It is described in "Hadoop Definition Guild", chapter 3, FilePattern
https://www.safaribooksonline.com/library/view/hadoop-the-definitive/9781449328917/ch03.html#FilePatterns
Yong

From: pradeep1...@gmail.com
Date: Wed, 13 Apr 2016 18:56:58 +0000
Subject: how does sc.textFile translate regex in the input.
To: user@spark.apache.org

I am trying to understand on how spark's sc.textFile() works. I specifically 
have the question on how it translates the paths with regex in it.
For example:
files = sc.textFile("hdfs://<server>:<port>/file1/*/*/*/*.txt")
How does it find all the sub-directories and recurses to all the leaf files. ? 
Is there any documentation on how this happens ?
Pradeep                                           

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