KIP-704 — Send a hint to the partition leader to recover the partition

Accepted Kafka 3.2 Broker

Adds a new `AlterPartitionReassignments`-style hint mechanism allowing the controller to notify a partition leader elected via unclean leader election that it should fetch committed records from surviving replicas before serving reads. Unclean leader election can cause data loss and state inconsistency with transaction/group coordinators because the new leader may delete records committed by previous leaders; this hint allows recovery without user intervention.

Protocol Impact

AlterPartition v1 · LeaderAndIsr

Details