Github user CodingCat commented on the pull request:
https://github.com/apache/incubator-spark/pull/626#issuecomment-35841703
@pwendell Thanks for the comments, I also considered what you mentioned,
but will that prevent other components like Spark Streaming from doing the
right job? (I'm not familiar with streaming, but it seems that it will
overwrite the existing directory...)
Also how to prevent the situation that the user occasionally run the job
over the same directory for two times, but with different partition number (the
second running has smaller value); eventually, the directory will contain the
results from two runnings.
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