[hibernate-issues] [Hibernate-JIRA] Commented: (HHH-3952) Enabling second level caching at runtime

Enabling second level caching at runtime ---------------------------------------- Key: HHH-3952 URL: http://opensource.atlassian.com/projects/hibernate/browse/HHH-3952 Project: Hibernate Core Issue Type: New Feature Components: caching (L2) Reporter: Galder Zamarreno To be able to extend rolling upgrade strategies such as the one explained in http://www.jboss.org/community/docs/DOC-10910 to situations where 2nd level cache is used, some kind of dynamic switch for 2nd level cache would be required. The requirement comes from the fact that while the old cluster is running, users could update entities in the 2nd level cache after these entities have been read and loaded into the 2nd level cache in the new cluster. Since the old cluster and the new cluster does not communicate directly, invalidation messages from the old cluster would not be received by the new cluster and hence, the new cluster could be interacting with stale data. The most sensible thing here IMO would be to start the new cluster with 2nd level cache disabled and at some point, when the old cluster has been completely shut down, turn it on again. This would require exposing some kind of control to be able to do the switch. for example via JMX.