erni27

erni27

Distributed Services with Go: Harmfully hiding Raft protocol details (Chapter 9)

@travisjeffery

The book in many places stands for Raft consensus algorithm being able to replicate all data across the servers. The truth is that data is EVENTUALLY consistent across the servers and Raft itself is based on assumption that all requests are handled by the leader - not the followers. This also includes read operations.

A client can observe inconsistent state across multiple calls with an introduced approach (load-balancing across the followers). For replication Raft uses a majority rule so it returns to the client after the log entry is replicated on a majority of the servers. But REPLICATED indeed doesn’t mean APPLIED (so applied to the state machine). Moreover, the majority of the servers doesn’t mean all the servers. The followers should be considered as inconsistent. Only the leader guarantees consistency. And it questions the correctness of the built distributed system.

Chapter 9 is extremely useful and it does its job - so perfectly describes the concept behind gRPC client-side load-balancing. But I think it would be great if the book explicitly explained the drawbacks of chosen approach and highlight the fact that what has been done for educational purposes is not entirely true and production ready.

Where Next?

Popular Pragmatic Bookshelf topics Top

mikecargal
Title: Hands-on Rust: question about get_component (page 295) (feel free to respond. “You dug you’re own hole… good luck”) I have somet...
New
New
AndyDavis3416
@noelrappin Running the webpack dev server, I receive the following warning: ERROR in tsconfig.json TS18003: No inputs were found in c...
New
fynn
This is as much a suggestion as a question, as a note for others. Locally the SGP30 wasn’t available, so I ordered a SGP40. On page 53, ...
New
hazardco
On page 78 the following code appears: <%= link_to ‘Destroy’, product, class: ‘hover:underline’, method: :delete, data: { confirm...
New
akraut
The markup used to display the uploaded image results in a Phoenix.LiveView.HTMLTokenizer.ParseError error. lib/pento_web/live/product_l...
New
mert
AWDWR 7, page 152, page 153: Hello everyone, I’m a little bit lost on the hotwire part. I didn’t fully understand it. On page 152 @rub...
New
andreheijstek
After running /bin/setup, the first error was: The foreman' command exists in these Ruby versions: That was easy to fix: gem install fore...
New
dachristenson
I just bought this book to learn about Android development, and I’m already running into a major issue in Ch. 1, p. 20: “Update activity...
New
dachristenson
@mfazio23 Android Studio will not accept anything I do when trying to use the Transformations class, as described on pp. 140-141. Googl...
New

Other popular topics Top

wolf4earth
@AstonJ prompted me to open this topic after I mentioned in the lockdown thread how I started to do a lot more for my fitness. https://f...
New
AstonJ
Or looking forward to? :nerd_face:
New
PragmaticBookshelf
Design and develop sophisticated 2D games that are as much fun to make as they are to play. From particle effects and pathfinding to soci...
New
AstonJ
I’ve been hearing quite a lot of comments relating to the sound of a keyboard, with one of the most desirable of these called ‘thock’, he...
New
PragmaticBookshelf
Tailwind CSS is an exciting new CSS framework that allows you to design your site by composing simple utility classes to create complex e...
New
AstonJ
If you are experiencing Rails console using 100% CPU on your dev machine, then updating your development and test gems might fix the issu...
New
Help
I am trying to crate a game for the Nintendo switch, I wanted to use Java as I am comfortable with that programming language. Can you use...
New
New
husaindevelop
Inside our android webview app, we are trying to paste the copied content from another app eg (notes) using navigator.clipboard.readtext ...
New
AstonJ
Curious what kind of results others are getting, I think actually prefer the 7B model to the 32B model, not only is it faster but the qua...
New

Sub Categories: