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

SEQUENCER: incorrect order of delivery when thread pool is used --------------------------------------------------------------- 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.