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From "Todd Lipcon (JIRA)" <j...@apache.org>
Subject [jira] Commented: (MAPREDUCE-2080) Reducer JVM process hangs
Date Sun, 19 Sep 2010 21:48:33 GMT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-2080?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12912290#action_12912290
] 

Todd Lipcon commented on MAPREDUCE-2080:
----------------------------------------

Looks like an IPC hang during the running of shutdown hooks. I think in 0.21 the TT will send
a sigkill if the sigint doesn't work, so it won't be a big deal in the future, but the IPC
bug might still be around.

> Reducer JVM process hangs
> -------------------------
>
>                 Key: MAPREDUCE-2080
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-2080
>             Project: Hadoop Map/Reduce
>          Issue Type: Bug
>          Components: tasktracker
>    Affects Versions: 0.20.2
>            Reporter: Ted Yu
>         Attachments: Child-not-exiting.stack
>
>
> We use cdh3b2
> After reducer took more than 600 seconds to report to tasktracker, tasktracker tried
to kill it.
> However reducer JVM process hung.
> Attaching stack trace of reducer.

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