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https://issues.apache.org/jira/browse/HADOOP-8050?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13211813#comment-13211813
 ] 

Hudson commented on HADOOP-8050:
--------------------------------

Integrated in Hadoop-Hdfs-trunk #961 (See 
[https://builds.apache.org/job/Hadoop-Hdfs-trunk/961/])
    HADOOP-8050. Deadlock in metrics. Contributed by Kihwal Lee. (Revision 
1291084)

     Result = SUCCESS
mattf : http://svn.apache.org/viewcvs.cgi/?root=Apache-SVN&view=rev&rev=1291084
Files : 
* /hadoop/common/trunk/hadoop-common-project/hadoop-common/CHANGES.txt
* 
/hadoop/common/trunk/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/metrics2/impl/MetricsSourceAdapter.java

                
> 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: 1.0.1, 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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