Tinker08:00, no shelves.0 from shelves · 15 to the depot · 15 trips
Chapter 2 of 7
Keep a copy nearby
West’s pages crawl because every request crosses the country. The team wonders: what if each regional warehouse kept a copy of what it serves?
This chapter: What does a copy nearby save, and when does it still miss?
About this chapter
You will learn
- An edge cache keeps copies close to customers
- Hits skip the trip; misses make it once and keep the copy
- Hit rate, and what it does to the wait
Words you’ll meet
- Edge cache
- A store of copies close to customers, like a regional warehouse’s shelf: here, one per region.
- Hit
- A request answered from a copy on the shelf, with no trip to the depot.
- Miss
- A request the shelf can’t answer: it goes to the depot, and the shelf keeps the reply.
- Hit rate
- The share of requests that are hits.
Step 1 of 5
Each warehouse can keep a copy on its shelf: an . A request answered from there is a .
Turn on the shelves.