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-482391181 #646 is the big one, which does a lot more than this, This one just hardens copy even without s3guard, when you have a large enough file that the transfer manager decides to do bits in parallel. I think this one is probably the "straightforward to backport version" which we can pull back into 3.x line without risk. The #646 patch is something big enough it's going to have to go into trunk, and we'll worry about whether to put it into 3.2.x when and only when we are all happy with it working in our day-to-day experience, tests etc. Now, if this one went in, and I pulled it back to the older versions, would this change be a problem for you, even if your patch just completely stamps on it? Because once the big patch is in, I'm not going to worry about this one -except in those older releases.
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