KIP-1268 — Prevent Dynamic Partition Expansion of Internal Topics

Discussion Broker

Prevents partition count expansion for internal Kafka topics (__transaction_state, __consumer_offsets, __share_group_state) by blocking AdminClient alter-partition-count operations on them. These topics use hash-based routing of transaction IDs or group IDs to specific partitions; changing partition count breaks the routing invariant and causes coordinators to lose track of existing state, leading to data loss or correctness failures.

Protocol Impact

CreatePartitions

Details