architecture – Page 44 – Türker Yıldırım

nginx grpc_pass exists now, and mostly you do not need it

NoteJune 3, 20192 min read

nginx has proxied gRPC since 1.13.10, and the interesting question in a PHP shop is whether gRPC is the right thing to be proxying at all. The HTTP/2…

Rate limiting per client, and the header that says so

NoteMay 29, 20192 min read

A limit with no feedback means a well-behaved client cannot behave well — it finds out by being refused, and its only strategy is to retry. Retry-After is…

Symfony 4.3 shipped an HTTP client worth using

Deep diveMay 14, 201910 min read

The framework had no client of its own and now it has one with a reason to exist: responses that are lazy by default, and concurrency without a…

Site health, and the plugin that was quietly failing

Deep diveMay 9, 201910 min read

5.2 added a screen that tells you what is wrong, which is new for WordPress. What the checks actually test, and the recovery email nobody receives.

A cache that survives the thing it is caching

Deep diveMay 8, 201914 min read

The cache expired at noon and the database fell over at 12:00:01. A lock, a two-tier expiry, jittered TTLs, and versioned keys — in that order of importance.

Elasticsearch 7 removed mapping types

Deep diveApril 30, 201910 min read

One type per index in 6, none at all in 7, and every query URL changes. The reindex cannot be done in place — and the default shard…

What is additive, and what a shipped client cannot survive

NoteApril 18, 20192 min read

The cheapest API version is the one never created, and that stays achievable for far longer than most teams expect provided every change is additive. The two list…

Timeouts are a concurrency limit only if you also cap concurrency

NoteApril 16, 20191 min read

Setting a thirty-second timeout on an HTTP call feels responsible and is not a limit on anything that matters when the upstream is merely slow rather than down.…

Product lookup tables, and reading a shop without postmeta

Deep diveApril 10, 201910 min read

3.6 added lookup tables, which is WooCommerce admitting postmeta does not scale. What they contain, what they do not, and the regeneration nobody schedules.

A circuit breaker needs shared state and a fail-open default

NoteApril 2, 20192 min read

Counting failures in a PHP object means each of fifty workers keeps its own count and opens independently, which is fifty times more slow calls than intended. Using…