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

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.