Tag
5 posts
ETag is a cache validator on reads and a concurrency guard on writes — the specification requires different comparison rules for each. Built end to end in PHP and Go, and proven with two real writers racing for one resource.
Dapr's building blocks are portable; the guarantees underneath them are not. The same requests against two stores Dapr calls Stable — one failure is refused, the other is silent. With a runnable demo.
Seven published incidents, two predating LLMs, collapse into four shapes: the label became the goal, the gate never held, validation stayed inside, and the recovery was never tested.
When your consumer crashes after processing but before acknowledging, the broker redelivers — and your system processes the same message twice. The Inbox pattern is the answer to safe, idempotent message consumption.
When your database transaction commits but the message never reaches the queue, the Outbox pattern is the answer. A practical guide to reliable event publishing without dual-writes.