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From "Emmanuel Lecharny (JIRA)" <j...@apache.org>
Subject [jira] Created: (DIRSERVER-959) We nedd a global cache
Date Tue, 05 Jun 2007 18:37:26 GMT
We nedd a global cache 
-----------------------

                 Key: DIRSERVER-959
                 URL: https://issues.apache.org/jira/browse/DIRSERVER-959
             Project: Directory ApacheDS
          Issue Type: Improvement
    Affects Versions: 1.5.0
            Reporter: Emmanuel Lecharny
            Priority: Critical


Currently, we only have local caches assigned to each partition :
- a so called "global" cache which stores the partition entries
- a cache for each declared index

We also have real global caches :
- a cache for referrals
- a cache for ACIs (tuples)
- a cache for subentries
- a cache for principals
- a cache for Groups 
- a cache for notAlias entries

Up to this point, it becomes to be a full mess. We have so many different caches, with so
many different configurations, that it's almost impossible to know how to correctly tune the
server. Moreover, we may have empty caches when other are heavily hit.

After having discussed about this situation with Alex, we think wit would be better to have
a global cache shared between all the partitions, but with added functionnalities :
- the possibility to balance the cache between partitions (for instance, 20% for 'ou=system',
80% for 'dc=example, dc=com'
- the possibility to change this balance dynamically, depending on the actual hit rate
- the possibility to dedicate a part of this cach to pin some entries in memory (like the
schema partition entries, for instance)
- the possibility to increase or decrease the cache size dynamically, without having to stop
and restart the server

It would be also a good idea to be able to have a global Interface for all the cache we have,
and may be a cache manager instead of a specific implementation for each cache

Feel free to add comments in this JIRA !

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