Github user liancheng commented on the pull request:
https://github.com/apache/spark/pull/6130#issuecomment-101883107
Summary of offline discussion with @yhuai for future reference:
For `mapred` API, users can customize committer class via
`mapred.output.commit.class`, but customized classes should be subclasses of
`o.a.h.mapred.OutputCommitter`. For `mapreduce` API, output committers are
always retrieved from `mapreduce.OutputFormat` instances, and there seems to be
no genuine way to freely customize committer class. That's why @yhuai had to
introduce a new property.
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