[jira] Commented: (JCR-169) Make Jackrabbit clusterable

["Walter Raboch (JIRA)" <ji...@apache.org>]

    [ http://issues.apache.org/jira/browse/JCR-169?page=comments#action_12315903 ] 

Walter Raboch commented on JCR-169:
-----------------------------------

- extending LockManager to sync locks with other Nodes

- extending the ORM Layer (Hibernate with shared caching for performance) to save to a central DBMS
  (just working on this part)

OR

- Implement some sort of replication - so each node has an own filebased persistence 
  manager and the content is replicated to each node

- extending ObservationManager to send and receive Events to and from other nodes

- Lucene should be indepentend on each node but be aware of new nodes and changes.

- Config - the cluster should have a central place for config management

- some intelligence in the JCR-RMI client to find a content repository node from the cluster 
  dependending on node state (load, shutdown, ...)


> Make Jackrabbit clusterable
> ---------------------------
>
>          Key: JCR-169
>          URL: http://issues.apache.org/jira/browse/JCR-169
>      Project: Jackrabbit
>         Type: New Feature
>   Components: core
>     Reporter: Marcel Reutegger
>     Priority: Minor

>
> This jira issue discusses the technical implications on the current design of Jackrabbit to introduce clustering.
> Particularly the following areas require thorough investigation:
> - SharedItemStateManager and its cache
>     - cache integrity
>     - cache design: look aside, write through?
>     - hook for distributed cache, interface?
>     - isolation level
>     - transaction integrity within Jackrabbit, interaction with transient layer
> - VirtualItemStateProvider
>     - same strategy as SharedItemStateManager?
> - Search index
>     - single or per cluster node index?
> - Observation
> Please state more areas if needed.

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