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From "Luke Lu (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-8050) Deadlock in metrics
Date Mon, 13 Feb 2012 21:40:59 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-8050?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13207239#comment-13207239
] 

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

static analysis is hopeless for this case, as the compiler needs to know all the possible
dynamic bindings of metrics source before hand. I recall that Todd ran jcarder (dynamic deadlock
finder) on metrics2 in trunk and didn't find the issue, probably due to a lack of test coverage
in the jmx metrics serving (there are some tests but we need to make sure snapshot thread
happens in the tests as well), or the fact that metrics sources can be created via annotations.
                
> 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-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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