Github user pwendell commented on the pull request:
https://github.com/apache/spark/pull/4799#issuecomment-76564115
I agree @andrewor14 can you add documentation about deprecated configs?
I would extend what's there now:
```
Properties set directly on the SparkConf take highest precedence, then
flags passed to spark-submit or spark-shell, then options in the
spark-defaults.conf file. A few configuration keys have been renamed
since earlier versions of Spark; in such cases, the older key names are
still
accepted, but take lower precedence than any instance of the newer key.
```
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