jiangmocc opened a new pull request, #1499:
URL: https://github.com/apache/pulsar-client-go/pull/1499

   ### Motivation
   
   Fixes #1498.
   
   Transactional sends already set the transaction id on `CommandSend`, but the 
serialized `MessageMetadata` did not carry `txnid_most_bits` and 
`txnid_least_bits`. Brokers rely on the message metadata transaction id when 
handling transaction buffer entries, so aborted transactional publishes can 
leak as visible messages.
   
   ### Modifications
   
   - Set transaction id fields on `MessageMetadata` for single-message 
transactional sends.
   - Set transaction id fields on batch-level `MessageMetadata` for 
transactional batches.
   - Clear transaction id fields from reusable batch metadata and send command 
state after flushing.
   - Add focused unit tests for single-message metadata, batch metadata, and 
batch reset behavior.
   
   ### Verifying this change
   
   - [x] `GOWORK=off go test -v ./pulsar/internal -run 
"TestBatchBuilder(AddsTxnIDToMessageMetadata|ClearsTxnIDAfterFlush)" -count=1`
   - [x] `GOWORK=off go test -v ./pulsar -run TestUpdateMetaDataAddsTxnID 
-count=1`
   
   ### Does this pull request potentially affect one of the following parts:
   
   - Dependencies: no
   - The public API: no
   - The schema: no
   - The default values of configurations: no
   - The wire protocol: no
   
   ### Documentation
   
   - Does this pull request introduce a new feature? no
   


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