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https://issues.apache.org/jira/browse/SPARK-16599?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15477378#comment-15477378
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Josh Rosen commented on SPARK-16599:
------------------------------------
I'm not quite sure why this asymmetry between {{readLocksByTask}} and
{{writeLocksByTask}} exists. However, the scenario that occurred here is
supposed to be impossible because the {[readLocksByTask}} entry should have
been created when {{BlockInfoManager.regsiterTask}} as called:
{code}
/**
* Called at the start of a task in order to register that task with this
[[BlockInfoManager]].
* This must be called prior to calling any other BlockInfoManager methods
from that task.
*/
def registerTask(taskAttemptId: TaskAttemptId): Unit = synchronized {
require(!readLocksByTask.contains(taskAttemptId),
s"Task attempt $taskAttemptId is already registered")
readLocksByTask(taskAttemptId) = ConcurrentHashMultiset.create()
}
{code}
My hunch is that there's some other bug here which is manifesting itself
through this error.
> java.util.NoSuchElementException: None.get at at
> org.apache.spark.storage.BlockInfoManager.releaseAllLocksForTask(BlockInfoManager.scala:343)
> ----------------------------------------------------------------------------------------------------------------------------------------------
>
> Key: SPARK-16599
> URL: https://issues.apache.org/jira/browse/SPARK-16599
> Project: Spark
> Issue Type: Bug
> Affects Versions: 2.0.0
> Environment: centos 6.7 spark 2.0
> Reporter: binde
>
> run a spark job with spark 2.0, error message
> Job aborted due to stage failure: Task 0 in stage 821.0 failed 4 times, most
> recent failure: Lost task 0.3 in stage 821.0 (TID 1480, e103):
> java.util.NoSuchElementException: None.get
> at scala.None$.get(Option.scala:347)
> at scala.None$.get(Option.scala:345)
> at
> org.apache.spark.storage.BlockInfoManager.releaseAllLocksForTask(BlockInfoManager.scala:343)
> at
> org.apache.spark.storage.BlockManager.releaseAllLocksForTask(BlockManager.scala:644)
> at org.apache.spark.executor.Executor$TaskRunner.run(Executor.scala:281)
> at
> java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
> at
> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
> at java.lang.Thread.run(Thread.java:745)
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