Blog - LINE ENGINEERING

As of October 1, 2023, LINE has been rebranded as LY Corporation. Visit the new blog of LY Corporation here: LY Corporation Tech Blog

API documentation with comments parsing
jeongeun-jeon2020-07-22
As a technical writer, I get excited every time I start a new project. At the starting point, it gives me freedom as it is wide open with possibilities. Such a freedom motivates me to explore new domains. From that perspective, I find technical documentation consulting exciting as it gives me an opportunity to try new things and learn from them. I'd like to share in this post what I've learned from API documentation consulting I provided a few months ago. More specifically, it is
- Technical Writing
Improving Build Performance of LINE for iOS with Bazel
Doan TruongThi2020-07-09
iOS Engineer at LINE.
Background Over the years, the LINE for iOS source tree has grown to a size of hundreds of modules. As of late 2019, the project consists of more than 1.4 million lines of code without showing any signs of stopping its increase. This in turn, tripped up the build times for all the developers who work on the project. As the project grew we started to see more unreproducible problems as well. For instance, the builds worked locally but not on CI and vice versa. We took a step back
Using Circuit Breakers with Armeria
Seunghwan Joo2020-07-08
Seunghwan is in charge of LINE OpenChat back-end development
What is a circuit breaker? Suppose an unexpected failure occurs (For example, a network issue or a server crash) and a remote server is unable to respond to the request. If so, the client who made the request to the remote server will either wait for a response until a timeout occurs, consume resources, or eventually continue to send unnecessary requests. And on a Microservice Architecture (MSA), this client can also be a server for other services. In the end, clients of this server will have
- Server-side
- Armeria
- Java
Let's Play with Reactive Streams on Armeria – Part 2
Ikhun Um2020-07-03
Ikhun is developing for open-source Armeria and Central Dogma at LINE Plus.
In the first part of this blog post, we took a look at the basic concepts of Reactive Streams. In part 2 of this blog post, I'd like to tell you about how we use Reactive Streams with Armeria. What’s Armeria? Armeria is an open-source asynchronous HTTP/2, RPC, REST client/server library based on Java 8, Netty, Thrift, and gRPC. While Armeria is a lightweight microservices framework, its capabilities is comparable to existing full stack web frameworks. Let's first take a look at so
LINE Securities: Page Stack revisited
sunderls2020-06-15
sunderls is a front-end engineer
2 years ago I posted an article about why and how we achieved Smooth page transition with Page Stack. We adopted this approach for LINE Securities, and pushed it a little further. In this article, I am going to show you what we have done to improve it, and also what problems we are currently facing. Header parallax transition In case you haven't read my previous post, allow me to do a brief recap on what Page Stack is. Page Stack is basically an approach that mimics nativ
【Team & Project】Meet the Team Developing the Verda Platform Using OpenStack and Kubernetes
LINE Engineering2020-06-03
LINE Engineering Blog official account
「Team & Project」 takes a look at different departments within LINE's development organization and introduces their roles and team structure, tech stacks, challenges that lie ahead, roadmaps, and more. In this edition, we sat down to chat with members of the Verda Platform Development Team. Part of the Verda Department which in turn is under the IT Service Center (supervises all infrastructure), the team works on development for the Verda Platform.Verda Platform Development Team at the zoom m
Who murdered my lovely Prometheus container in Kubernetes cluster?
littledriver2020-06-01
The most courageous infrastructure engineer on the Verda Team. Active contributor in open source projects.
This blog post is about an interesting experience I had while investigating and resolving a problem that happened in the Prometheus container which was still in the CrashLoopBackoff state. The phenomenon itself and the solution are obvious and simple; so simple that you may feel that it is not worth it to spend time on this issue. However, I think there must be a lot of people like me who want to understand the details of each step in the investigation process. After reading this post, you wil
High-throughput distributed rate limiter
Viacheslav Kapilevich2020-05-14
Viacheslav is a server-side engineer at LINE.
Production-grade systems usually consist of multiple interconnected components that depend on each other. Popularization of the microservice architectures in recent years has led to an increase in the number of components and their interconnectivity. To protect each component from overloading and guarantee overall system quality of service, rate limiters can be used.Many articles and tutorials discuss server-side rate limiters for a service running on a single host. In this article, I will mainl
Keeping up with ever-changing web development trends
Cipto Hartanto2020-05-13
Cipto is a web developer at LINE Taiwan
Web Directions, a conference founded by John Allsopp and Maxine Sherrin in 2004, covers all facades of web and digital professionals such as web design, front-end and back-end development, information architecture, interaction design, product design, accessibility, product management, and other interesting topics. Most of the conferences have been held in Australia with the Web Directions Summit being held in Sydney, while the Code, Design, and Product conferences are held in Melbourne.John and
A new challenge for LINE Timeline - 1
Kyoungbok Lee2020-05-13
I am a senior developer working on our Social Platform
Foreword A feature called "Discover" (known as "Explorer" in regions outside of Japan) and a new subscription model called "Follow" have been added to the LINE Timeline service. Although users are familiar with these features, we ended up writing this post because we wanted to share the parts that we had considered and made efforts on within these features. Starting with this introduction, we have planned a three-part series to bring you more detailed information. LINE Timeline's New Ch
- Server-side
- Data/AI