Github user vanzin commented on the pull request:
https://github.com/apache/spark/pull/1233#issuecomment-47373161
Ah, so it's SPARK-2098.
I think it's a nice feature to have (I filed the bug after all), but we
can't break the existing semantics. For daemons, the command line parsers could
do that (by having a "--properties-file" argument similar to spark-submit).
But if you want to support arbitrary SparkConf instances to read these conf
files, it will become trickier, since now you need to propagate that command
line information somehow.
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