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Instagram Data Storage - Why not a Graph database?

Why do they recommend something like Cassandra when you have this complex graph of followers? Is this not an ideal application for a graph database?

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Same question! Not only this but also for typeahead, we can simply use ElasticSearch rather than writing Trie structure and adding a layer of code only to manage it. It will be very good to know the background of such solutions and if its better in any circumstances.

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Same questions - thanks!