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From "Thomas Mueller (JIRA)" <j...@apache.org>
Subject [jira] Created: (JCR-1605) RepositoryLock does not work on NFS sometimes
Date Thu, 15 May 2008 15:39:55 GMT
RepositoryLock does not work on NFS sometimes
---------------------------------------------

                 Key: JCR-1605
                 URL: https://issues.apache.org/jira/browse/JCR-1605
             Project: Jackrabbit
          Issue Type: Bug
            Reporter: Thomas Mueller
            Assignee: Thomas Mueller


The RepositoryLock mechanism currently used in Jackrabbit uses FileLock. This doesn't work
on some NFS file system. It looks like only NFS version 4 and newer supports locking. Older
implementations may throw a IOException "No locks available", which means the NFS does not
support byte-range locking.

I propose to add a second locking mechanism, and add a configuration option to use it. For
example: <FileLocking class="acme" />. This second locking mechanism is a cooperative
locking protocol that uses a background (watchdog) thread and only uses regular file operations.



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