Github user cloud-fan commented on the issue:
https://github.com/apache/spark/pull/22887
> Basically, if my "core-size.xml" says
"mapreduce.input.fileinputformat.split.maxsize" is 2, and my Spark conf says
"spark.hadoop.mapreduce.input.fileinputformat.split.maxsize" is 3, then the
value from the config generated by the method you're changing must be 3.
I think this is what this PR tries to fix? the `hadoopConf` parameter of
`appendS3AndSparkHadoopConfigurations` is either an empty one, or a one from
`spark.SessionState.newHadoopConf()` which contains user-provided hadoop conf.
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