poorbarcode opened a new pull request, #19346:
URL: https://github.com/apache/pulsar/pull/19346

   ### Motivation
   
   ML uses synchronized to guarantee the atomicity of modifications to 
variables `ledgers,` `currentLedger`, `currentLedgerEntries` and 
`currentLedgerSize`, but PR #16420 breaks atomicity, resulting in incorrect 
results when using those variables(E.g calculate backlog size by special 
position)
   
   ### Modifications
   
   Make changes to these variables within the synchronized block.
   
   
   ### Documentation
   
   <!-- DO NOT REMOVE THIS SECTION. CHECK THE PROPER BOX ONLY. -->
   
   - [ ] `doc` <!-- Your PR contains doc changes. Please attach the local 
preview screenshots (run `sh start.sh` at `pulsar/site2/website`) to your PR 
description, or else your PR might not get merged. -->
   - [ ] `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: 
   - https://github.com/poorbarcode/pulsar/pull/56
   


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