Github user HyukjinKwon commented on the pull request:
https://github.com/apache/spark/pull/11806#issuecomment-198200770
@rxin According to [Hadoop Definitive Guide 3th
edition](https://www.safaribooksonline.com/library/view/hadoop-the-definitive/9781449328917/ch04.html),
it looks it is right configurations to the unit of compression (record or
block).
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