Github user WangTaoTheTonic commented on the pull request:
https://github.com/apache/spark/pull/3823#issuecomment-68257882
@OopsOutOfMemory Thanks for your comment and I understand your concern.
Actually it doesn't matter that if SPARK_CONF_DIR does not exist here
because we can use `$SPARK_HOME/conf` instead. And checking logic of properties
file contains that of SPARK_CONF_DIR.
In other places of spark codes, we usually use a `getOrElse` logic to
handle configuration.
It is easy to analyse when use got some specific config wrong and we'd
better not to broke this tradition. :)
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