Node can apply new topology after sending status response --------------------------------------------------------- Key: ISPN-5883 URL: https://issues.jboss.org/browse/ISPN-5883 Project: Infinispan Issue Type: Bug Components: Core, Test Suite - Core Affects Versions: 8.0.1.Final, 7.2.5.Final, 8.1.0.Alpha2 Reporter: Dan Berindei Assignee: Dan Berindei Priority: Critical Labels: testsuite_stability Fix For: 8.1.4.Final, 8.2.0.Beta1 {{LocalTopologyManagerImpl}} is responsible for sending the {{ClusterTopologyControlCommand(GET_STATUS)}} response, and when it sends the response it doesn't check the current view id against the new coordinator's view id. If the old coordinator already sent a topology update before the merge, that topology update might be processed after sending the status response. The new coordinator will send a topology update with a topology id of {{max(status response topology ids) + 1}}. The node will then process the topology update from the old coordinator, but it will ignore the topology update from the new coordinator with the same topology id. This is extra common in the partition handling tests, e.g. {{BasePessimisticTxPartitionAndMergeTest}} subclasses, because the test "injects" the JGroups view on each node serially, and often the 4th node sends the status response before it gets the new view. {noformat} 22:16:37,776 DEBUG (remote-thread-NodeD-p26-t6:[]) [LocalTopologyManagerImpl] Sending cluster status response for view 10 // Topology from NodeC 22:16:37,778 DEBUG (transport-thread-NodeD-p28-t2:[]) [LocalTopologyManagerImpl] Updating local topology for cache pes-cache: CacheTopology{id=8, rebalanceId=3, currentCH=DefaultConsistentHash{ns=60, owners = (4)[NodeA-37631: 15+15, NodeB-47846: 15+15, NodeC-46467: 15+15, NodeD-30486: 15+15]}, pendingCH=null, unionCH=null, actualMembers=[NodeC-46467, NodeD-30486]} // Later, topology from NodeA 22:16:37,827 DEBUG (transport-thread-NodeD-p28-t1:[]) [LocalTopologyManagerImpl] Ignoring late consistent hash update for cache pes-cache, current topology is 8: CacheTopology{id=8, rebalanceId=3, currentCH=DefaultConsistentHash{ns=60, owners = (4)[NodeA-37631: 15+15, NodeB-47846: 15+15, NodeC-46467: 15+15, NodeD-30486: 15+15]}, pendingCH=null, unionCH=null, actualMembers=[NodeA-37631, NodeB-47846, NodeC-46467, NodeD-30486]} {noformat} As a solution, we can delay sending the status response until we have the same view as the coordinator (or a later one). We already check that the sender is the current coordinator before applying a topology update, so this will guarantee that the we don't apply other topology updates from the old coordinator. Since the status request is only sent after the new view was installed, this will not introduce any delays in the vast majority of cases.