Github user srowen commented on the pull request:
https://github.com/apache/spark/pull/6434#issuecomment-106232448
A subclass of `RuntimeException` is appropriate then. I use
`IllegalArgumentException` for something basically related to input to the
method, and `IllegalStateException` as a more general subclass of
`RuntimeException`. It's quite minor, but while we're here, I'd rather do what
I think is the general best practice in Java-land.
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