This book is for people who want to know what consensus algorithms are really deciding, if not a group agreement.
When a node goes quiet and you can't tell whether it crashed or is just slow, which history do you keep?
Chapter 1 starts with that fact: you can't tell a stopped node from a slow one.
If you'd rather learn the groundwork no algorithm gets to skip than memorize one more algorithm name, start right here with Chapter 1.
Free sample of *Consensus Underground: The Failure Models Behind Raft, PBFT, and Proof-of-Stake*: the front matter and Chapter 1, "You Can't Tell a Stopped Node from a Slow One", as PDF and EPUB. The full book is here:
https://buymeacoffee.com/asopitechia/e/577385