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

[Dan Berindei (JIRA)]

Dan Berindei created ISPN-1860:
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             Summary: 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: Manik Surtani
             Fix For: 5.2.0.FINAL


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.


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