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From "Suresh Srinivas (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-3718) Datanode won't shutdown because of runaway DataBlockScanner thread
Date Tue, 24 Jul 2012 18:31:34 GMT

    [ 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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