[infinispan-issues] [JBoss JIRA] (ISPN-4766) Cache can't start if coordinator leaves during join and joiner becomes the new coordinator

[Dan Berindei (JIRA)]

Dan Berindei created ISPN-4766:
----------------------------------

             Summary: Cache can't start if coordinator leaves during join and joiner becomes the new coordinator
                 Key: ISPN-4766
                 URL: https://issues.jboss.org/browse/ISPN-4766
             Project: Infinispan
          Issue Type: Bug
          Components: Core
    Affects Versions: 7.0.0.Beta2
            Reporter: Dan Berindei
            Assignee: Dan Berindei
             Fix For: 7.0.0.CR1


When the joiner becomes the coordinator, it tries to recover the current cache topologies, but it receives just one expected member and no current topology. This causes a NPE in ClusterCacheStatus:

{noformat}
22:51:49,547 ERROR (transport-thread-NodeB-p21124-t1:) [ClusterCacheStatus] ISPN000228: Failed to recover cache dist state after the current node became the coordinator
java.lang.NullPointerException
	at org.infinispan.partionhandling.impl.PreferAvailabilityStrategy.onPartitionMerge(PreferAvailabilityStrategy.java:104)
	at org.infinispan.topology.ClusterCacheStatus.doMergePartitions(ClusterCacheStatus.java:452)
	at org.infinispan.topology.ClusterTopologyManagerImpl.recoverClusterStatus(ClusterTopologyManagerImpl.java:260)
	at org.infinispan.topology.ClusterTopologyManagerImpl.handleClusterView(ClusterTopologyManagerImpl.java:180)
	at org.infinispan.topology.ClusterTopologyManagerImpl$ClusterViewListener$1.run(ClusterTopologyManagerImpl.java:427)
{noformat}

The LocalTopologyManagerImpl waits a bit after receiving the SuspectException and tries again, but this time it receives a {@code null}  initial topology, causing another NPE:

{noformat}
22:51:51,319 DEBUG (testng-GlobalKeySetTaskTest:) [LocalTopologyManagerImpl] Error sending join request for cache dist to coordinator
java.lang.NullPointerException
	at org.infinispan.topology.LocalTopologyManagerImpl.resetLocalTopologyBeforeRebalance(LocalTopologyManagerImpl.java:222)
	at org.infinispan.topology.LocalTopologyManagerImpl.handleTopologyUpdate(LocalTopologyManagerImpl.java:191)
	at org.infinispan.topology.LocalTopologyManagerImpl.join(LocalTopologyManagerImpl.java:105)
	at org.infinispan.statetransfer.StateTransferManagerImpl.start(StateTransferManagerImpl.java:108)
{noformat}

This keeps going on until the state transfer timeout expires.



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