[infinispan-issues] [JBoss JIRA] (ISPN-7461) Cache is not rebalanced on merge

Cache is not rebalanced on merge -------------------------------- Key: ISPN-7461 URL: https://issues.jboss.org/browse/ISPN-7461 Project: Infinispan Issue Type: Bug Components: State Transfer Affects Versions: 5.2.7.Final Reporter: Dennis Reed Assignee: Petr Jurak Fix For: 5.2.21.Final After a cluster split and merge, the consistent hash is not balanced between the members. For example in a 2-member cluster, after the merge one node will be primary owner of every segment. In In a larger cluster, some nodes will not own any data. DefaultConsistentHash{numSegments=60, numOwners=2, members=[RehashAfterPartitionMergeTest-NodeB-49100, RehashAfterPartitionMergeTest-NodeA-11552]} -- 0: 0 1, 1: 0 1, 2: 0 1, 3: 0 1, 4: 0 1, 5: 0 1, 6: 0 1, 7: 0 1, 8: 0 1, 9: 0 1, 10: 0 1, 11: 0 1, 12: 0 1, 13: 0 1, 14: 0 1, 15: 0 1, 16: 0 1, 17: 0 1, 18: 0 1, 19: 0 1, 20: 0 1, 21: 0 1, 22: 0 1, 23: 0 1, 24: 0 1, 25: 0 1, 26: 0 1, 27: 0 1, 28: 0 1, 29: 0 1, 30: 0 1, 31: 0 1, 32: 0 1, 33: 0 1, 34: 0 1, 35: 0 1, 36: 0 1, 37: 0 1, 38: 0 1, 39: 0 1, 40: 0 1, 41: 0 1, 42: 0 1, 43: 0 1, 44: 0 1, 45: 0 1, 46: 0 1, 47: 0 1, 48: 0 1, 49: 0 1, 50: 0 1, 51: 0 1, 52: 0 1, 53: 0 1, 54: 0 1, 55: 0 1, 56: 0 1, 57: 0 1, 58: 0 1, 59: 0 1 This is triggered consistently by the RehashAfterPartitionMergeTest test case, but is not caught because it does not sufficiently check the consistent hash. (it checks RebalancePolicy.isBalanced, which merely makes sure each segment has the correct number of owners, not that it's evenly distributed).