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Cross-Version Client/Broker Matrix
| Client | Broker, share.version=2 | Broker, share.version=1 | Old broker (no binary) |
|---|---|---|---|
| New | Works | UnsupportedVersionException (synchronous, no wire bytes) | Same |
| Old | Unaffected | Unaffected | Unaffected |
Downgrade
1. Drain in-flight TX_PENDING:
- Halt producers calling sendShareAcknowledgementsToTransaction
- Wait for transaction.timeout.ms (default 60s) for any abandoned txns to clear
2. kafka-features.sh downgrade --feature share.version --version 1
Broker rejects the downgrade RPC if any in-memory TX_PENDING exists, preventing data inconsistency.
Software downgrade (binary): must follow feature downgrade; standard rolling restart.
Test Plan
The verification strategy focuses on state machine integrity and fault tolerance under high-concurrency and failure scenarios.
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