10⁹ Operations: Large Histories with Jepsen

I’m in the process of replacing a old radiator system with a centrally-ducted, air-source heat pump system with electric resistive backup heat. I’ve found that the default ecobee algorithm seems to behave surprisingly poorly for this system, and wanted to write up some of the settings that I’ve found yield better behavior. A disclaimer. I’m not...

Recently I’ve had users of my libraries start reporting mysterious errors due to a missing reference to SequencedCollection, a Java interface added in JDK 21: Execution error (ClassNotFoundException) at jdk.internal.loader.BuiltinClassLoader/loadClass (BuiltinClassLoader.java:641). java.util.SequencedCollection Specifically, projects using Jepsen...

This story is not practical advice. For me, it’s closing the book on an almost two-year saga. For you, I hope it’s an enjoyable bit of bureaucratic schadenfreude. For Anthem, I hope it’s the subject of a series of painful but transformative meetings. This is not an isolated event. I’ve had dozens of struggles with Anthem customer support, and...

People keep asking why Jepsen is written in Clojure, so I figure it’s worth having a referencable answer. I’ve programmed in something like twenty languages. Why choose a Weird Lisp? Jepsen is built for testing concurrent systems–mostly databases. Because it tests concurrent systems, the language itself needs good support for concurrency....

One of the things we struggle with on woof.group is un-actionable reports. For various reasons, most of the reports we handle are for posts that are either appropriately content-warned or don’t require a content warning under our content policy–things like faces, butts, and shirtlessness. We can choose to ignore reports from a domain, but we’d...