[jira] Commented: (JCR-314) Fine grained locking in SharedItemStateManager

["Michael Neale (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/JCR-314?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12479899 ] 

Michael Neale commented on JCR-314:
-----------------------------------

anyone for escalating this above a "minor" - its kind of a showstopper for some people ?

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

-- 
This message is automatically generated by JIRA.
-
You can reply to this email to add a comment to the issue online.