From O’Reilly Data Newsletter (9/10/14):

“Josh Rosen built a tool for browsing pull requests that lets you scan each of the major components (Spark SQL, Streaming, MLlib, etc.). Now that Spark has become one of the most active open source projects in big data, tools like this make it easier for outsiders to follow what Spark developers are up to.”

As of this writing, it’s showing 242 open pull requests across the Spark core as well as MLib, GraphX