szetszwo commented on PR #6303:
URL: https://github.com/apache/ozone/pull/6303#issuecomment-1977073350

   > Moreover Node2PipelineMap contains ConcurrentHashMap<UUID, 
Set<PipelineID>> and two synchronized methods ...
   
   Since there are multiple nodes, removing `synchronized` can lead to an 
inconsistent state.  Suppose Pipeline `p` has datanodes [A, B, C] and we have 
the following two calls:
   1. addPipeline(p)
   2. removePipeline(p)
   
   With `synchronized`, all datanodes A, B, C will be added and then removed.
   
   Without `synchronized`, it may
   - add A, B
   - remove A, B, C
   - add C
   
   Then, C is not removed.


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