I think I find the answer.. On the UI, the recording time of each task is when it is put into the thread pool. Then the UI makes sense
At 2015-08-18 17:40:07, "Todd" <bit1...@163.com> wrote: Hi, Following is copied from the spark EventTimeline UI. I don't understand why there are overlapping between tasks? I think they should be sequentially one by one in one executor(there are one core each executor). The blue part of each task is the scheduler delay time. Does it mean it is the delay that the task is put into the thread pool and the task is picked to run?
