title: Spark UI for Streaming jobs
body: <p>In the Streaming tab of the spark UI, I am looking at the Output Op Id, first colum that comes up after clicking on any microbatch link in the Streaming tab of Spark UI - it has job id numbers 0,1,2,3. Does it mean that all these jobs are running in parallel? Each job id corresponds to a function call in the driver code. Or are they sequential? How can I make out if different functions of the code are running concurrently, from the DAG or the Spark UI?</p>