Page History

...

[Note: Only TV 2 supporting - broker-side auto-registration and proper epoch fencing, do not want to maintain TV1 code. TV2 is already default option since 4.0]

__share_group_state schema unchanged 

 no ShareCoordinatorShard changes; no snapshot replay changes; no compatibility risk.

Inter-broker protocol unchanged

 existing handleAddPartitionsToTransaction accepts arbitrary TopicPartition; no new code path on TxnCoord side

State machine additions:

• New transient state TX_PENDING 
• On WriteTxnMarkers commit: TX_PENDING(ACCEPT) → ACKNOWLEDGED; same for RELEASE and REJECT.
• On WriteTxnMarkers abort: TX_PENDING(*) → back to ACQUIRED (lock continues; consumer can retry the work).

...