Github user tzulitai commented on the issue:
https://github.com/apache/flink/pull/2914
Thanks for the clarification.
>
If the user has provided AWS_SECRET_ACCESS_KEY and AWS_ACCESS_KEY_ID,
regardless of the credential provider type provided (i.e. even if it's set to
AUTO / SYS_PROPS etc.), the BASIC type will be used.
I misunderstood your code before, so scratch this, sorry about that.
Your recent updates look good, +1 to merge after Travis finishes a test run.
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