Github user CodingCat commented on the pull request:
https://github.com/apache/incubator-spark/pull/626#issuecomment-35760516
@mridulm I tested that and found that it is actually not handled in Spark,
part-00000 and part-00001 are generated by the second run of the job (the
partition is set to 2)
part-00002 and part-00003 are generated by the first run of (partition
number of is set to 4),
I also found this when I run Spark over S3, the old file is still left over
in the output directory
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