How much cpu or nodes do I need when I have to handle 10k request per second?

Anyone using Couchbase and receiving more then 10k request per second ? How many nodes and vcpu you have and what is your average cost?

That will depend a lot on what the requests are (get/insert/upsert/replace/delete) and the size of the documents, and the residency ratio. The utility cbc-pillowfight can be used to generate load.