In the past few years or since Hadoop graduation in apache.org, there has been many contribution almost on a daily basis addressing anything on this magic platform from data streaming to real-time analytics.
Although a little bit late to both parties (cloud and big data) Microsoft has now a solid platform for Hadoop ecosystem. But it is still advisable for architects to avoid any vendor lock-in (U-SQL for example).
This diagram shows some basic and high level view of Hadoop on Azure. Not a complete solution but it should give your architects or you (if you are the architect of your company) a good starting point and some nice graphics too in SVG format.