Github user steveloughran commented on the pull request:

    https://github.com/apache/spark/pull/12487#issuecomment-211956689
  
    Thomas: regarding credential printing, what about having some regexps of 
things not to print. In particular, credentials to talk to S3, Azure &c are 
things that may get into the spark conf, which you don't want to have broadly 
visible


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