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https://issues.apache.org/jira/browse/MAPREDUCE-1397?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Vinod K V updated MAPREDUCE-1397:
---------------------------------
Release Note: Fixed a race condition involving JvmRunner.kill() and
KillTaskAction, which was leading to an NullPointerException causing a
transient inconsistent state in JvmManager and failure of tasks. (was: Fixed a
NullPointerException observed in JvmManager during task failures that resulted
in a transient inconsistent state.)
> NullPointerException observed during task failures
> --------------------------------------------------
>
> Key: MAPREDUCE-1397
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-1397
> Project: Hadoop Map/Reduce
> Issue Type: Bug
> Components: tasktracker
> Affects Versions: 0.20.1
> Reporter: Ramya R
> Assignee: Amareshwari Sriramadasu
> Priority: Minor
> Fix For: 0.21.0
>
> Attachments: patch-1397-1.txt, patch-1397-2.txt, patch-1397-3.txt,
> patch-1397-ydist.txt, patch-1397.txt
>
>
> In an environment where many jobs are killed simultaneously, NPEs are
> observed in the TT/JT logs when a task fails. The situation is aggravated
> when the taskcontroller.cfg is not configured properly. Below is the
> exception obtained:
> {noformat}
> INFO org.apache.hadoop.mapred.TaskInProgress: Error from <attempt_ID>:
> java.lang.Throwable: Child Error
> at org.apache.hadoop.mapred.TaskRunner.run(TaskRunner.java:529)
> Caused by: java.lang.NullPointerException
> at
> org.apache.hadoop.mapred.JvmManager$JvmManagerForType.getDetails(JvmManager.java:329)
> at
> org.apache.hadoop.mapred.JvmManager$JvmManagerForType.reapJvm(JvmManager.java:315)
> at
> org.apache.hadoop.mapred.JvmManager$JvmManagerForType.access$000(JvmManager.java:146)
> at org.apache.hadoop.mapred.JvmManager.launchJvm(JvmManager.java:109)
> at org.apache.hadoop.mapred.TaskRunner.run(TaskRunner.java:502)
> {noformat}
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