So cool! Redis is one of my favorite pieces of software and it's super interesting to see some of the internals explained more clearly. At the moment I'm only on the second episode, but I look forward to the rest of them. Perhaps replication could be a topic as well, if it's not already covered in the Sentinel and/or Cluster episodes. Another thing that would be interesting is how connections are handled and how concurrent commands from separate clients get executed in a sane way.

As an aside, I noticed several typos sneaked into comments here and there ('command gets replicated to the salves', etc). I'm half considering filing a pull request for them, but feel it might come across as overly pedantic. Would such a PR be appreciated?