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Wh<strong>at</strong> do we need in a d<strong>at</strong>a store?<br />
▪ Requirements for <strong>Facebook</strong> Messages<br />
▪ Massive d<strong>at</strong>asets, with large subsets of cold d<strong>at</strong>a<br />
▪ Elasticity and high availability<br />
▪ Strong consistency within a d<strong>at</strong>acenter<br />
▪ Fault isol<strong>at</strong>ion<br />
▪ Some non-requirements<br />
▪ Network partitions within a single d<strong>at</strong>acenter<br />
▪ Active-active serving from multiple d<strong>at</strong>acenters
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