How can large amounts of processed data be ported from a Big Data platform directly to a relational database?

The Poly Sink compound pattern represents a part of a Big Data platform capable of egressing high-volume, high-velocity and high-variety data out to downstream enterprise systems.

How can processed data be ported from a Big Data platform to systems that use proprietary, non-relational storage technologies?

How can processed data be exported in realtime from a Big Data platform to other systems?