steveloughran commented on issue #606: HADOOP-16190. S3A copyFile operation to include source versionID or etag in the copy request URL: https://github.com/apache/hadoop/pull/606#issuecomment-482727455 bq. . There we only apply constraints indicated by the fs.s3a.change.detection configuration whereas here you apply constraints regardless of that config. You probably already realize this, but just wanted to be sure. Still, I'm not bothered enough by the inconsistency to say you shouldn't go ahead with it if you like. I couldn't see way of turning not making this mandatory, and at the same time, why anyone wouldn't want a single copy to be of a single file, not a mixture of blocks. If I'd known that this problem existed and could be stopped, I'd had have this patch in a long time ago. I'll probably backport all the way to hadoop 2.8+ for that reason -which is not something I was planning for the input stream code.
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