[jboss-jira] [JBoss JIRA] Commented: (JBCACHE-471) Handle JGroups MERGE

Tue Dec 4 08:04:52 EST 2007

    [ http://jira.jboss.com/jira/browse/JBCACHE-471?page=comments#action_12390431 ] 

Manik Surtani commented on JBCACHE-471:
---------------------------------------

Decided to provide a policy based approach here.  When we get a JGroups notification of a merge, provide plugins that allow for:

1) Evict entire cluster state (useful with Hibernate)
2) Evict cache state of the losing sub-cluster
3) Throw exception, stop cache (useful if we need to force some manual cleanup)
4) Perform merging of disjointed subtrees.  (Maybe later - this "plugin" could be released in future)

> Handle JGroups MERGE
> --------------------
>
>                 Key: JBCACHE-471
>                 URL: http://jira.jboss.com/jira/browse/JBCACHE-471
>             Project: JBoss Cache
>          Issue Type: Task
>      Security Level: Public(Everyone can see) 
>    Affects Versions: 1.2.4
>            Reporter: Manik Surtani
>         Assigned To: Manik Surtani
>             Fix For: 2.2.0.GA
>
>
> When JGroups needs to do a merge due to a temporary break in the group structure, JGroups does not handle the merging of data.  This is usually left up to the application to handle.
> JBossCache should support pluggable merge policies, we could provide some simple merge policies and allow users to write their own.
> 1.  Evict on merge policy - when a merge occurs, evict the entire in-memory state.  Useful for Hibernate or when used with a shared cache loader.
> 2.  Other merge algos ... ?

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