Intermittent failure of LocatedFileStatusFetcher.getFileStatuses(), which is using globStatus to find files.
I'd say "turn s3guard on" except this appears to be the case, and the dataset being read is
over 1h old.
Which means it is harder than I'd like to blame S3 for what would sound like an inconsistency
We're hampered by the number of debug level statements in the globber code being approximately none; there's no debugging to turn on. All we know is that globFiles returns null without any explanation.