Github user vanzin commented on the issue:

    https://github.com/apache/spark/pull/20192
  
    > users with custom docker images can override the classpath by
    
    I wrote this in a comment above, but there needs to be a proper definition 
of how to customize these docker images. There needs to be a contract between 
the submission code, the entry point, and how stuff is laid out inside the 
image, and I don't see that specified anywhere.
    
    However that's done, I also would suggest that env variables be avoided.


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