Github user andrewor14 commented on the pull request:
https://github.com/apache/spark/pull/8832#issuecomment-142158322
> if the master does not contain deploy mode information, the deploy mode
is "client",
else get deploy mode from the master URL.
We're actually deprecating the master URLs `yarn-client` and `yarn-cluster`
(#8385). In general I find it pretty confusing to have the deploy mode embedded
in the master URL.
> I think this issue is not related to SparkR only. @andrewor14, any policy
when handling default configurations when a spark-application is not launched
via spark-submit? Should we extract some logic from spark-submit so that the
logic can be called in non-spark-submit cases to keep consistency?
We do have the launcher library, but beyond that I don't think this is
something we support because it gets pretty difficult to maintain. AFAIK deploy
mode is the only such config so this should be fine.
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