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https://issues.apache.org/jira/browse/JCR-1605?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12597907#action_12597907
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Alexander Klimetschek commented on JCR-1605:
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> The message "No locks available" sounds like there is a number of locks, and
> if more locks are used this exception occurs.
No, this error message meant that the file system does not provide the file
locking feature at all. An NFS 2 or 3 was used which don't have the feature at
all. Only NFS 4 allows locking. But it's not recommended to rely on it.
Anyway, I would also be against an automatic mix of lock algorithms. For
example, current file locking might work perfectly on the NFS server, since it
accesses the local file system directly, which will most probably provide file
locking. Another jackrabbit running as an NFS (2/3) client, accessing the same
repository directory, would get an exception "No locks available". If it would
continue with another algorithm, it will not see the repository as locked and
start it.
> 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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