Apache Lens

Apache Lens is an aggregation system that acts like an umbrella project for various data storage mediums.

Lens will act like an intermediary, taking user queries and sending them to each service in its own specific query language and syntax.

It will then retrieve the results and make them available to the developer, concatenating all the data.

This is done through a shared schema and metadata layer which acts as a translation system between various client applications and the data storage platforms.

Apache Lens comes packed with lots of features, like cost-based engine selection, driver-based architecture, support for a REST server, and lots of client libraries.