how does sc.textFile translate regex in the input.

[Pradeep Nayak]

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