horizonzy commented on PR #3721:
URL: https://github.com/apache/bookkeeper/pull/3721#issuecomment-1410127159

   > @horizonzy Nice catch!
   > 
   > I have a question, if the user has a 30-node bookie cluster, 20 of which 
are rackA, and the other 10 are rackB, and the user has not enabled 
minNumRacksPerWriteQuorum and enforceMinNumRacksPerWriteQuorum;
   > 
   > Now the user upgrades the pulsar cluster, the modification brought by this 
PR will be enabled, Will it happen that the data between the two racks is 
basically evenly distributed, resulting in double the traffic and storage 
pressure of rackB with only 10 nodes?
   > 
   > In the random selection process of the old version, in theory, the traffic 
carried by rackA should be twice that of rackB.
   > 
   > Do we need to pay attention to this?
   
   After this pr, the traffic carried by rackA is still twice that of rackB. 


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