Github user liancheng commented on the pull request:
https://github.com/apache/spark/pull/2616#issuecomment-57925374
The reason why `_SUCCESS` is reserved is because semantics of
`FileSystem.globStatus` got changed, and `Utilities.getFileStatusRecurse`
relies on it to find out all partition data files.
Test code:
```scala
object GlobExperiments extends App {
val conf = new Configuration()
val fs = FileSystem.getLocal(conf)
fs.globStatus(new Path("/tmp/wh/*/*/*")).foreach { status =>
println(status.getPath)
}
}
```
Target directory structure:
```
/tmp/wh
âââ dir0
â  âââ dir1
â  â  âââ level2
â  âââ level1
âââ level0
```
Hadoop 2.4.1 result:
```
file:/tmp/wh/dir0/dir1/level2
```
Hadoop 1.0.4 resuet:
```
file:/tmp/wh/dir0/dir1/level2
file:/tmp/wh/dir0/level1
file:/tmp/wh/level0
```
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