DevGeist

Kubernetes Through Control Theory Glasses — Part 1: HPA

Kubernetes Through Control Theory Glasses — Part 1: HPA

A walk through control theory and the math hiding in the HPA reconcile loop.

May 13, 202618 min read

Ordered Retries in Kafka: Why You Probably Shouldn't Build This

Ordered Retries in Kafka: Why You Probably Shouldn't Build This

The Engineering Hangover

Mar 24, 20268 min read

Ordered Retries in Kafka: The Bugs You'll Find in Production

Ordered Retries in Kafka: The Bugs You'll Find in Production

The edge cases that break in production

Mar 17, 202612 min read

Ordered Retries in Kafka: Why The Retry Topic Is Breaking Downstream

Ordered Retries in Kafka: Why The Retry Topic Is Breaking Downstream

The Problem with Non-Blocking Retries

Mar 10, 20268 min read

The Ghost in the Database: Why Is This Empty Table Taking 20 Seconds to Query?

The Ghost in the Database: Why Is This Empty Table Taking 20 Seconds to Query?

A dive into InnoDB's history list and purge threads

Feb 3, 20267 min read

When ctx.Done() Isn't Enough

When ctx.Done() Isn't Enough

What Happens Between SIGTERM and Exit (And How to Handle It Right)

Jan 13, 202610 min read

Kafka Consumer Health Checks: Dead or Alive?

Kafka Consumer Health Checks: Dead or Alive?

Why consumer lag lies — and how to detect stuck Kafka consumers in Go

Dec 14, 202512 min read

API testing through simulations

API testing through simulations

Record once, replay forever — testing real APIs without the flakiness

Feb 23, 20258 min read