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For NoSQL data stores, there's a significant amount of debate over using HBase vs Cassandra. Many HBase advocates point to the fact that HBase is used at Fb over cassandra. Can you comment on HBase in FB's architecture and which features you prioritized the most, leading FB to use it?

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Actually, we have a few examples of Cassandra being used here too: Buck uses it (http://facebook.github.io/buck/concept/buckconfig.html) and so do Instagram (http://planetcassandra.org/blog/post/instagram-making-the-sw...) ... so as with all of these things, we evaluate options on a case-by-case basis.

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