system-design – Page 7 – Türker Yıldırım

Eight failure modes covering forty-one incidents

NoteJanuary 30, 20242 min read

Three years of incident notes, read as an inventory rather than as history. Eight documents cover eighty-seven per cent of what has ever gone wrong, which is a…

Reproducing a build from six months ago

Deep diveJanuary 4, 202414 min read

A security question about a release from July, and no way to rebuild it. The same commit produces a different image, and neither of them is wrong.

A decision record that recorded a reversal

NoteJanuary 3, 20242 min read

A record superseding one from 2021, written by the same person, saying the opposite. The section naming what the superseded record got right is the one that makes…

The interface with one implementation, and when that is fine

Deep diveNovember 16, 202310 min read

140 interfaces, 128 of them with exactly one implementation, and a jump-to-definition that always lands on the wrong file.

The bundle we split by route, and the waterfall it created

Deep diveOctober 24, 202310 min read

A 900 KB bundle, split by route, and a page that got slower. Six sequential requests before the first render.

The decision record that stopped an argument happening twice

NoteOctober 24, 20232 min read

The same discussion about queue technology, for the third time in two years, with two of the three people having been present for the first. The consequences section…

The alert that fired for two years and meant nothing

Deep diveOctober 18, 202310 min read

Thirty-one alert rules, a channel muted by everybody, and 412 alerts in a month of which four corresponded to a real problem.

Import blocks, and the resources we had been pretending to manage

Deep diveSeptember 21, 202310 min read

Terraform 1.5 in June, and an import that is part of the plan rather than a side effect. Fourteen resources created by hand in 2019.

An outbox, and the publisher we removed from the transaction

Deep diveSeptember 20, 202310 min read

An order committed and an event never published, twice in one week. A broker call inside a database transaction, and a rollback after it.

Moving a fifteen-year-old site into the site editor

Deep diveAugust 21, 202315 min read

A theme first written in 2008, 61 template files, and an editor who cannot change a footer without a deploy.