StorageLevel

Data persisted to disk only. Has to be fetched on every value request.

Data small enough to be encapsulated by reference object. Used by storage implementations as an optimization.

Data cached in-memory as materialized object. Faster access but mutation-sensitive.

Data persisted to disk and cached in-memory as materialized object.

Data persisted to disk and cached in-memory as pickled byte array.

Data cached in-memory as pickled byte array. Slower access but dense representation.

Data is managed by a resource independent of the caching implementation. For instance, it could be a Vagabond data dependency.