KIP-1366 — Configurable Segment Interval for Window and Session Stores

Discussion Streams

Exposes `segmentInterval` as an optional parameter on the `Stores` factory methods for window and session stores, following the pattern KIP-889 established for versioned key-value stores. The interval is currently derived as `max(retentionPeriod / 2, 60_000ms)`, so any retention change shifts segment boundaries and forces a full changelog restore, and long retentions produce oversized active segments that hurt RocksDB compaction and cache-hit ratios.

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