[jboss-jira] [JBoss JIRA] (JGRP-2180) (7.0.z) UNICAST3: bypass or remove when running over TCP

[Bartosz Spyrko-Śmietanko (JIRA)]

Bartosz Spyrko-Śmietanko created JGRP-2180:
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             Summary: (7.0.z) UNICAST3: bypass or remove when running over TCP
                 Key: JGRP-2180
                 URL: https://issues.jboss.org/browse/JGRP-2180
             Project: JGroups
          Issue Type: Enhancement
            Reporter: Bartosz Spyrko-Śmietanko
            Assignee: Bela Ban
            Priority: Minor
             Fix For: 3.6.11, 4.0


When running over TCP as transport, UNICAST3 is still required: while TCP/IP retransmits messages reliably and also provides sender-FIFO ordering, the receiver's thread pool might be exhausted and thus the message might get rejected.

However, *if* the regular and OOB thread pools are disabled, we could actually bypass (or completely remove) UNICAST3. If messages get dropped by a protocol further up the stack, however, there will be no retransmission in this case.

SOLUTION:
* Document this behavior
* Emit an INFO message (or automatically bypass UNICAST3) when run over a TCP transport and both OOB and regular pools are disabled



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