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

[Petr Jurak (JIRA)]

     [ https://issues.jboss.org/browse/ISPN-7461?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Petr Jurak updated ISPN-7461:
-----------------------------
              Status: Pull Request Sent  (was: Coding In Progress)
    Git Pull Request: https://github.com/infinispan/infinispan/pull/5015


> 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
>
> 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).



--
This message was sent by Atlassian JIRA
(v7.2.3#72005)