[jboss-jira] [JBoss JIRA] Created: (JGRP-628) Discovery: add cluster name to discovery request to be able to discard responses from different clusters

[Bela Ban (JIRA)]

Discovery: add cluster name to discovery request to be able to discard responses from different clusters
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                 Key: JGRP-628
                 URL: http://jira.jboss.com/jira/browse/JGRP-628
             Project: JGroups
          Issue Type: Feature Request
            Reporter: Bela Ban
         Assigned To: Bela Ban
             Fix For: 2.6.1, 2.7


When we have 2 groups ONE and TWO:
ONE: 228.8.8.8:7500 and
TWO: 228.1.2.3:7500

In some cases, they will receive each other's traffic (http://wiki.jboss.org/wiki/Wiki.jsp?page=PromiscuousTraffic). 
Assume ONE has members {A,B,C} and TWO has no members yet. When D (in cluster TWO) starts up and sends out a discovery request, it might also receive discovery responses from ONE (A,B,C). D might now identify A as coordinator and send a JOIN-REQ to A. However, A will discard that request as the group name of D's request is TWO rather than ONE !
Result: D's JOIN-REQ will hang !

Note that the transport (TP) does drop messages from different clusters, but this happens only after the new member has joined the group, so discovery requests/responses from different groups are *not* discarded.

Tasks: 
- Verify that the transport-name matching algorithm in TP is correct
- Confirm that - on initial discovery - discovery requests and responses are not matched

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