Github user markgrover commented on the issue:
https://github.com/apache/spark/pull/15971
> Does this protect against doing sc.getConf.getAll.foreach(println) in
spark shell ?
No, it doesn't. The goal of the JIRA is the first step - to stop printing
sensitive information all over the place.
If a user has access to spark-shell (say, in a cluster secured through
kerberos), it may be reasonable for them to see the sensitive information.
This, however, prevents anyone from going to the unauthenticated Spark UI,
and having all the creds to S3.
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