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There is a separate DB per core, each serving a subset of the key space. From the outside in appears to behave as one DB. item_key type was changed to include the hash so that we calculate the hash only once. The same hash is used for sharding and hashing. No need for store_hash<> option on unordered_set<> any more. Some seastar-specific and hashtable-specific stats were moved from the general "stats" command into "stats hash", which shows per-core statistics.