[jboss-jira] [JBoss JIRA] Resolved: (JGRP-937) MERGE4: get rid of shunning and use only merging (getting rid of shunfests)

MERGE4: get rid of shunning and use only merging (getting rid of shunfests) --------------------------------------------------------------------------- Key: JGRP-937 URL: https://jira.jboss.org/jira/browse/JGRP-937 Project: JGroups Issue Type: Feature Request Reporter: Bela Ban Assignee: Bela Ban Fix For: 2.8 Attachments: udp-2.6.xml If we have FD_ALL plus shunning, the following scenario can happen: - A network partition with subgroups {A} and {B,C,D,E,F,G} - The partition heals - A gets heartbeats from all members of the 2nd subgroup - A's FD_ALL.shun will shun all members of the 2nd subgroup ! - And vice versa, this leads to a shunfest and large clusters might never merge back again SOLUTION: - Get rid of shunning (GMS.shun is false by default anyway, now also set FD/FD_ALL.shun to false) - MERGE4 periodically compares discovery results to its view (- This might be done a few times) - Then MERGE4 initiates a merge between all members who have differing views - Make sure digests get merged correctly (min/max)