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From "Todd Lipcon (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-2877) If locking of a storage dir fails, it will remove the other NN's lock file on exit
Date Thu, 02 Feb 2012 17:14:54 GMT

    [ https://issues.apache.org/jira/browse/HDFS-2877?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13198983#comment-13198983
] 

Todd Lipcon commented on HDFS-2877:
-----------------------------------

Uma's got it -- the RandomAccessFile constructor will create the file, but then, if we fail
to lock that file we just created, we wouldn't clean it up. (eg if the underlying system is
an NFS mount without NLM)
                
> If locking of a storage dir fails, it will remove the other NN's lock file on exit
> ----------------------------------------------------------------------------------
>
>                 Key: HDFS-2877
>                 URL: https://issues.apache.org/jira/browse/HDFS-2877
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: name-node
>    Affects Versions: 0.23.0, 0.24.0, 1.0.0
>            Reporter: Todd Lipcon
>            Assignee: Todd Lipcon
>         Attachments: hdfs-2877.txt
>
>
> In {{Storage.tryLock()}}, we call {{lockF.deleteOnExit()}} regardless of whether we successfully
lock the directory. So, if another NN has the directory locked, then we'll fail to lock it
the first time we start another NN. But our failed start attempt will still remove the other
NN's lockfile, and a second attempt will erroneously start.

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