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The Clojure brain behind

40 billion req/day

a story of deploying clojure into production

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About

World's largest, 100% self-serve, mobile demand-side platform (DSP) for programmatic mobile.

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Dapeng, backend tech lead

http://verydapeng.com

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Exchange

yes! I will pay $0.01

ad needed

do you want?

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problem

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Customer

Campaign

Order

Region

Bidder

Campaign

Order

Region

Bidder

$

Buffer

$

Spending

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λ (pyramid, spend, buffer, when) => [allocation]

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Java

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(def software (+ data functions))

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Clojure to the rescue!

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json mapping like a boss

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data => λ => data

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testing

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transaction w/o db

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logging

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Deployment - upstart

description "start the brain!!!"

chdir "/opt/brain/"

start on runlevel [2345]

exec java -server -jar brain.jar >> logs/brain.log 2>&1

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Challenge - Tools

Cursive, CCW, Emacs, Vim

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Challenge - Developers

no more accumulators, no more loops

map, filter, reduce are your new friends

less HOW, more WHAT

think in data

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Challenge - Bus factor

Keep it simple

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))))))))))))

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Q&A

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We are hiring!