architecture – Page 18 – Türker Yıldırım

Partitioning by month, and the query that scanned all of them

Deep diveJune 27, 202310 min read

A 400 million row events table and a delete that could not finish. Dropping a partition takes two seconds; getting there takes a schema change.

Layer rules that finally matched the folders

NoteJune 8, 20232 min read

A layered architecture documented in a diagram from 2019 and enforced by nothing, with 88 violations by the time anybody checked. The baseline is what makes this adoptable:…

Two years of deprecations, and the upgrade we could no longer defer

Deep diveJune 6, 202314 min read

PHP 8.0 reaches end of life in November and the application is on it. 4,100 deprecation notices, and a log filter that had been hiding them.

A suite that runs in four minutes because it stopped touching the database

Deep diveMay 28, 202310 min read

1,400 tests, fourteen minutes, and 1,100 of them opening a transaction against MySQL for no reason anybody could name.

Versioning by adding a field and never removing one

NoteMay 24, 20232 min read

Four years of an API with no version number in the path, because the rule was that nothing incompatible ships. The discipline is cheaper than versioning and it…

Rebuilding the deploy as something a stranger could run

Deep diveMay 16, 202314 min read

A deploy that one person can run, and a holiday booked for August. A runbook of 22 steps, four of which say “check it looks right”.

The anti-corruption layer we should have written first

Deep diveMay 9, 202310 min read

A supplier who renamed four fields in a minor release, without notice, and twenty-two files touched to accommodate it.

One collection in MongoDB, and the reasons that did not hold

NoteApril 13, 20232 min read

A document store added for one collection of variable-shaped supplier payloads, in an application whose other forty tables are relational. The migration back was two days and the…

A container we replaced with four functions

Deep diveApril 12, 20238 min read

A package with a dependency injection container, for eleven services, spending 90 ms compiling on a request that does 12 ms of work.

A console command that is a thin wrapper over a service

NoteMarch 30, 20232 min read

A command with 80 lines in execute(), none of which could be called from anywhere else, including a test. The command should parse input, call one thing, and…