net-proxy/nutcracker
A fast, light-weight proxy for Memcached and Redis. (Twitter's Twemproxy)
USE Flags
debug
Global: Enable extra debug codepaths, like asserts and extra output. If you want to get meaningful backtraces see http://www.gentoo.org/proj/en/qa/backtraces.xml
doc
Global: Adds extra documentation (API, Javadoc, etc)