Problem reoccurred last night https://builds.apache.org/view/M-R/view/Qpid/job/Qpid-Java-Java-BDB-TestMatrix/521/jdk=JDK%201.6%20%28latest%29,label=Ubuntu,profile=java-bdb.0-9-1/testReport/junit/org.apache.qpid.server.store.berkeleydb/HAClusterManagementTest/testRemoveNodeFromGroup/.
From the logs we can see that the test is allowing itself to observe the number of nodes in the group whilst nodes are still forming the group. The test does await the start-up of each broker, but the successful startup of the broker does not mean that that node within (corresponding the virtual host) is yet in contact with others in the group.
This wont cause a production issue, but does cause an issue for the test which is trying to make pre-test assertions about that state of the group.
Adding code so that the test awaits the group to be fully formed will workaround the issue. In the long-term, I'd prefer to see JMX notifications being used so a client can hear the node joining or leaving the group.