1. Zipf's law. https://en.wikipedia.org/wiki/Zipf Zipf's law. https://en.wikipedia.org/wiki/Zipf
2. Memcached:A distributed memory object caching system. http://memcached.org/ 2011. Memcached:A distributed memory object caching system. http://memcached.org/ 2011.
3. RAMCloud. http://ramcloud.stanford.edu 2013. RAMCloud. http://ramcloud.stanford.edu 2013.
4. Redis. http://www.redis.io/ 2013. Redis. http://www.redis.io/ 2013.
5. Workload analysis of a large-scale key-value store