Batch Coordinate cache #438
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Adds a cache for the Batch Coordinates. Cache entries are inserted by the broker after batches are committed to the Control Plane.
The cache is used by
DelayedFetchto check if it can complete or not. This spares multiple network calls to the Control Plane, replacing them with checks performed on the in-memory cache.On an high throughput use case, FindBatches queries performed by the brokers are reduced by 2/3, which causes Postgres CPU usage to drop by 50%.
