Term Kind Topic What it is
Rebalance Cost Partition Reassignment Duration, State Restore Time concept Stateful Stream Processing The time a stateful consumer group is unavailable while partitions are reassigned and state restored - proportional to state size, incurred on every deployment, and invisible in throughput and lag metrics.
Stateful Stream Processing concept Stateful Stream Processing Stream computations that must remember information across events — aggregations, joins, deduplication, sessionisation — and the durability machinery that makes them recoverable.