Github user tgravescs commented on the pull request:
https://github.com/apache/spark/pull/29#issuecomment-36286358
I believe secrets are mostly for users adding secrets for other services.
secrets are also used by the MR2 framework. secret keys are supported in MR1
via Credentials, I believe they just added the convenience methods to
UserGroupInformation in mr2 for dealing with them. It looks like MR1 handled
credentials through the JobConf.
So I guess if you don't mind, overriding it for Yarn at least to pass them
along might be best.
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