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From "Allen Wittenauer (JIRA)" <j...@apache.org>
Subject [jira] Updated: (MAPREDUCE-1869) TaskTracker hangs due to Java's usage of fork() being MT-unsafe
Date Wed, 16 Jun 2010 00:42:27 GMT

     [ https://issues.apache.org/jira/browse/MAPREDUCE-1869?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Allen Wittenauer updated MAPREDUCE-1869:
----------------------------------------

    Summary: TaskTracker hangs due to Java's usage of fork() being MT-unsafe  (was: TaskTracker
hangs due to fork() being MT-unsafe)

> TaskTracker hangs due to Java's usage of fork() being MT-unsafe
> ---------------------------------------------------------------
>
>                 Key: MAPREDUCE-1869
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-1869
>             Project: Hadoop Map/Reduce
>          Issue Type: Bug
>          Components: tasktracker
>    Affects Versions: 0.20.2
>         Environment: Solaris 10 Update 7
> Java 1.6.0_14
>            Reporter: Allen Wittenauer
>            Priority: Critical
>         Attachments: jstack.txt, pstack.txt
>
>
> A TaskTracker process on our grid appears to be locked up and not sending heartbeats
to the namenode.  Attaching jstack and pstack output.  Even tho the hangs appear to be in
LocalDirAllocator, the local file system seems to be a-ok.  

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