Since writing this post, we have built Ristretto: A High Performance Go cache. Read all about it here.
This post made it to the top of Golang subreddit and is trending #2 on the front page of Hacker News.
We have built an efficient and persistent log structured merge (LSM) tree based key-value store, purely in Go language. It is based upon WiscKey paper included in USENIX FAST 2016.