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- EndTxn(COMMIT) transitions the transaction to PREPARE_COMMIT in __transaction_state
- WriteTxnMarkers dispatches commit markers to all partitions (data topics, __consumer_offsets, and now __share_group_state)
- When all markers are confirmed, state transitions to COMPLETE_COMMIT
Transaction metadata stays in __transaction_state.
Share acks are written transactionally to __share_group_state using CoordinatorRuntime.scheduleTransactionalWriteOperation().
6. Wire Protocol Details
TxnShareAcknowledgeRequest
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