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From "Julian Reschke (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (OAK-6421) Phase out JCR Locking support
Date Tue, 01 May 2018 15:26:00 GMT

    [ https://issues.apache.org/jira/browse/OAK-6421?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16459757#comment-16459757

Julian Reschke commented on OAK-6421:

What should happen if somebody tries to add the "mix:lockable" node type?

> Phase out JCR Locking support
> -----------------------------
>                 Key: OAK-6421
>                 URL: https://issues.apache.org/jira/browse/OAK-6421
>             Project: Jackrabbit Oak
>          Issue Type: Task
>          Components: jcr
>            Reporter: Marcel Reutegger
>            Priority: Major
>             Fix For: 1.10
> Oak currently has a lot of gaps in its JCR Locking implementation (see OAK-1962), which
basically makes it non-compliant with the JCR specification.
> I propose we phase out the support for JCR Locking because a proper implementation would
be rather complex with a runtime behaviour that is very different in a standalone deployment
compared to a cluster. In the standalone case a lock could be acquired very quickly, while
in the distributed case, the operations would be multiple orders of magnitude slower, depending
on how cluster nodes are geographically distributed.
> Applications that rely on strict lock semantics should use other mechanisms, built explicitly
for this purpose. E.g. Apache Zookeeper.
> To ease upgrade and migration to a different lock mechanism, the proposal is to introduce
a flag or configuration that controls the level of support for JCR Locking:
> - DISABLED: the implementation does not support JCR Locking at all. Methods will throw
UnsupportedRepositoryOperationException when defined by the JCR specification. 
> - DEPRECATED: the implementation behaves as right now, but logs a warn or error message
that JCR Locking does not work as specified and will be removed in a future version of Oak.
> In a later release (e.g. 1.10) the current JCR Locking implementation would be removed
entirely and unconditionally throw an exception.

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