Juca

Distributed Services with Go: Index - Write Sync in index (Page 35)

PDF - Page 35

No need to synchronize this function? How mmap work with multiple writers?.

func (i *index) Write(off uint32, pos uint64) error {
if uint64(len(i.mmap)) < i.size+entWidth {
return io.EOF
}
enc.PutUint32(i.mmap[i.size:i.size+offWidth], off)
enc.PutUint64(i.mmap[i.size+offWidth:i.size+entWidth], pos)
i.size += uint64(entWidth)
return nil
}

Same question for function
func (s *segment) Append(record *api.Record) (offset uint64, err error)

Thank you,

JC.

View thread on forum

#question /book-distributed-services-with-go

1 569 0

2022-04-18 12:39:45 UTC

Where Next?

View thread on forum

View Distributed Services With Go's book portal

Post errata for this book

Post a suggestion for this book

Post a question about this book

Post a review about this book

question

Home PragProg Customers

#question /book-distributed-services-with-go

1 569 0

Last post

Popular Pragmatic Bookshelf topics

PragProg Customers

Distributed Services With Go - Ch 3 index errors on Config

In Chapter 3, the source for index introduces Config on page 31, followed by more code including tests; Config isn’t introduced until pag...

#pragprog #errata /book-distributed-services-with-go

8 1316 3

2021-04-08 12:48:40 UTC

New

PragProg Customers

Hands-on Rust: question about get_component

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...

#question /book-hands-on-rust

1 1167 5

2021-02-01 15:17:34 UTC

New

PragProg Customers

Distributed Services with Go: Chapter 3 suggestions

Page 28: It implements io.ReaderAt on the store type. Sorry if it’s a dumb question but was the io.ReaderAt supposed to be io.ReadAt? ...

#errata /book-distributed-services-with-go

0 1302 3

2022-07-27 14:35:18 UTC

New

PragProg Customers

Programming Phoenix LiveView: errata and remarks Version B2.0

The generated iex result below should list products instead of product for the metadata. (page 67) iex> product = %Product{} %Pento....

#errata /book-programming-phoenix-liveview

0 1800 20

2021-03-23 10:33:03 UTC

New

PragProg Customers

Programming Phoenix LiveView: B03 (page 56-57) auth exercise

Dear Sophie. I tried to do the “Authorization” exercise and have two questions: When trying to plug in an email-service, I found the ...

#question /book-programming-phoenix-liveview

1 1181 3

2021-05-04 15:14:02 UTC

New

PragProg Customers

Modern Front-End Development for Rails: ERROR in tsconfig.json Chapter_01/01

@noelrappin Running the webpack dev server, I receive the following warning: ERROR in tsconfig.json TS18003: No inputs were found in c...

/book-modern-front-end-development-for-rails

3 1438 3

2021-09-02 19:11:59 UTC

New

PragProg Customers

Python Testing with pytest, Second Edition: error when installing editable package (page 178)

When installing Cards as an editable package, I get the following error: ERROR: File “setup.py” not found. Directory cannot be installe...

#errata /book-python-testing-with-pytest-second-edition

0 1739 1

2021-12-10 05:12:55 UTC

New

PragProg Customers

Agile Web Development with Rails 7: Reloading assets in development mode

Hi all, currently I wonder how the Tailwind colours work (or don’t work). For example, in app/views/layouts/application.html.erb I have...

#question /book-agile-web-development-with-rails-7

2 1380 4

2022-02-18 10:00:49 UTC

New

PragProg Customers

Agile Web Development with Rails 7: (page 70)

Title: Agile Web Development with Rails 7: (page 70) I am running windows 11 pro with rails 7.0.3 and ruby 3.1.2p20 (2022-04-12 revision...

#question /book-agile-web-development-with-rails-7

0 1129 1

2022-06-08 13:17:16 UTC

New

PragProg Customers

Programming Machine Learning: some plot files are throwing error

I got this error when executing the plot files on macOS Ventura 13.0.1 with Python 3.10.8 and matplotlib 3.6.1: programming_ML/code/03_...

#question /book-programming-machine-learning

1 3055 5

2023-09-17 09:42:29 UTC

New

Other popular topics

General Dev>Dev Chat

HELLO WORLD (Introductions thread!)

Hello Devtalk World! Please let us know a little about who you are and where you’re from :nerd_face:

#community

484 8259 119

2026-08-03 23:40:02 UTC

New

General Dev>Hardware

Keyboard thock (sound)

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...

/keyboards #mechanical-keyboards

14 11197 8

2020-11-11 11:59:23 UTC

New

General Dev>Hardware

BIIP MT3 Extended 2048 Custom Keycap Set (Drop)

This looks like a stunning keycap set :orange_heart: A LEGENDARY KEYBOARD LIVES ON When you bought an Apple Macintosh computer in the e...

/keyboards #apple #keycaps #mechanical-keyboards

14 6713 7

2020-12-12 19:58:26 UTC

New

macOS>Chat

My thoughts on macOS vs Linux

Small essay with thoughts on macOS vs. Linux: I know @Exadra37 is just waiting around the corner to scream at me “I TOLD YOU SO!!!” but I...

#macos #linux

166 9730 69

2021-04-10 22:36:29 UTC

New

Backend>Chat

Data Structures and Algorithms with Elixir

This is going to be a long an frequently posted thread. While talking to a friend of mine who has taken data structure and algorithm cou...

/elixir #algorithms #data-structures

108 11869 31

2024-11-14 02:14:00 UTC

New

Game Dev>Questions

Can I use Java to program a game for Nintendo switch?

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...

/java #nintendo

8 4771 3

2023-09-15 11:15:04 UTC

New

Backend>Learning Resources

Programming Ruby 3.2 (5th Edition)

Programming Ruby is the most complete book on Ruby, covering both the language itself and the standard library as well as commonly used t...

twitter.com

#pragprog /ruby /rails #published-book /book-programming-ruby-3-2-5th-edition

28 8550 13

2024-11-17 04:34:14 UTC

New

Backend>Learning Resources

Machine Learning in Elixir

Leverage Elixir and the Nx ecosystem to build intelligent applications that solve real-world problems in computer vision, natural languag...

pragprog.com

#pragprog /elixir #published-book #machine-learning #nx /book-machine-learning-in-elixir

18 4615 7

2024-11-08 22:13:04 UTC

New

AI>Chat

Post your DeepSeek results

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...

/deepseek

15 4275 15

2025-03-06 23:29:12 UTC

New

AI>Learning Resources

A Common-Sense Guide to AI Engineering

Build robust LLM-powered apps, chatbots, and agents while mastering AI engineering principles that will help you outlast the tools and th...

pragprog.com

#pragprog

17 1852 8

2025-10-31 17:38:39 UTC

New

Distributed Services with Go: Index - Write Sync in index (Page 35)

Juca

Distributed Services with Go: Index - Write Sync in index (Page 35)

Where Next?

Popular Pragmatic Bookshelf topics

Distributed Services With Go - Ch 3 index errors on Config

Hands-on Rust: question about get_component

Distributed Services with Go: Chapter 3 suggestions

Programming Phoenix LiveView: errata and remarks Version B2.0

Programming Phoenix LiveView: B03 (page 56-57) auth exercise

Modern Front-End Development for Rails: ERROR in tsconfig.json Chapter_01/01

Python Testing with pytest, Second Edition: error when installing editable package (page 178)

Agile Web Development with Rails 7: Reloading assets in development mode

Agile Web Development with Rails 7: (page 70)

Programming Machine Learning: some plot files are throwing error