[infinispan-issues] [JBoss JIRA] (ISPN-1860) HotRod client topology info can get out of sync with the server topology info

HotRod client topology info can get out of sync with the server topology info ----------------------------------------------------------------------------- Key: ISPN-1860 URL: https://issues.jboss.org/browse/ISPN-1860 Project: Infinispan Issue Type: Bug Components: Cache Server Affects Versions: 5.1.1.FINAL Reporter: Dan Berindei Assignee: Galder Zamarreño Fix For: 5.1.2.FINAL, 5.2.0.ALPHA1 Say we have a HotRod cluster with a JGroups view A1 [A, B]. A client makes a get request to A, and it receives topology id 1, with nodes [A, B]. Another node C joins the HotRod cluster, and the JGroups view becomes A2 [A, B, C]. It takes a certain time for C to finish joining the topology cache, so for a limited amount of time the topology cache on A only contains [A, B]. If the client makes another get request during this time interval, it will receive topology id 2, but still with nodes [A, B]. So its consistent hash will not contain C. Future requests from the same client will send topology id 2 to the server, so the server will believe that the client's CH is [A, B, C] and won't send another topology update until another JGroups view is installed (because of a join, leave, or merge). Note that this can happen even if the client had C in its initial host list, because topology updates override the initial host list.