This release, v2.2.9, brings several crucial bug fixes and improvements focused on node stability and performance. It is recommended to upgrade your Mainnet and Amoy nodes to this version.

Major Stability and Reorg Fixes

This update significantly enhances node stability, especially for validators. Key fixes address critical deadlock and panic issues that could occur in the miner during block production, particularly following a milestone-triggered reorganization. This prevents nodes from getting stuck and ensures they can continue functioning correctly after a reorg.

Another important fix resolves a potential state inconsistency during milestone verification. Previously, a node on a fork could fail to find a common ancestor, causing it to get stuck on the wrong chain. The new logic ensures nodes can correctly realign with the canonical chain.

New Configuration Flags for Data Retention

New flags have been added to give node operators more control over historical data retention, aligning Bor with upstream Geth. You can now use the following flags:
- `history.transactions`
- `history.logs`
- `history.state`

Please note that the `txlookuplimit` flag is now deprecated and will be fully replaced by `history.transactions` in a future release.

Performance and Other Improvements

- Commit Interrupt Optimization: The logic for interrupting block building to prevent delays has been refactored. This change significantly reduces CPU usage during the process, especially for blocks with a high gas limit.
- GRPC Startup Fix: A race condition at startup that could cause a panic if a GRPC call was made immediately after starting Bor has been resolved.
- Updated Fake Signer: The internal fake signer for pre-EIP-155 transactions has been updated from London to Prague.
- Cleaner Logs: An unnecessary "Impossible reorg" log that could appear has been removed to improve log clarity.