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From "Doug Cutting (JIRA)" <j...@apache.org>
Subject [jira] Updated: (HADOOP-726) HDFS locking mechanisms should be simplified or removed
Date Thu, 25 Jan 2007 21:03:49 GMT

     [ https://issues.apache.org/jira/browse/HADOOP-726?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Doug Cutting updated HADOOP-726:
--------------------------------

    Resolution: Fixed
        Status: Resolved  (was: Patch Available)

I just committed this.  Thanks, Raghu!

> HDFS locking mechanisms should be simplified or removed
> -------------------------------------------------------
>
>                 Key: HADOOP-726
>                 URL: https://issues.apache.org/jira/browse/HADOOP-726
>             Project: Hadoop
>          Issue Type: Improvement
>          Components: dfs
>            Reporter: Sameer Paranjpye
>         Assigned To: Raghu Angadi
>            Priority: Minor
>             Fix For: 0.11.0
>
>         Attachments: HADOOP-726-1.patch, HADOOP-726-2.patch, remove-fs-locks.patch
>
>
> HDFS includes a locking mechanism that allows clients to lock files and directories in
the filesystem. This requires that the Namenode, in addition to all other management of filesystem
state also has to act like a lock manager on behalf of clients. Rather than burden the Namenode
with this Hadoop should include a distinct general purpose distributed lock manager.
> In the interim, the locking functionality on the filesystem should be simplified to permit
only file locks or removed altogether. At this point, removing or simplifying the functionality
is not likely to break client code, removing it later will be much harder. In any case, locks
in HDFS don't work very well, see HADOOP-656. Also, directory locks are overkill most UNIX
fses don't support it.

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