Github user vanzin commented on the issue:
https://github.com/apache/spark/pull/17859
> Do we need remove the comments from template config?
Ah, that would be a good idea. I also noticed it's still used in
`YarnSparkHadoopUtil.scala`, so that could be removed too.
I also took a closer look at SPARK-17979 and this particular env variable
wasn't removed in that change; seems it was removed much earlier (SPARK-9092 as
far as I can tell), so looks it isn't very widely used.
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