Github user watermen commented on the pull request:
https://github.com/apache/spark/pull/7210#issuecomment-119863985
@liancheng I think `CombineFileIntputFormat` load data more balanced than
`coalesce`, for example, parent RDD partition num is 3 and I want to coalesce
to 2.
```
coalesce ---> Parquet partition: [100MB] [100MB] [1MB]. Child partition:
[100MB 100MB] [1MB]
CombineFileIntputFormat ---> Parquet partition: [100MB] [100MB] [1MB].
Child partition: [100MB 28MB] [72MB 1MB]
```
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