High load: Atomic Increment + Get operation

Hi guys,
I’m trying to use a cluster Couchbase with high load on the servers. (Couchbase 2.2.0 nodejs SDK 2.0.0-dp1)
I want to use for capping purposes, which means a lot of massive increment on some keys, and lots of gets of the same keys, in order to verify if we reached a certain value or not.
Since these capping always exceeds a bit, I wanted to confirm with you guys that several operations on the cluster (done in different servers at the same time) are really atomic.

For instance if I do Increment in one server, and just after I do Get in another server, how can I be sure that I’ll get the right value?

Thanks in advance!!!