[jboss-jira] [JBoss JIRA] Closed: (JBCACHE-1234) Region activation requests partial state transfer from wrong nodes

[Brian Stansberry (JIRA)]

     [ http://jira.jboss.com/jira/browse/JBCACHE-1234?page=all ]

Brian Stansberry closed JBCACHE-1234.
-------------------------------------

    Resolution: Done

Added method BuddyManager.getBackupDataOwners() to provide the correct set.  Added a bit to BuddyAssignmentStateTransferTest.testRegionBasedStateTransfer() to test for this problem.

> Region activation requests partial state transfer from wrong nodes
> ------------------------------------------------------------------
>
>                 Key: JBCACHE-1234
>                 URL: http://jira.jboss.com/jira/browse/JBCACHE-1234
>             Project: JBoss Cache
>          Issue Type: Bug
>      Security Level: Public(Everyone can see) 
>          Components: Clustering
>    Affects Versions: 2.0.0.GA, 1.4.1.SP7, 2.1.0.CR2
>            Reporter: Brian Stansberry
>         Assigned To: Brian Stansberry
>            Priority: Critical
>             Fix For: 1.4.1.SP8, 2.1.0.GA
>
>
> When requesting partial state transfer as part of activating a region, we are asking for state from the wrong nodes:
>             // Get the state from each DataOwner and integrate in their
>             // respective buddy backup cache
>             List<Address> buddies = buddyManager.getBuddyAddresses();
>             for (Address buddy : buddies)
>             {
>                List<Address> sources = new ArrayList<Address>(1);
>                sources.add(buddy);
>                Fqn buddyRoot = BuddyManager.getBackupFqn(buddy, fqn);
>                subtreeRoot = cache.findNode(buddyRoot);
>                ....
>                cache.fetchPartialState(sources, fqn, subtreeRoot.getFqn());
>             }
>          }
> BuddyManager.getBuddyAddresses() returns the nodes who are backing up *our* data, not those for whom we are serving as a buddy. We want the state for the latter.  This comes from the package-private BuddyManager.buddyGroupsIParticipateIn field, so BuddyManager is going to have to expose that somehow.

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