Github user michaelandrepearce commented on a diff in the pull request: https://github.com/apache/activemq-artemis/pull/1827#discussion_r165282202 --- Diff: artemis-server/src/main/java/org/apache/activemq/artemis/core/server/impl/RefsOperation.java --- @@ -152,14 +153,14 @@ protected void rollbackRedelivery(Transaction tx, MessageReference ref, long tim @Override public void afterCommit(final Transaction tx) { for (MessageReference ref : refsToAck) { - synchronized (ref.getQueue()) { --- End diff -- if this is removed should the same syn block on the queue in rollback be removed, im not 100% if this is safe though or not, is there a concurrent test case at all around this if not, could one be easily added?
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