Github user Stibbons commented on the issue:

    https://github.com/apache/spark/pull/13599
  
    Maybe we can try to split this work in several parts to ease merge. I 
clearly think python job should be deployed a bit like jar dependencies are 
specified for scala (with `--packages`), and this proposal provides such 
feature to Pyspark.
    For the moment, Python deployment described in this PR works on standalone 
environment, and according to Jeff on YARN as well, and I soon I have the Mesos 
cluster configured (We are close to have it working here at work), we then can 
cover the main 3 deployment method.
    Could it be possible to have iterative merges, starting with a limited 
support (maybe behind a feature gate/"experimental feature"?) and iteratively 
increasing the extend of this feature, instead of a big bang change that is 
unfortunately not yet merged :( ?


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