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From "Hairong Kuang (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-4679) Datanode prints tons of log messages: Waiting for threadgroup to exit, active theads is XX
Date Wed, 03 Dec 2008 18:49:44 GMT

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

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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