jeanouii commented on PR #1792:
URL: https://github.com/apache/activemq/pull/1792#issuecomment-4173868388

   @cshannon thanks for the review Chris.
   Good question — I did search through the codebase as much as I could
   
   - RegionBroker uses synchronized(dest)
   - AbstractRegion uses consumerChangeMutexMap
   - The synchronized(consumers) blocks inside Topic are on the internal 
CopyOnWriteArrayList
   - No BrokerFilter or wrapper synchronizes on the destination object
   
   Queue.doMessageSend() is already NOT synchronized
   
   I agree about the external plugin risk. There is nothing we can reallly do 
right?
   
   


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