Github user tejasapatil commented on the pull request:
https://github.com/apache/spark/pull/13042#issuecomment-219128249
@vanzin : I haven't gathered numbers with `Files.walkFileTree`. Based on
its source code, it will have the same quirks wrt race conditions and speed. I
believe that `FileVisitor` interface is suited for custom (pre, visit, post,
failure) operations while visiting the tree.
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