Daily Scrum

회고 (Retrospective)

Locking - Optimistic concurrency control (OCC)

Background it's on a short-lived transaction and can have multiple operations. So the event is designed as an append-only event logging table. Since records can’t be modified. Managing Transaction SQL Guide : https://support.unicomsi.com/manuals/soliddb/100/index.html#page/SQL_Guide/5_ManagingTransactions.06.1.html%231126545 : https://support.unicomsi.com/manuals/soliddb/100/SQL_Guide/5_Managing..

CNCF Projects - TBR

https://www.cncf.io/projects/ Graduated and Incubating Projects | Cloud Native Computing Foundation Graduated and incubating projects are considered stable and used successfully in production. View on CNCF landscape View on CNCF landscape CNCF projects have a maturity level of sandbox, incubating… www.cncf.io

Blue green deployment - TBR

https://jason-lim.tistory.com/3

Rest? gRPC? GraphQL?

Use REST if: You’re building a CRUD-style web application. Your API is mostly manipulating well-structured related data. Your API needs to be highly cacheable, including support for intermediate proxy caching. Use gRPC if: Your API is private and powers communications between parts of a microservices architecture. Your API is mostly about actions. You need to collect data from IoT devices. You’r..

Jenkins, GitHub Actions

Jenkins, CircleCI 여러 가지 CI 솔루션이 있다는 건 알았지만 내가 처음 사용해본 건 GitHub Actions 였다. 왜 대규모 회사에서는 Jenkins 많이 사용할까에 궁금증이 있었는데 이번에 느낀점은 Jenkins + Pipeline을 이제까지 잘 사용해왔다. 한눈에 보기 좋다 거의 이런 이유였다. 최근 Ops팀이 K8S ArgoCD로 배포환경을 변경하며 GitHub Actions Workflow으로 변경하고 각 서비스 팀들도 필요한 자동화 프로세스를 넣다보니 비용이 많이 나와 Self-Hosted Runner를 생성하고 소개해주셨었는데 이런것도 있구나 싶었다.

Lambda cold start

The underlying technology of Lambda is a container. Therefore, if Lambda is used, even if it is set to the lowest specification, the container will quickly float and scale-out at the moment of load, and it is expected that it will be able to receive all the loads. Conceptually, that’s correct. But in practice, there are many cases where this is not the case. Otherwise, the container is not creat..

Mono Repo vs Multi Repo

Cons and Pros Mono-repo makes it easier for engineers to understand the big picture of their project. Mono-repo fosters collaboration among engineers. Mono-repo simplifies dependency management. In a large codebase, performance problems creep in mono-repo. Multi-repo allows you to separate teams’ areas of responsibility. Since each service resides in its repository, multi-repo often helps you av..

Environment Variable Management

Background Check The Twelve-Factor App 's Config chapter. There are many advantages to using environment variables to store app configurations. Problem Env files are easily fragmented. Copied from somewhere to anywhere without context. Branched. Hard to merge. Let’s imagine that there are how many copies of env files. We have three env templates in the repository of tokotalk-api. They can be bra..