Github user JoshRosen commented on the pull request:
https://github.com/apache/spark/pull/1616#issuecomment-54376322
Actually, I don't think the timestamp will help us here:
If app A and B simultaneously add files named `foo.txt` and simultaneously
attempt to download this file on the same worker (from different executors),
then both will see that the cached file doesn't exist and both will attempt to
download the file by calling the old `fetchFile` with the same name and target
directory. This creates a race condition, since they're both attempting to
write different contents to the same `targetFile`.
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