Github user srowen commented on the issue:
https://github.com/apache/spark/pull/14650
Responding to
https://github.com/apache/spark/pull/14650#issuecomment-241095780 , IMHO it's
best if configuration never uses environment variables or system properties.
They're global to a process and that eventually ends in some tears, despite its
convenience. Hence I personally support standardizing towards explicit
configuration.
In practice some env variables are used here and there for legacy reasons.
And yes you can set props via system properties. I think being consistent is
OK, right or wrong, but would generally move away from env / sys properties if
given the choice.
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