Github user hellertime commented on the pull request:
https://github.com/apache/spark/pull/3074#issuecomment-64228513
The slaves will need to pull the image you specify from a Docker Hub (or
you can pre-pull using the command-line client on each node).
If your image is in the main docker hub than that is what all slaves will
use.
If you have a base Dockerfile which includes spark, and the appropriate
libmesos.so, and you add to that your python dependencies you should be good to
go.
You can even test by running a standalone Spark inside the image to make
sure the paths are OK.
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