Github user tgravescs commented on the pull request:
https://github.com/apache/spark/pull/3409#issuecomment-65149255
@vanzin I'm not really following where you are going with the questions?
Spark started out having many configs be the same across everything but there
are many cases they could and should be different so split them apart again.
Having things separate allow for more flexibility. Yes you may have to
duplicate a setting but it shouldn't be a big deal to put it in 2 places in the
configs. If other files (hdfs-site, core-site) support them they can currently
be set via executor.extraJavaOptions and driver.extraJavaOptions. The only
thing it can't be set on is the ApplicationMaster in client mode.
I agree that its a bit weird that the user has to do 2 different things
between client and cluster mode but the fact is they run differently. Until
we can fix that there are things that might be different.
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