[jboss-jira] [JBoss JIRA] Created: (JGRP-925) TCPPING: not all nodes have all physical addresses

[Bela Ban (JIRA)]

TCPPING: not all nodes have all physical addresses
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                 Key: JGRP-925
                 URL: https://jira.jboss.org/jira/browse/JGRP-925
             Project: JGroups
          Issue Type: Bug
            Reporter: Bela Ban
            Assignee: Bela Ban
             Fix For: 2.8


- We have A and B
- TCPPING for A and B lists A and B as initial_hosts
- C's config lists only A as initial_hosts
- When C joins, it 'll ping only A, so it has information about A's physical address in its cache
- Plus, the discovery response from A also adds information about A to C's cache
- HOWEVER, C does not have the physical address of B, and B doesn't have the physical address of C !
--> When C multicasts a message, B will not receive it
--> When B multicasts a message, C will not receive it

The reason is that a discovery response from a node N only contains the logical-physical mapping for N, but not for other nodes.

SOLUTION: introduce property return_entire_cache. By default, this is false, but TCPPING sets it to true. When A gets the discovery request from C, it'll return information about A *and* B. When B wants to send a multicast, it'll skip C though, but on the next MERGE2, it'll get the physical address of C. Retransmission will then make sure C receives B previously dropped multicast 

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