How to explain the huge time latency between two jobs? How to optimize the job to reduce the latency ?

[dududu]

I have met a problem , you can see in the picture as followed:

 

there is some long delay between some jobs , I don't understand what happened and how to optimize the job ? Can anybody help me ? Thanks a lot.

[jose_gonzalez]

Hi @jieping zhang​,

Did you check the driver's logs? do you see any error messages? please provide more details