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What is the search algorithm used by the Google search engine? What is its complexity?

He goes through the evolution of the Google Search Serving Design and through Map Reduce while giving general advice about building large scale systems.


 All About The New Google “Hummingbird” Algorithm

 
Google has a new search algorithm, the system it uses to sort through all the information it has when you search and come back with answers. It’s called “Hummingbird” and below, what we know about it so far.
When did Hummingbird start? Today?
Google started using Hummingbird about a month ago, it said. Google only announced the change today.

What does it mean that Hummingbird is now being used?
Think of a car built in the 1950s. It might have a great engine, but it might also be an engine that lacks things like fuel injection or be unable to use unleaded fuel. When Google switched to Hummingbird, it’s as if it dropped the old engine out of a car and put in a new one. It also did this so quickly that no one really noticed the switch.

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