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