[jboss-jira] [JBoss JIRA] (JGRP-1809) New discovery protocol to be used in conjunction with SHARED_LOOPBACK

[Bela Ban (JIRA)]

Bela Ban created JGRP-1809:
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             Summary: New discovery protocol to be used in conjunction with SHARED_LOOPBACK
                 Key: JGRP-1809
                 URL: https://issues.jboss.org/browse/JGRP-1809
             Project: JGroups
          Issue Type: Enhancement
            Reporter: Bela Ban
            Assignee: Bela Ban
            Priority: Minor
             Fix For: 3.5


Sometimes tests in the testsuite fail because the nodes run over SHARED_LOOPBACK fail to discover each other and therefore don't form a cluster. This can happen because discovery requests sent via PING are discarded on a full thread pool.
Because the default test stack doesn't have a MERGE protocol, members won't get merged back.

h5. GOAL
* Create a discovery protocol which always discovers other members registered with the same cluster 

h5. SOLUTION
* Instead of using SHARED_LOOPBACK to send and receive discovery requests, query SHARED_LOOPBACK directly for discovery information. E.g. if we have members A,B,C registered with cluster "demo" in SHARED_LOOPBACK, then a node D joining can fetch (via SHARED_LOOPBACK_PING) the PingData of A, B and C directly from SHARED_LOOPBACK.
This way, we won't have any failed test cases (run over SHARED_LOOPBACK) which fail because no other members were discovered. Also, discovery (even for the first node started in a cluster) is very fast, and we don't need the timeout at all.

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