Ask HN: Best way or pattern to provide analytics?

Hi there, I work as an independent consultant. Currently I am helping my customers optimising analytics on their hadoop cluster. During my work, an very interesting question is raised in my mind. So I would like to ask if some of you could share some experiences.

Normally we would perform analytics (any kind of ML, Regression, Clustering, etc.) on some kinds of isolated computing cluster, e.g. gg cloud, ec2 or in house hadoop cluster. Serving the results requires us to implement many RESTful APIs. However, to my best of knowledge, I couldn't find any pattern or best practice guides for providing the data inside the cluster through a RESTful API to consumers, other department who will integrate the data to the main customer portal (so we don't have to care about providing real time analytics). Given the cluster is not directly accessible from the outside, any recommendation to create a reliable & secured RESTful platform?