Github user andrewor14 commented on the pull request:
https://github.com/apache/spark/pull/3559#issuecomment-69112310
@brennonyork we can't remove `--properties-file` because we need to
maintain backwards compatibility. We currently don't attempt to merge the
properties at all, but instead allow `--properties-file` to take precedence.
Note that the `--environment-file` case is different in that it's not as simple
as having the command line option overriding an equivalent environment variable.
I think the better approach is to simply warn the user in `spark-env.sh`
not to set `SPARK_CONF_DIR` there since this is somewhat minor of an issue in
my opinion. Given that there is not a clean way to fix this I recommend that we
close this issue.
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