Where do the executors get my app jar from?

[James Yu]

Hi,

When I spark submit a Spark app with my app jar located in S3, obviously the 
Driver will download the jar from the s3 location.  What is not clear to me is: 
where do the Executors get the jar from?  From the same s3 location, or somehow 
from the Driver, or they don't need the jar?

Thanks in advance for explanation.

James