NewWatcher instantiates a Watcher.

Start calls Run on the Watcher as an async task with exponential backoff.

CompleteUpdate indicates that the events represent the entirety of data in the spans.

IncrementalUpdate indicates that the events represent an incremental update since the previous update.

TestingKnobs allows tests to inject behavior into the Watcher.

Update corresponds to a set of events derived from the underlying RangeFeed.

Watcher is used to implement a consistent cache over spans of KV data on top of a RangeFeed.

OnUpdateFunc is used by the client to receive an Update, which is a batch of events which represent either a CompleteUpdate or an IncrementalUpdate.

TranslateEventFunc is used by the client to translate a low-level event into an event for buffering.

UpdateType is passed to an OnUpdateFunc to indicate whether the set of events represents a complete update or an incremental update.