kumofs

Kumofs is a simple and fast distributed key-value store which can use a memcached client library to get, set, delete, or compare-and-swap values. Tokyo Cabinet serves as a high-performance back-end. Main features of kumofs: * data is partitioned and replicated over multiple servers; * performance on single node systems is comparable with memcached; * read and write performance improve when servers are added; * servers can be added, restarted, or removed on the fly with no configuration change; * automatic rebalancing is supported via a consistency control algorithm; * it provides a safe Compare-And-Swap operation; * the memcached protocol is supported. Kumofs is used at Nico-Nico Douga, the most popular video sharing service in Japan.