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https://issues.apache.org/jira/browse/HADOOP-4679?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12652891#action_12652891
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Hairong Kuang commented on HADOOP-4679:
---------------------------------------

ant test-core passed:
BUILD SUCCESSFUL
Total time: 118 minutes 28 seconds

and so did ant patch:
     [exec] +1 overall.

     [exec]     +1 @author.  The patch does not contain any @author tags.

     [exec]     +1 tests included.  The patch appears to include 4 new or 
modified tests.

     [exec]     +1 javadoc.  The javadoc tool did not generate any 
warningmessages.

     [exec]     +1 javac.  The applied patch does not increase the total number 
of javac compiler warnings.

     [exec]     +1 findbugs.  The patch does not introduce any new Findbugs 
warnings.

     [exec]     +1 Eclipse classpath. The patch retains Eclipse classpath 
integrity.


> Datanode prints tons of log messages: Waiting for threadgroup to exit, active 
> theads is XX
> ------------------------------------------------------------------------------------------
>
>                 Key: HADOOP-4679
>                 URL: https://issues.apache.org/jira/browse/HADOOP-4679
>             Project: Hadoop Core
>          Issue Type: Bug
>          Components: dfs
>            Reporter: Hairong Kuang
>            Assignee: Hairong Kuang
>         Attachments: diskError.patch, diskError1.patch, diskError2.patch, 
> diskError3.patch
>
>
> When a data receiver thread sees a disk error, it immediately calls shutdown 
> to shutdown DataNode. But the shutdown method does not return before all data 
> receiver threads exit, which will never happen. Therefore the DataNode gets 
> into a dead/live lock state, emitting tons of log messages: Waiting for 
> threadgroup to exit, active threads is XX.

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