poorbarcode opened a new pull request, #21232:
URL: https://github.com/apache/pulsar/pull/21232

   ### Motivation
   
   Multiple consumers and producers can be maintained by the same Pulsar 
Client. In some cases, multiple consumers or producers might attempt to connect 
to the same topic. To optimize the process, it is recommended to perform the 
topic lookup only once for each topic.
   
   ### Modifications
   
   - Merge lookup requests for the same topic.
   - Merge get partitioned metadata request for the same partitioned topic.
   
   
   ### Documentation
   
   <!-- DO NOT REMOVE THIS SECTION. CHECK THE PROPER BOX ONLY. -->
   
   - [ ] `doc` <!-- Your PR contains doc changes. -->
   - [ ] `doc-required` <!-- Your PR changes impact docs and you will update 
later -->
   - [x] `doc-not-needed` <!-- Your PR changes do not impact docs -->
   - [ ] `doc-complete` <!-- Docs have been already added -->
   
   ### Matching PR in forked repository
   
   PR in forked repository: x


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