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Have you looked at graph databases and how would you compare them to your with Citrusleaf document store?

A similar-sized ad network, CPX Interactive is running ad requests on InfiniGraph: http://www.youtube.com/watch?v=88HCKQ73nFU&feature=relat...

Seems like graphing engine would give you a lot of native search / lookup functionality for free.

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We don't need to do any advanced querying or search during the real-time bidding request process - it's just raw lookup based on "cookie ids" (we're not always using cookies). Simplicity of operations, horizontal scaleability and consistent, predictable performance are the key characteristics required.

Other parts of the system have very different requirements and yes, we are considering graph oriented databases for our cross-device analytics product.

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