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From "Hudson (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-3718) Datanode won't shutdown because of runaway DataBlockScanner thread
Date Wed, 15 Aug 2012 13:20:39 GMT

    [ https://issues.apache.org/jira/browse/HDFS-3718?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13435075#comment-13435075
] 

Hudson commented on HDFS-3718:
------------------------------

Integrated in Hadoop-Mapreduce-trunk #1167 (See [https://builds.apache.org/job/Hadoop-Mapreduce-trunk/1167/])
    HDFS-3718. Datanode won't shutdown because of runaway DataBlockScanner thread (Kihwal
Lee via daryn) (Revision 1373090)

     Result = FAILURE
daryn : http://svn.apache.org/viewcvs.cgi/?root=Apache-SVN&view=rev&rev=1373090
Files : 
* /hadoop/common/trunk/hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt
* /hadoop/common/trunk/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/datanode/DataNode.java

                
> Datanode won't shutdown because of runaway DataBlockScanner thread
> ------------------------------------------------------------------
>
>                 Key: HDFS-3718
>                 URL: https://issues.apache.org/jira/browse/HDFS-3718
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: data-node
>    Affects Versions: 2.0.1-alpha
>            Reporter: Kihwal Lee
>            Assignee: Kihwal Lee
>            Priority: Critical
>             Fix For: 0.23.3, 2.1.0-alpha, 3.0.0, 2.2.0-alpha
>
>         Attachments: hdfs-3718.patch.txt
>
>
> Datanode sometimes does not shutdown because the block pool scanner thread keeps running.
It prints out "Starting a new period" every five seconds, even after {{shutdown()}} is called.
 Somehow the interrupt is missed.
> {{DataBlockScanner}} will also terminate if {{datanode.shouldRun}} is false, but in {{DataNode#shutdown}},
{{DataBlockScanner#shutdown()}} is invoked before it is being set to false.
> Is there any reason why {{datanode.shouldRun}} is set to false later? 

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