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From "Allen Wittenauer (JIRA)" <j...@apache.org>
Subject [jira] Updated: (MAPREDUCE-1869) TaskTracker hangs due to fork() being MT-unsafe
Date Wed, 16 Jun 2010 00:42:25 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 fork() being MT-unsafe  (was: TaskTracker hung in org.apache.hadoop.fs.LocalDirAllocator)

After talking with various folks, the current thinking is that this is related to http://bugs.sun.com/view_bug.do?bug_id=5049299
and friends.  My stack trace matches other traces where fork() has blown up.

> TaskTracker hangs due to 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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