Github user WangTaoTheTonic commented on the pull request:
https://github.com/apache/spark/pull/2454#issuecomment-56276648
I think it is better using lazy val for readability(putting all elements of
defaultSparkProperties into value properties is more comfortable than
conversely) and not using clone to avoid shallow copy( I did not do deep
research about clone methods in scala and take it same as in Java. Please point
it out if not).
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