Design Ad Click Aggregator
An ad click aggregator is a system that collects, deduplicates, and aggregates billions of ad click events to provide accurate metrics for billing advertisers and powering analytics dashboards.
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The core challenge is processing massive volumes of click data in real-time while guaranteeing accuracy. Every click directly translates to money, so the system cannot afford to lose events or count duplicates. Advertisers pay per click, and publishers get paid per click, making data integrity paramount.
Popular Examples: Google Ads reporting, Meta Ads Manager, Amazon Advertising analytics, Twitter/X Ads dashboard
What makes this problem fascinating from a system design perspective is the combination of challenges it presents.
You need to handle extreme write volumes (hundreds of thousands of events per second), guarantee exactly-once processing (no duplicates, no missed events), support flexible aggregations across multiple dimensions, and serve queries with low latency.
These requirements often conflict with each other, forcing you to make interesting trade-offs.
In this chapter, we will explore the high-level design of an ad click aggregator.
Lets start by clarifying the requirements.