Github user vanzin commented on the issue:
https://github.com/apache/spark/pull/22887
Sorry, this is a breaking change. It changes the behavior from "I can
currently override any Hadoop configs, even final ones, using spark.hadoop.*"
to "I can never do that".
If there's an issue with the SQL "set" command that needs to be addressed,
this is the wrong place to do it.
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.
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