[Building Sakai] Caching options for 10.x

[Stephen Marquard]

Hi all,

https://jira.sakaiproject.org/browse/KNL-1162 changes the MemoryService for 10.x and introduces some new properties which aren't yet documented in https://confluence.sakaiproject.org/display/DOC/Sakai+10+new+properties+and+permissions, so I have some questions.

If we enable:

memory.use.legacy=false

then the following warnings show up:


2014-06-26 14:29:52,991  WARN localhost-startStop-1 org.sakaiproject.memory.impl.BaseMemoryService - Creating MultiRefCache(org.sakaiproject.alias.api.AliasService.targetCache), GenericMultiRefCache is deprecated and will no longer work in the next release

2014-06-26 14:29:52,991  WARN localhost-startStop-1 org.sakaiproject.memory.impl.EhcacheMemoryService - Creating MultiRefCache(org.sakaiproject.alias.api.AliasService.targetCache), GenericMultiRefCache is not supported in the distributed MemoryService implementation, the refs handling will do nothing!


What does "the refs handling will do nothing" actually mean, in practical terms for a production system? Is it a genuine warning that one should care about?


Is it safe to use the new caching support WITHOUT a shared memory cache like Terracotta (as described at http://stackoverflow.com/questions/24145602/how-do-i-setup-session-replication-in-sakai-10) ?


Cheers

Stephen


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