Hi Sacha,
thank you very much for your comments. Now I believe I have quite clean picture of partition merge issues.
Maybe the conditions and limitations you mentioned should be added to documentation as they are not obvious and there can be a lot of people living, as I did before, in paradise, where all the mess with state merging, is handled by clustering framework.
Maybe we should come up with a conflict resolution policy, similar to the failover policy: the policy is user-defined and - whenever there is a merge - it is called with all substates. At this point it needs to implement the merge and update the local copy.
For the state service we could for instance provide a simple default policy which applies the union of all states and sees this as the new state. The only requirement for such a policy is that it is deterministic.
-- Bela Ban www.javagroups.com (408) 316-4459
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