Github user andrewor14 commented on the pull request:
https://github.com/apache/spark/pull/5478#issuecomment-93790785
Also, how big is the actual zip? I would imagine that it's at least one or
two orders of magnitude smaller than the assembly jar, so it shouldn't be
expensive especially if we cache it. As others have pointed out, the whole
point of Spark on YARN is that the user doesn't need to install it on every
node, and doing this through `spark.executorEnv.PYTHONPATH` defeats this
purpose.
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