Github user pwendell commented on the pull request:
https://github.com/apache/spark/pull/714#issuecomment-42748190
Hey @witgo @andrewor14. I thought I commented earlier but it appears the
comment didn't get posted.
I think it would be a good idea to validate this at the time of `SparkConf`
construction rather than have validations scattered throughout the code.
https://github.com/apache/spark/blob/master/core/src/main/scala/org/apache/spark/SparkConf.scala#L213
Also - it would be good to echo back the value that was set to the user.
Sometimes users don't know where a configuration option is coming from:
```
if (memoryFraction > 1 || memoryFraction < 0) {
val msg = s"spark.storage.memoryFraction should be between 0 and 1 (was
'$memoryFraction')."
throw new IllegalArgumentException(msg)
}
```
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