TakaHiR07 opened a new pull request, #20053:
URL: https://github.com/apache/pulsar/pull/20053

   ### Motivation
   
   When MLTransactionMetadataStore#updateTxnStatus concurrently, there is a 
case only one request succeed, other requests throw exception. 
   
   ### Modifications
   
   If the newStatus == txnMeta.status(), it should not throw exception to 
client. Which is the same as 
https://github.com/apache/pulsar/blob/7ea8741af265bd8554e7a52a29a4ed59cb749dea/pulsar-transaction/coordinator/src/main/java/org/apache/pulsar/transaction/coordinator/impl/MLTransactionMetadataStore.java#L385-L388
   
   1. judge "txnMetaListPair.getLeft().status() == newStatus" again after 
synchronize
   2. add test
   
   
   ### 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 -->
   - [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/TakaHiR07/pulsar/pull/4
   
   


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