mukund-thakur commented on issue #1404: HDFS-13660 Copy file till the source file length during distcp URL: https://github.com/apache/hadoop/pull/1404#issuecomment-530394268 > I also need to know what happens when a file is truncated. Before it would probably just finish and be happy one read() returned -1. Now it can differentiate between read-all-data and read-less-data. This is good-and we need to take advantage of it by failing when this happens (at the very least, reporting it).Can you add a test which uses truncate() to force this > I checked the behaviour of distcp on a cluster on what happens when truncate call is made while copy is running. * With the current trunk distcp it runs fine and copies the data till a particular length. ( Same as you said above - Distcp will be happy once read() return -1) * 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 ??
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