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From "Kihwal Lee (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HDFS-3718) Datanode won't shutdown because of runaway DataBlockScanner thread
Date Tue, 24 Jul 2012 17:03:35 GMT
Kihwal Lee created HDFS-3718:

             Summary: 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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