[jboss-jira] [JBoss JIRA] Created: (JGRP-1289) TCP: multicasting should be restricted to current members

[Bela Ban (JIRA)]

TCP: multicasting should be restricted to current members
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                 Key: JGRP-1289
                 URL: https://issues.jboss.org/browse/JGRP-1289
             Project: JGroups
          Issue Type: Task
            Reporter: Bela Ban
            Assignee: Bela Ban
             Fix For: 2.12


In TP.down(), when TCP is used as transport, BasicTCP.sendMulticast() calls sendToAllPhysicalAddresses(). This method grabs all physical addresses from the cache and sends the message to each of them in turn.
However, this is problematic in the following case:
- {A,B,C}
- C is stopped (CTRL-Z)
- After some time, A installs view {A,B}
- This marks C in the cache as 'removed', but the list of physical addresses is still {A,B,C}, so when we multicast to the group, we send to A, B *and* C !
- The send to C will block at some point (as C is stopped), therefore the sending thread will block !
- Even if we use send queues in TCP, after some time, the send queue of C will fill up and the addition to the queue will block

SOLUTION: send a group multicast only to elements in the cache which are not marked as 'removable'.

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