Github user steveloughran commented on the issue:
https://github.com/apache/spark/pull/17080
@srowen dont worry, been tracking this: I filed the JIRA. Core code is good
(i.e. property/env var names).
One thing to bear in mind, the existing code propagates the env vars even
if you are submitting work to a cluster running in EC2, which will be using EC2
instance metadata as a source for its credentials. Nobody has publicly
complained about that in JIRA/stack overflow, and changing the behaviour may
have adverse consequences. This patch does not change that situation
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