Tomasz Grabiec e40638823e db: Introduce mutation cache ...

row_cache class is meant to cache data for given table by wrapping
some underlying data source. It gives away a mutation_reader which
uses in-memory data if possible, or delegates to the underlying reader
and populates the cache on-the-fly.

Accesses to data in cache is tracked for eviction purposes by a
separate entity, the cache_tracker. There is one such tracker for the
whole shard.

2015-06-23 13:49:24 +02:00

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