[infinispan-dev] Reliability of return values

Hi, recently I've stumbled upon one already expected behaviour (one instance is [1]), but which did not got much attention. In non-tx cache, when the primary owner fails after the request has been replicated to backup owner, the request is retried in the new topology. Then, the operation is executed on the new primary (the previous backup). The outcome has been already fixed in [2], but the return value may be wrong. For example, when we do a put, the return value for the second attempt will be the currently inserted value (although the entry was just created). Same situation may happen for other operations. Currently, it's not possible to return the correct value (because it has already been overwritten and we don't keep a history of values), but shouldn't we rather throw an exception if we were not able to fulfil the API contract? Radim [1] https://issues.jboss.org/browse/ISPN-2956 [2] https://issues.jboss.org/browse/ISPN-3422 -- Radim Vansa <rvansa(a)redhat.com&gt; JBoss DataGrid QA