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https://issues.apache.org/jira/browse/HADOOP-5516?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12682666#action_12682666
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Hemanth Yamijala commented on HADOOP-5516:
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Regarding changes in trunk, some minor nits:
- TaskMemoryManagerThread, there is an indentation problem in one of the
comments, which is becoming very misleading. Search for "updated state"
- Same method, the call to pTree.destroy(); was pTree.destroy(true); in trunk.
Though this is the default value for the overloaded API, I think it is better
to retain the original code in case it changes in future.
> TaskMemoryManagerThread crashes in a corner case
> ------------------------------------------------
>
> Key: HADOOP-5516
> URL: https://issues.apache.org/jira/browse/HADOOP-5516
> Project: Hadoop Core
> Issue Type: Bug
> Components: mapred
> Affects Versions: 0.20.0
> Reporter: Vinod K V
> Assignee: Vinod K V
> Priority: Blocker
> Fix For: 0.20.0
>
> Attachments: HADOOP-5516-1.txt, HADOOP-5516-trunk-1.txt
>
>
> TT's stdout says.
> {code}
> Exception in thread "org.apache.hadoop.mapred.TaskMemoryManagerThread"
> java.lang.NullPointerException
> at
> org.apache.hadoop.util.ProcfsBasedProcessTree.getProcessTree(ProcfsBasedProcessTree.java:126)
> at
> org.apache.hadoop.mapred.TaskMemoryManagerThread.run(TaskMemoryManagerThread.java:200)
> {code}
> TaskMemoryManager crashes and no further memory management is done.
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