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

[Bela Ban (JIRA)]

MERGE4: get rid of shunning and use only merging (getting rid of shunfests)
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                 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: 2.6.9


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)

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