steveloughran commented on issue #1404: HDFS-13660 Copy file till the source file length during distcp URL: https://github.com/apache/hadoop/pull/1404#issuecomment-530420060 > With this new patch it fails with blocks not found exception as we are forcing it to read till a particular length. Do you want to write a testcase for this case ? yes. It's a change in behaviour, but probably a good one. A test will verify that things fail the way we expect -and will continue to do so. One little concern though: where does that filestatus come from? It's created in the mapper just before the operation, right? As if it's created when the list of files to copy is created (which I doubt...) then the current code handles the case where the file is changed between job schedule and task execution -that would be a visible regression, which we would have to worry about.
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