Twitter generates millions of events per second. It is a huge challenge to analyze these events in real time. Twitter designed and deployed a new streaming system called Heron. Heron has been in production since mid 2014 and is widely used for diverse use cases by several teams. In this talk, I will describe Heron in detail, in depth discussion of the demand of real time analyzing with a couple of use cases and share our operating experiences and challenges of running Heron at scale.