问题
I want to get both duration times: the exact time of start up of the Virtual Machines deployed in Compute Engine, and the real execution time of the Pipeline, when a Dataflow Job ends (which is much less than the elapse time showed by the Job in the Dataflow website)
I need to get these duration times from Java, and maybe if I can get these values directly from Google Cloud website will be fine also.
来源：https://stackoverflow.com/questions/45122068/how-to-get-the-real-execution-time-of-a-pipeline-and-the-duration-time-of-start