Github user yaoshengzhe commented on the pull request:
https://github.com/apache/spark/pull/126#issuecomment-37475144
@Tathagata, I am strongly disagree to put cleanup logic in finalize.
Finalizers are unpredictable, often dangerous, and generally unnecessary, e.g.
there is a severe performance penalty for using finalizers for object creation
and destroy, please see
http://www.informit.com/articles/article.aspx?p=1216151&seqNum=7 for more
details.
I would suggest to call RDD.cleanup explicitly once we know it is no longer
being used.
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