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From "Thomas Mueller (JIRA)" <j...@apache.org>
Subject [jira] Commented: (JCR-1605) RepositoryLock does not work on NFS sometimes
Date Fri, 23 May 2008 07:55:55 GMT

    [ https://issues.apache.org/jira/browse/JCR-1605?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12599299#action_12599299
] 

Thomas Mueller commented on JCR-1605:
-------------------------------------

A configurable lock mechanism will also help support a 'file system less' repository (where
no files are stored at all). Use cases: database-based repository; in-memory repository (for
example for testing)

> 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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