There are only two hard things in Computer Science: cache invalidation and naming things. -- Phil Karlton

Long a favorite saying of mine, one for which I couldn't find a satisfactory URL.

Like many good phrases, it's had a host of riffs on it. A couple of them I feel are worth adding to the page

Leon Bambrick @secretGeek
·
There are 2 hard problems in computer science: cache invalidation, naming things, and off-by-1 errors.
9:20 AM · Jan 1, 2010

Mathias Verraes @mathiasverraes
·
There are only two hard problems in distributed systems: 2. Exactly-once delivery 1. Guaranteed order of messages 2. Exactly-once delivery
2:40 PM · Aug 14, 2015