Design an Ad Click Aggregation Service · System Design Interview

Design an Ad Click Aggregation ServiceDesign the pipeline that counts ad clicks and impressions per ad and per minute, accurately enough that advertisers are billed from it.What it has to do

Ingest click and impression events from many sources

Report counts per ad, per campaign and per minute

Never count the same click twice, even when an event is delivered twice

Correct the counts when late events arrive

Scale

Click events per second: 1 million at peak

Active ads: 100 million

Out of scope

Choosing which ad to show

Fraud scoring models

Invoicing and payment

The advertiser dashboard itself

Practise this challengeAll system design challenges

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