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