Github user vanzin commented on the issue:
https://github.com/apache/spark/pull/18940
If you're removing a public config, you should at least add it to
`SparkConf.deprecatedConfigs`. It would be nice, but not required, to have some
kind of mapping of the old value to the new (in which case you'd use
`SparkConf.configsWithAlternatives` instead).
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