[infinispan-issues] [JBoss JIRA] (ISPN-4743) Rebalance can hang after the coordinator and another node leave

[Dan Berindei (JIRA)]

Dan Berindei created ISPN-4743:
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             Summary: Rebalance can hang after the coordinator and another node leave
                 Key: ISPN-4743
                 URL: https://issues.jboss.org/browse/ISPN-4743
             Project: Infinispan
          Issue Type: Bug
          Components: Core, State Transfer
    Affects Versions: 7.0.0.Beta2
            Reporter: Dan Berindei
            Assignee: Dan Berindei
            Priority: Critical
             Fix For: 7.0.0.CR1


This caused a failure in {{ClusterTopologyManagerTest.testAbruptLeaveAfterGetStatus}}.

When the coordinator changes, the new coordinator first sends a {{CacheTopologyControlCommand(type=CH_UPDATE)}} to reset any ongoing rebalance, then a {{CacheTopologyControlCommand(type=REBALANCE_START)}} to start a new rebalance with the remaining members. If another node leaves afterwards, the coordinator sends yet another {{CacheTopologyControlCommand(type=CH_UPDATE)}} to remove the leaver from the CHs.

If one node (in this case the coordinator itself) processes the last {{CH_UPDATE}} before the other two commands, it will fail to confirm the rebalance, and the cache will stay in "rebalancing" state until another node joins or leaves.



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