Github user vanzin commented on the pull request:
https://github.com/apache/spark/pull/5386#issuecomment-90643719
No, this is not correct. This is sub-optimal but necessary. If there is a
new application that is added between polls but somehow happens to have the
same mod time as the last poll, this patch would make that application be
missed.
The current code is a little paranoid, but at least it's correct.
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