This is going to sound snobby to some people but I don't care. I really believe this.

The whole book is written in Markdown. This is a huge red flag for me and the book goes in to the "no" pile pretty much immediately.

Distributed computation is a complex and complicated discipline. Moreover if you're going to write a book and you don't even realize that Markdown is completely inappropriate it calls in to question your authoring skills.

At best the use of Markdown is lazy.

If you are an expert in distributed computation I assume that you're probably capable of using LaTeX, DocBook, *roff, or some other appropriate technical authoring system.