Github user andrewor14 commented on the pull request:
https://github.com/apache/spark/pull/9321#issuecomment-167644002
> On the other hand, I cannot see serious issues by allowing user to
potentially read any files under workerDir, it will display the bytecode if
reading a jar file but I think the user already have full control access to all
the files under workerDir, except for maybe other spark app's jar files.
What if I have some plain text secret (e.g. private key) in some file?
Anyone with access to the UI will be able to read it.
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