dao-jun opened a new pull request, #21739:
URL: https://github.com/apache/pulsar/pull/21739

   PIP:  I'm not sure if the PR needs a PIP
   
   ### Motivation
   
   In https://github.com/apache/pulsar/pull/19035 we introduced `skipCondition` 
before read entries from ledger. 
   
   It filters out delay-messages for the purpose of optimizing performance: to 
avoid reading unnecessary entries  to save memory usage, network usage and 
reduce latency of reading entries.
   
   As the same purpose, this PR wants to filter-out deleted entries before 
reading entries from ledger to optimize performance.
   
   This PR won't change the semantics of `readEntries` , it  just made some 
enhancements.
   
   ### Modifications
   
   <!-- Describe the modifications you've done. -->
   
   ### Verifying this change
   
   - [ ] Make sure that the change passes the CI checks.
   
   *(Please pick either of the following options)*
   
   This change is a trivial rework / code cleanup without any test coverage.
   
   *(or)*
   
   This change is already covered by existing tests, such as *(please describe 
tests)*.
   
   *(or)*
   
   This change added tests and can be verified as follows:
   
   *(example:)*
     - *Added integration tests for end-to-end deployment with large payloads 
(10MB)*
     - *Extended integration test for recovery after broker failure*
   
   ### Does this pull request potentially affect one of the following parts:
   
   <!-- DO NOT REMOVE THIS SECTION. CHECK THE PROPER BOX ONLY. -->
   
   *If the box was checked, please highlight the changes*
   
   - [ ] Dependencies (add or upgrade a dependency)
   - [ ] The public API
   - [ ] The schema
   - [ ] The default values of configurations
   - [ ] The threading model
   - [ ] The binary protocol
   - [ ] The REST endpoints
   - [ ] The admin CLI options
   - [ ] The metrics
   - [ ] Anything that affects deployment
   
   ### 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 -->
   - [ ] `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: <!-- ENTER URL HERE -->
   


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