[jboss-jira] [JBoss JIRA] Created: (JGRP-831) SEQUENCER: incorrect order of delivery when thread pool is used

[Bela Ban (JIRA)]

SEQUENCER: incorrect order of delivery when thread pool is used
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                 Key: JGRP-831
                 URL: https://jira.jboss.org/jira/browse/JGRP-831
             Project: JGroups
          Issue Type: Bug
            Reporter: Bela Ban
            Assignee: Bela Ban
             Fix For: 2.6.5, 2.7


SEQUENCER was written before the concurrent stack was added. We forgot to add a lock (similar to NAKACK and UNICAST) to it, so currently we have unordered delivery when a thread pool is used.

SOLUTION: acquire a lock before removing a message from the SeqnoTable and release the lock on delivery. The lock cannot be per sender, but has to be for all the senders because we have total (global) ordering requirements.

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