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