KIP-116 — Add State Store Checkpoint Interval Configuration

Discarded Streams

Proposed making the Kafka Streams state store checkpoint file write interval configurable via a new `state.store.checkpoint.interval.ms` config, so checkpoints are written periodically rather than only on clean shutdown. After an unclean shutdown, the checkpoint is lost and restoration begins from the earliest offset, causing unnecessarily long recovery times. (Rejected — checkpoint is written on every `commit`.)

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