Hey Kevin,
As your suggestion, today I take a look at /ZimbraServer/src/java/com/zimbra/cs/account/ldap/LdapProvisioning.java (many thx to the Eclipse team for the wonderful Java Browsing perspective
).
After browsing a while, I think that memcached may help, especially for caching LDAP data. As far as I know, you havent got a centralized cache storage because each LRU cache is only available to its local zimbra-store. So there're probably objects stored the same in multiple zimbra-store servers. If we just have only one zimbra-store server, there's no benefit in using memcached but in a (very) large scale (as the one I'm going to deploy), memcached does help a lot.
Do you have any plan to integrate memcached into zimbra? I think it wont take a lot of time. I can hack myself but I wonder whether you will integrate it to zimbra. I just dont want to use a heavy-patched Zimbra version (and busy patching when you guys release a new version with a lot of cool features!). Please advise.
-g.