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From "Luke Lu (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-8050) Deadlock in metrics
Date Sun, 12 Feb 2012 21:18:59 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-8050?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13206522#comment-13206522
] 

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

@Matt, I'd have already attached a patch if not for my employer's patch review/approval process.
For a quick fix for 1.0.1, the least risky approach would be commenting out the registerSystemSource
line in MetricsSystemImpl#configureSources. The metrics system metrics was mostly for the
original dev testing/debugging and not required for production. I'll review the patch :)


                
> 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: 1.1.0, 1.0.1
>
>         Attachments: 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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