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http://jira.magnolia-cms.com/browse/MAGNOLIA-3905?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Christopher Zimmermann updated MAGNOLIA-3905:
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Fix Version/s: 5.0
(was: 5.0 Alpha1 s010)
> Remove usage of ExclusiveWrite
> ------------------------------
>
> Key: MAGNOLIA-3905
> URL: http://jira.magnolia-cms.com/browse/MAGNOLIA-3905
> Project: Magnolia
> Issue Type: Task
> Security Level: Public
> Components: core
> Reporter: Fabrizio Giustina
> Assignee: Daniel Lipp
> Priority: Major
> Fix For: 5.0
>
>
> Performances of concurrent editing in Magnolia is highly affected of the
> global sinchronization on ExclusiveWrite, expecially due to the usage in
> SaveHandlerImpl.
> ExclusiveWrite was more a quick and dirty hack than a solution to concurrency
> implemented years ago. The main reason why it's bad is that is global: no
> matter which node you are saving or which repository you are working on, you
> will hold a lock which will block any other dialog from saving. That means
> that also saving a document to the dms or anything else into the data module
> is actually locking the whole system for editing.
> A second reason why it's bad: it has totally no effect on clustered
> instances, since it's local to a single Magnolia instance. IF the problem
> it's trying to fix is concrete, synchronization should be done on a
> repository level, not at instance level.
> A good approach would be using jcr locks on nodes (locking works also with a
> clustered repository).
> Since Magnolia actually uses a "soft locking" approach everywhere, by
> allowing concurrent editing assuming that concurrent save operation on the
> same node would be really limited, my suggestion is to simply get rid of the
> synchronization block in SaveHandlerImpl, without introducing addictional
> checks at the moment.
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