[jboss-jira] [JBoss JIRA] Created: (JGRP-716) TCP based configs need UNICAST for correct ordering

[Bela Ban (JIRA)]

TCP based configs need UNICAST for correct ordering
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                 Key: JGRP-716
                 URL: http://jira.jboss.com/jira/browse/JGRP-716
             Project: JGroups
          Issue Type: Task
            Reporter: Bela Ban
         Assigned To: Bela Ban
             Fix For: 2.6.3, 2.7


In a TCP based config *without* UNICAST, messages can get delivered out of order if a thread pool is enabled at the transport level. Example:
- Sender A sends unicast messages (same for multicast messages) M1, M2 and M3 to B
- B's transport dispatches the 3 messages to a thread pool (if bundling is enabled, then this issue might not occur as all 3 messages might have gotten bundled, and will then get delivered as a bundle, by the same thread)
- M1 is processed by thread-1, M2 by thread-2 and M3 by thread-3
==> There are no guarantees with respect to ordering now, as thread pool destroyed ordering and there is no UNICAST to make sure messages arriving in different threads get ordered accoring to sequence number

TODO: ship all TCP based protocols with UNICAST

WORKAROUND: disable the thread pool(s) in the TCP transport

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