Twitter last week unveiled Heron as the successor to Apache Storm for its own internal streaming analytic system. While Storm helped Twitter analyze huge amounts of data for years, and subsequently open sourced the software to the world in 2011, it’s evident that at this point Storm is petering out.Twitter’s main goals with Heron were to increase performance predictability, improve developer productivity, and ease manageability, Twitter Engineering Manager KarthikRamasamy wrote in a blog piece.While Heron is not available as an open source project yet, it’s widely expected that Twitter will take that step. The bad news for Storm users is that the company that originally developed it has moved on because it was difficult to scale and use