Tinker10:15, wait for the ttl: 201 stale prices and 60 stale photos today.12 from shelves · 0 to the depot · 0 trips · 6 stale
Chapter 4 of 7
Take it back
A 15-minute TTL fixed most stale prices but cost trips, and a few still slipped through. The team wants long TTLs and correct prices.
This chapter: How do you take back a copy you already handed out?
About this chapter
You will learn
- A purge drops a copy everywhere the moment it changes
- A versioned name gives changed content a new address
- Which suits prices, and which suits photos
Words you’ll meet
- Purge
- A message telling every cache to drop its copy of something, now.
- Versioned name
- A name that changes with the content, like hinge-2.jpg, so no cache holds the new one yet.
Step 1 of 4
Short TTLs cost trips. Instead, staff can send a when they change a price: every warehouse drops its copy.
Predict the stale prices.