I can't find where it says it's per customer. It says they have "a few physical shards". From what I understand, they had a few physical DB servers which stored

I can't find where it says it's per customer. It says they have "a few physical shards". From what I understand, they had a few physical DB servers which stored their own subsets of data. When a request came in, the appropriate DB server was selected based on photo or user ID. P.S. Here's more information: https://instagram-engineering.tumblr.com/post/10853187575/sharding-ids-at-instagram https://instagram-engineering.tumblr.com/post/10853187575/sh...