Github user vanzin commented on the pull request:
https://github.com/apache/spark/pull/5886#issuecomment-101352117
> what about introduce a hashMap to maintain the filename, modifiedTime of
each file
That is pretty expensive for all files - hash maps use a ton of extra
memory per entry. If you do that just for the files that have `modTime >
lastScanTime`, that's a lot more manageable. Not great, but I can't think of
anything better at the moment.
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