Blocker Description
Currently for receiver-based input streams, Spark Streaming offers ReceiverTracker and ReceivedBlockTracker to track the status of receivers as well as block information. Also this status and block information can be retrieved from StreamingListener to expose to the users.
But for direct-based (receiver-less) input streams, Current Spark Streaming lacks such mechanism to track the registered direct streams, also lacks the way to track the processed number of data for direct-based input streams.
Here propose a mechanism to track the register direct stream, also expose the processing statistics to the BatchInfo and StreamingListener.