[jbosscache-issues] [JBoss JIRA] Commented: (JBCACHE-1549) Buddy pool tracking when 2nd to last member leaves group

[Brian Stansberry (JIRA)]

    [ https://jira.jboss.org/jira/browse/JBCACHE-1549?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12489458#action_12489458 ] 

Brian Stansberry commented on JBCACHE-1549:
-------------------------------------------

The testsuite ran OK with that block commented it out (had 3 failures but seemed unrelated). So I committed that; I'll let hudson have a go at it and if it looks ok will assign this to myself and resolve it.

> Buddy pool tracking when 2nd to last member leaves group
> --------------------------------------------------------
>
>                 Key: JBCACHE-1549
>                 URL: https://jira.jboss.org/jira/browse/JBCACHE-1549
>             Project: JBoss Cache
>          Issue Type: Bug
>      Security Level: Public(Everyone can see) 
>          Components: Buddy Replication
>    Affects Versions: 3.2.1.GA
>            Reporter: Brian Stansberry
>            Assignee: Manik Surtani
>            Priority: Critical
>
> If you have a 2 node cluster with buddy replication, and you restart one node, that node does not receive a state transfer. See forum thread for details of the exact symptoms.
> Problem is this in BuddyManager$AsyncViewHandlerThread.handleEnqueuedViewChange():
>          // there is a strange case where JGroups issues view changes and just includes self in new views, and then
>          // quickly corrects it.  Happens intermittently on some unit tests.  If this is such a case, please ignore.
>          if (members.newMembers.size() == 1 && members.newMembers.get(0).equals(cache.getLocalAddress()))
>          {
>             log.info("Ignoring membership change event since it only contains self.");
>             return;
>          }
> Problem is the if condition is always true when the 2nd to last member leaves the group, but returning leaves the last member in a state where it thinks the next to last member is still a buddy. When that node restarts and rejoins the group, the reassign buddies logic sees that the new member is already a buddy and returns without pushing state.

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