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From "Amareshwari Sriramadasu (JIRA)" <j...@apache.org>
Subject [jira] Updated: (MAPREDUCE-1397) NullPointerException observed during task failures
Date Tue, 09 Mar 2010 04:43:27 GMT

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

Amareshwari Sriramadasu updated MAPREDUCE-1397:
-----------------------------------------------

    Status: Open  (was: Patch Available)

> 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: 0.22.0
>
>         Attachments: 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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