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From Apache Wiki <wikidi...@apache.org>
Subject [Jackrabbit Wiki] Update of "Clustering" by AlexanderKlimetschek
Date Fri, 03 Jul 2009 16:49:53 GMT
Dear Wiki user,

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The following page has been changed by AlexanderKlimetschek:
http://wiki.apache.org/jackrabbit/Clustering

The comment on the change is:
added info on how clustering and datastore work together

------------------------------------------------------------------------------
- Clustering in Jackrabbit works as follows: content is shared between all cluster nodes.
That means all Jackrabbit cluster nodes need access to the SAME persistent storage (persistence
manager and data store). The [PersistenceManagerFAQ persistence manager] must be clusterable
(eg. central database that allows for concurrent access); any DataStore (file or DB) is clusterable
by its very nature, as they store content by unique hash ids. However, each cluster node needs
its own (private) FileSystem and ["Search"] index.
+ Clustering in Jackrabbit works as follows: content is shared between all cluster nodes.
That means all Jackrabbit cluster nodes need access to the SAME persistent storage (persistence
manager and data store).
+ 
+ The persistence manager must be clusterable (eg. central database that allows for concurrent
access, see ["PersistenceManagerFAQ"]); any DataStore (file or DB) is clusterable by its very
nature, as they store content by unique hash ids. However, each cluster node needs its own
(private) FileSystem and ["Search"] index.
  
  Every change made by one cluster node is reported in a journal, which can be either file
based or written to some database.
  
@@ -11, +13 @@

   * Each cluster node must have its own repository configuration
   * Every cluster node must be assigned a unique ID
   * A journal type must be chosen, either based on files or stored in a database
-  * The persistence managers must store their data in the same, globally accessible location
+  * The persistence managers must store their data in the same, globally accessible location
(see ["PersistenceManagerFAQ"])
+  * A DataStore must always be shared between nodes, if used
  
  === Unique Cluster Node ID ===
  

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