horizonzy commented on PR #21096:
URL: https://github.com/apache/pulsar/pull/21096#issuecomment-1704754727

   > > > > It makes sense, we should print a debug log when the 
allGroupsBookieMapping is null.
   > > > 
   > > > 
   > > > Yes, sure.
   > > 
   > > 
   > > There is a case that needs discussed, we only update the rack config 
when the `opt.isPresent`. If the user deletes the zk nodes of path `/bookies`, 
the `opt.isPresent` will be false. Shall we delete the cached rack config or 
still use it?
   > 
   > @horizonzy We need to delete the cached rack configuration.
   
   What do you think of it? 


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