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Date: Tue, 24 Jul 2012 18:31:34 +0000 (UTC)
From: "Suresh Srinivas (JIRA)" <jira@apache.org>
To: hdfs-issues@hadoop.apache.org
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Subject: [jira] [Commented] (HDFS-3718) Datanode won't shutdown because of
 runaway DataBlockScanner thread
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    [ https://issues.apache.org/jira/browse/HDFS-3718?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13421622#comment-13421622 ] 

Suresh Srinivas commented on HDFS-3718:
---------------------------------------

There is no specific reason for that order. We should set DataNode#shouldRun to false before other shutdown calls.
                
> 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
>            Priority: Critical
>             Fix For: 3.0.0, 2.2.0-alpha
>
>
> 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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