Github user vanzin commented on the pull request:
https://github.com/apache/spark/pull/6676#issuecomment-110502025
> Since those child processes are run using the same user account
Standalone is not secure no matter what you do. If you want to prevent
users that are not the user running the Spark daemons from reading the secrets
of Spark apps, then you can easily do that by using env variables.
You can't protect different Spark apps from each other since they're all
running as the same user in standalone mode.
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