Shameless plug: I'm working on RediSearch, an open-source, in-memory Redis module written in C that does search. Not nearly full-featured as Lucene and friends,

Shameless plug: I'm working on RediSearch, an open-source, in-memory Redis module written in C that does search. Not nearly full-featured as Lucene and friends, of course, but it's a very young project. http://redisearch.io http://redisearch.io