wy96f commented on issue #2703: ARTEMIS-2380 Fix delivering message in the case of consume close URL: https://github.com/apache/activemq-artemis/pull/2703#issuecomment-526044726 > No need for sync. Theres a new addsorted method that will put back in order so if you call that instead of head problem gone The sync is to make sure consumer not added in QueueImpl while transaction is committing or rollbacking. Without sync block, there is chance that consumer would be added in QueueImpl and never be removed bcs afterCommit/afterRollback has been called before it.
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