mattisonchao opened a new pull request, #21463:
URL: https://github.com/apache/pulsar/pull/21463

   ### Motivation
   
   Refactor method BrokerService#unloadServiceUnit to improve exception 
handling, logging and method call.
   
   ### Modifications
   
   - Add parameters NPE check
   - Ignore the exception of `topicCreationFuture` 
   
   > We should ignore the exception from topic creation future. It will give 
the caller a precise exception related to topic closing.
   
   - throw `TimeoutException` when the method running timeout.
   
   > As a public method, we should let users decide what they want to do when 
the method runs timeout. Plus, I checked all the usage of this method and all 
of them ignore the exception directly. It shouldn't be a breaking change.
   
   ### Verifying this change
   
   - [x] Make sure that the change passes the CI checks.
   
   
   ### 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 -->
   


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