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Re:Microsoft Wants To Buy Love In Silicon Valley by mark_l_watson on Wednesday February 11, 2015 @04:53PM (#9035967)
This might be what you are looking for, but I think Azure Marketplace has Cassandra, MongoDB, CouchDB, etc.

AWS does offer some very special purpose data stores like DynamoDB and SimpleDB but I have not used them much.

Re:Microsoft Wants To Buy Love In Silicon Valley by rjbwork on Thursday February 12, 2015 @10:01AM (#9039007)
I may have to look into the Cassandra one, since there is apparently a Data Warehousing framework called Spark that is built on top of it. The others are not suitable to OLAP processing or data warehousing I believe.