext(CompletionIterator.scala:32)
>         at 
> org.apache.spark.InterruptibleIterator.hasNext(InterruptibleIterator.scala:39)
>         at scala.collection.Iterator$$anon$11.hasNext(Iterator.scala:408)
>         at scala.collection.Iterator$$anon$11.hasNext(Iterator.scala:408)
>         at scala.collection.Iterator$$anon$11.hasNext(Iterator.scala:408)
>         at scala.collection.Iterator$$anon$11.hasNext(Iterator.scala:408)
>         at scala.collection.Iterator$$anon$11.hasNext(Iterator.scala:408)
>         at 
> org.apache.spark.util.collection.ExternalSorter.insertAll(ExternalSorter.scala:199)
>         at 
> org.apache.spark.shuffle.sort.SortShuffleWriter.write(SortShuffleWriter.scala:63)
>         at 
> org.apache.spark.scheduler.ShuffleMapTask.runTask(ShuffleMapTask.scala:97)
>         at 
> org.apache.spark.scheduler.ShuffleMapTask.runTask(ShuffleMapTask.scala:54)
>         at org.apache.spark.scheduler.Task.run(Task.scala:114)
>         at 
> org.apache.spark.executor.Executor$TaskRunner.run(Executor.scala:323)
>         at 
> java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1147)
>         at 
> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:622)
>         at java.lang.Thread.run(Thread.java:834)



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