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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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Amareshwari Sriramadasu updated MAPREDUCE-1397:
-----------------------------------------------
Attachment: patch-1397-2.txt
Patch makes the method JvmRunner.kill() synchronized so that if kill is
in-progress, the caller will wait till kill completes. Making the method
JvmRunner.kill() synchronized is fine because all the external callers are
already synchronized on JvmManager. Now patch makes it synchronized on
JvmRunner also.
> 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-1397-1.txt, patch-1397-2.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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