The Ledger
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AppNexus operated about 1,500 global bidding server instances
“These bidding instances, there's actually about 1500 of them spread in data centers around the world”
AppNexus processes 30 billion daily impressions on a 16-node Hadoop cluster
“We have a 16 node Hadoop cluster currently, and I have on my proposed budget for 2015, a 200 node Hadoop cluster so that we can really get our hands on all that raw data of the thirty billion impressions we're transacting daily.”