The first thing I have to say about adding nodes is to not do it. Salvatore Sanfilippo wrote a great post about sharding Redis, and his recommendation is that re-hashing is difficult and instead you should create a large number of small Redis instances up front, that way you don’t have to add more nodes down the road.
This blog is called myNoSQL and it is written by me, Alex Popescu, a software architect with a passion for open source and communities.
It records my readings, learnings, and opinions on NoSQL databases, polyglot persistence, and distributed systems -- subjects that I'm passionate about.
The opinions expressed here are my own, and no other party necessarily agrees with them.
If you feel I'm biased, I probably am.