Github user andrewor14 commented on the pull request:
https://github.com/apache/spark/pull/9321#issuecomment-164617399
@yongjiaw I believe the changes here actually have security implications.
Previously the viewers could only read `stderr` and `stdout` files on the
executor machines, but now they can read anything. If you can limit the files
accessible to the log4j ones then we can proceed safely.
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