Blocker With the ISPN-4574 fix, I changed the merge algorithm to pick the partition with the most members (both in the stable topology and in the current topology) instead of the partition with the highest topology id.
However, the biggest topology is not necessarily the partition with the highest topology id, so it's possible that some nodes will ignore the merged topology because they already have a higher topology installed. This happened once in ClusterTopologyManagerTest.testClusterRecoveryAfterThreeWaySplit:
00:24:59,286 DEBUG (transport-thread-NodeL-p33097-t6:) [ClusterCacheStatus] Recovered 3 partition(s) for cache cache: [CacheTopology{id=8, rebalanceId=3, currentCH=DefaultConsistentHash{ns = 60, owners = (1)[, NodeL-25322: 60+0]}, pendingCH=null, unionCH=null}, CacheTopology{id=6, rebalanceId=3, currentCH=DefaultConsistentHash{ns = 60, owners = (2)[, NodeL-25322: 30+10, NodeN-6727: 30+10]}, pendingCH=DefaultConsistentHash{ns = 60, owners = (2)[, NodeL-25322: 30+30, NodeN-6727: 30+30]}, unionCH=null}, CacheTopology{id=5, rebalanceId=2, currentCH=DefaultConsistentHash{ns = 60, owners = (1)[, NodeM-12972: 60+0]}, pendingCH=null, unionCH=null}]
00:24:59,287 DEBUG (transport-thread-NodeL-p33097-t6:) [ClusterCacheStatus] Updating topologies after merge for cache cache, current topology = CacheTopology{id=5, rebalanceId=2, currentCH=DefaultConsistentHash{ns = 60, owners = (1)[, NodeM-12972: 60+0]}, pendingCH=null, unionCH=null}, stable topology = CacheTopology{id=4, rebalanceId=2, currentCH=DefaultConsistentHash{ns = 60, owners = (3)[, NodeL-25322: 20+20, NodeM-12972: 20+20, NodeN-6727: 20+20]}, pendingCH=null, unionCH=null}, availability mode = null
00:24:59,287 DEBUG (transport-thread-NodeL-p33097-t6:) [ClusterTopologyManagerImpl] Updating cluster-wide current topology for cache cache, topology = CacheTopology{id=5, rebalanceId=2, currentCH=DefaultConsistentHash{ns = 60, owners = (1)[, NodeM-12972: 60+0]}, pendingCH=null, unionCH=null}, availability mode = null
00:24:59,288 TRACE (transport-thread-NodeL-p33097-t3:) [LocalTopologyManagerImpl] Ignoring consistent hash update for cache cache, current topology is 8: CacheTopology{id=5, rebalanceId=2, currentCH=DefaultConsistentHash{ns = 60, owners = (1)[, NodeM-12972: 60+0]}, pendingCH=null, unionCH=null}
Failure logs here: http://ci.infinispan.org/viewLog.html?buildId=12364&buildTypeId=Infinispan_MasterHotspotJdk7trac&tab=buildResultsDiv
- relates to
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ISPN-4900 Split-brain: cancelled ST results in missing data
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- Closed
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