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From "Luke Lu (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-8050) Deadlock in metrics
Date Tue, 14 Feb 2012 22:26:00 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-8050?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13208085#comment-13208085
] 

Luke Lu commented on HADOOP-8050:
---------------------------------

The latest patch lgtm, +1. Thanks Kihwal. It'll be great if you can add a test case for the
jmx metrics serving (the purpose is not reproduce the deadlock, but people can run something
like jcarder with the unit tests and detect potential deadlocks). I'm not holding my +1 for
it though.
                
> 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: 0.20.204.0, 0.20.205.0, 0.23.0, 1.0.0
>            Reporter: Kihwal Lee
>            Assignee: Kihwal Lee
>             Fix For: 0.24.0, 1.1.0, 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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