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From "Tsz Wo (Nicholas), SZE (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HDFS-3846) Namenode deadlock in branch-1
Date Thu, 23 Aug 2012 09:11:42 GMT
Tsz Wo (Nicholas), SZE created HDFS-3846:
--------------------------------------------

             Summary: Namenode deadlock in branch-1
                 Key: HDFS-3846
                 URL: https://issues.apache.org/jira/browse/HDFS-3846
             Project: Hadoop HDFS
          Issue Type: Bug
          Components: name-node
            Reporter: Tsz Wo (Nicholas), SZE
            Assignee: Brandon Li


Jitendra found out the following problem:
1. Handler : Acquires namesystem lock waits on SafemodeInfo lock at SafeModeInfo.isOn()
2. SafemodeMonitor : Calls SafeModeInfo.canLeave() which is synchronized so SafemodeInfo lock
is acquired, but this method also causes following call sequence needEnter() -> getNumLiveDataNodes()
-> getNumberOfDatanodes() -> getDatanodeListForReport() -> getDatanodeListForReport()
. The getDatanodeListForReport is synchronized with FSNamesystem lock.

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