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

Abuser detection random forest model and hyperparameter tuning
Dekai Wah2020-11-11
Dekai is an intern on the Game Security Department
Hello everyone, I'm Dekai Wah, currently an intern at LINE's Game Security Department. In our department, we work on different facets of securing games from cheating behavior. These could range from obfuscating code to analysis of suspicious behavior on our game servers. In this project, my teammate Yoshiki Kusama and I analyzed the game data retrieved from our game servers and just as mentioned in an earlier article, find new ways to or better methods to detect game cheatin
LINE DEVELOPER DAY 2020 Speaker Interviews
Teppei Miki2020-10-30
Developer Relations Team, LINE Corporation.
I'm Miki from the Developer Success Team. LINE DEVELOPER DAY is a technical conference for engineers where we will introduce the challenges and initiatives in the technical field of LINE's various services. This year's conference will be held online for three days from November 25th to 27th. The official website for LINE DEVELOPER DAY 2020 The conference will offer over 150 sessions over 3 days, divided into specialized tracks for each technology area as follows Day1 : AI/Data, Server Side
- linedevday
Introduction of panel discussions with guest speakers in LINE DEVELOPER DAY 2020
Momoki Kota2020-10-29
Developer Success Team
Hi, this is Momoki from the Developer Success Team. During LINE DEVELOPER DAY 2020, scheduled to be held online November 25-27, 26 of the 156 sessions will be held in a multi-person panel discussion format with a theme. 「LINE DEVELOPER DAY 2020」Official Website： https://linedevday.linecorp.com/2020/en List of Sessions：https://linedevday.linecorp.com/2020/en/sessions In this article, you will find session summaries and speaker profiles for the 10 sessions that will be conducted in a panel dis
- linedevday
Introduction of guest speakers and their sessions in LINE DEVELOPER DAY 2020
Momoki Kota2020-10-21
Developer Success Team
Hi, this is Momoki from the Developer Success team. We are pleased to announce that we have updated the session list for LINE DEVELOPER DAY 2020, which will be held online for three days from November 25th to 27th. You can find the official website for LINE DEVELOPER DAY 2020 at: https://linedevday.linecorp.com/2020/en/ More than 200 people, mostly engineers from LINE and its affiliates, will be speaking at this year's LINE DEV DAY, with a total of 156 sessions planned.There will be 30 sessi
- linedevday
An intern's tale of designing LINE's firewall secretary
Valeri Haralanov2020-09-28
Valeri is an engineer on the Infra Protection 1 team
Greetings! Today I'm going to write about my experience as an intern working on LFMS - the LINE Firewall Management Service - and more specifically, how I designed a part of it called Service Risk Scoring. But first, let me quickly introduce myself. My name is Valeri Haralanov - in English-speaking contexts I go by the name of Val. I am currently a 3rd year student in the University of Saitama where I study Information Engineering, a.k.a. Computer Science, and I spend most of my time eith
【Team & Project】 Meet the team that is in charge of the LINE app's messaging server development, as well as development and operation of the Apache Kafka Platform
LINE Engineering2020-09-24
LINE Engineering Blog official account
The Team & Project series takes a look at different departments within the development organization at LINE Corp. ("LINE") and introduces their roles, team structure, tech stacks, challenges that lie ahead, roadmaps, and more. In this edition, we sat down to chat with the team that develops the LINE app's messaging server and develops and operates the Apache Kafka platform. Our guests today are Wonpill Seo, Masahiro Ide, Javier Luca de Tena and Yuto Kawamura of the Z Part Team.Z Part Team at
Adding experimental WebAssembly support to Decaton - Part 2
Kawamura Yuto2020-09-17
He is an engineer working at LINE. He is in charge of developing and managing LINE's core data pipeline and storage which are built on top of some OSS technologies such as Apache Kafka
In the 1st part of this article, we looked into how we can integrate WebAssembly runtime into a Java application. Then we faced a big limitation of current Wasm/WASI that it doesn't support sockets, making most of the practical Decaton processors difficult to be hosted on it due to disabled network I/O. In this 2nd part, we will attempt to extend WASI APIs and Rust's standard library to add support for sockets. The goal is to make the below Decaton Wasm processor working (the processor implemen
Adding experimental WebAssembly support to Decaton - Part 1
Kawamura Yuto2020-09-17
He is an engineer working at LINE. He is in charge of developing and managing LINE's core data pipeline and storage which are built on top of some OSS technologies such as Apache Kafka
WebAssembly is a binary instruction format for a stack-based virtual machine, which aims to be a compilation target of many programming languages to enable executing a program at any place like browsers, embedded devices, and servers with high portability, high performance, and sandboxing capability. Wasm recently caught my interest along with the Rust programming language, and I came up with an idea to integrate it with Decaton, a Kafka consumer framework that we develop and ma
On code readability - 1. Introduction and principles
Ishikawa Munetoshi2020-08-26
Developer Experience Development
Presentation overview Ever since starting development for LINE beginning in 2011, we have been continuously developing and improving features to provide a better user experience. The growth of the project resulted in an increase of 1.5 million lines of Android client code including modules, and the team expanded to more than 50 members. For such large-scale projects, it's important to maintain code readability and constantly address technical debts to achieve sustainable software development.
- CodeReadability
Monitoring applications with Prometheus and Metricat
Viacheslav Kapilevich2020-07-28
Viacheslav is a server-side engineer at LINE.
In this blog post, I would like to talk about the development of monitorable applications with Prometheus. I will also introduce one of the personal projects I work on in my free time which can help with the development of such applications - Metricat. Observability Observability has become one of the essential characteristics of modern software systems. There are three main observability concepts - monitoring, tracing, and logging. Monitoring allows developers to see various metrics of a sys