KIP-319 — Replace segments with segmentInterval in WindowBytesStoreSupplier

Accepted Kafka 2.1 Streams

Replaces the segments() method on WindowBytesStoreSupplier with a segmentInterval() method returning the duration of each segment in milliseconds rather than the segment count. The store cache uses segment interval (not count) to size itself correctly; returning segment count required callers to do the division themselves and made the interface semantically incorrect.

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