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From "Robert Joseph Evans (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-8050) Deadlock in metrics
Date Tue, 21 Feb 2012 17:22:36 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-8050?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13212747#comment-13212747

Robert Joseph Evans commented on HADOOP-8050:

I have seen a number of other builds fail with this, or with aborted lately. The failures
look like they started around Feb 10th, but I don't know for sure.  The first I saw of this,
when looking through JIRA is MAPREDUCE-3852.  But JQL cannot look for "RESULT = ABORTED" in
a comment.  It just pulls out everything that has result or = or ABORTED in it. 
> Deadlock in metrics
> -------------------
>                 Key: HADOOP-8050
>                 URL: https://issues.apache.org/jira/browse/HADOOP-8050
>             Project: Hadoop Common
>          Issue Type: Bug
>          Components: metrics
>    Affects Versions:,, 0.23.0, 1.0.0
>            Reporter: Kihwal Lee
>            Assignee: Kihwal Lee
>             Fix For: 1.0.1, 0.23.2
>         Attachments: hadoop-8050-branch-1.patch.txt, hadoop-8050-branch-1.patch.txt,
hadoop-8050-branch-1.patch.txt, hadoop-8050-branch-1.patch.txt, hadoop-8050-trunk.patch.txt,
hadoop-8050-trunk.patch.txt, hadoop-8050-trunk.patch.txt, hadoop-8050.patch.txt
> The metrics serving thread and the periodic snapshot thread can deadlock.
> It happened a few times on one of namenodes we have. When it happens RPC works but the
web ui and hftp stop working. I haven't look at the trunk too closely, but it might happen
there too.

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