poorbarcode opened a new pull request, #16727:
URL: https://github.com/apache/pulsar/pull/16727

   Master Issue: #15370
   
   ### Motivation
   
   see #15370
   
   ### Modifications
   
   In the original design of the transaction buffered writer, we use a 
scheduled executor to execute timed tasks. There are no scheduled executors 
that match this scenario, and It's a little expensive to have a new scheduled 
executor with 1 millis tick time, we should reuse the 
`PulsarService.brokerClientSharedTimer` instead to create a new scheduled 
executor.
   
   So we should make transaction buffered writer supports `io.netty.Timer`, to 
ensure that buffered writer can still use Scheduled executors in the future, we 
designed to support both.
   
   
   ### Documentation
   
   
   - [ ] `doc-required` 
     
   - [x] `doc-not-needed` 
     
   - [ ] `doc` 
   
   - [ ] `doc-complete`


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