Design Google Search Query Serving · System Design Interview

Design Google Search Query ServingDesign only the serving path of a web search engine at Google’s size: a query arrives and ten results have to come back in a fraction of a second from an index of hundreds of billions of pages. Latency, scalability and availability are the whole exercise.What it has to do

A query returns its top results ranked, within the latency budget

Every query is answered, even while machines are failing

A newly indexed page becomes findable without rebuilding everything

Scale

Queries per second: 100,000

Pages in the index: 400 billion

Index size: 100 petabytes

Out of scope

Crawling

How relevance is scored

Autocomplete

Ads

Personalisation

The results page itself

Practise this challengeAll system design challenges

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