Github user sryza commented on the pull request:
https://github.com/apache/spark/pull/5478#issuecomment-93061403
IIUC, the motivation for this change is that the assembly jar distribution
mechanism doesn't work for some Java versions.
I agree with Andrew that, if at all possible, we should avoid deployment
models that expect PySpark or anything to be on every node. Even if we advise
against it, it increases the number of places one needs to check when debugging
why something does or does not appear on the executor PYTHONPATH.
Are there workarounds for the Java versions issue that don't require python
to be installed on the NodeManagers?
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