To me, it seems the best thing to do in that scenario is taking the huge "shard ...

jfoster on Sept 28, 2016 | parent | context | favorite | on: What I Wish I Had Known Before Scaling Uber [video...

To me, it seems the best thing to do in that scenario is taking the huge "shard by city" gain when it comes to rides. Then dealing with the global nature of users by having global user DBs sharded by user ID.