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From "Vinod K V (JIRA)" <j...@apache.org>
Subject [jira] Updated: (MAPREDUCE-1397) NullPointerException observed during task failures
Date Wed, 19 May 2010 14:24:54 GMT

     [ https://issues.apache.org/jira/browse/MAPREDUCE-1397?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel

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,
> 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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