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From "Jukka Zitting (JIRA)" <j...@apache.org>
Subject [jira] Updated: (JCR-314) Fine grained locking in SharedItemStateManager
Date Wed, 15 Feb 2006 21:55:11 GMT
     [ http://issues.apache.org/jira/browse/JCR-314?page=all ]

Jukka Zitting updated JCR-314:
------------------------------

    Fix Version: 1.1
        Version: 0.9

> Fine grained locking in SharedItemStateManager
> ----------------------------------------------
>
>          Key: JCR-314
>          URL: http://issues.apache.org/jira/browse/JCR-314
>      Project: Jackrabbit
>         Type: Improvement
>   Components: core
>     Versions: 0.9
>     Reporter: Marcel Reutegger
>     Priority: Minor
>      Fix For: 1.1

>
> The SharedItemStateManager (SISM) currently uses a simple read-write lock to ensure data
consistency. Store operations to the PersistenceManager (PM) are effectively serialized.
> We should think about more sophisticated locking to allow concurrent writes on the PM.
> One possible approach:
> If a transaction is currently storing data in a PM a second transaction may check if
the set of changes does not intersect with the first transaction. If that is the case it can
safely store its data in the PM.
> This fine grained locking must also be respected when reading from the SISM. A read request
for an item that is currently being stored must be blocked until the store is finished.

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