java - Using a nosql database for very large dataset with small data size highly written and moderate read -

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what better nosql database creating system record advertisement data 50 200 millions insert per day, aggregation of data used show pattern of how users engage ads. mongodb seems major industry players picking riak job. seems mongo had flush caveats in last 2 releases , current version seems pretty job, idea?

it seems mongodb hadoop (http://docs.mongodb.org/ecosystem/tutorial/getting-started-with-hadoop/ ) fits data requirements. can store data in mongodb , run aggregation jobs (map/reduce) on hadoop cluster.


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