This is a request to do some cosmetic improvements on top of
HDFS-8480. There a couple of File -> java.nio.file.Path conversions which is a little bit distracting.
The second aspect is more around efficiency, to be perfectly honest I'm not sure what the number of files that may be processed. However as
HDFS-8480 eludes to it appears that this number could be significantly large.
The current implementation is basically a collect and process where all files first is being examined; put into a collection and after that processed.
HDFS-8480 could simply be further enhanced by employing a single iteration without creating an intermediary collection of filenames by using a FileWalker