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https://issues.apache.org/jira/browse/HADOOP-16878?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17066757#comment-17066757
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Gabor Bota commented on HADOOP-16878:
-------------------------------------

PR is up with the small change and test.

> Copy command in FileUtil to throw an exception if the source and destination 
> is the same
> ----------------------------------------------------------------------------------------
>
>                 Key: HADOOP-16878
>                 URL: https://issues.apache.org/jira/browse/HADOOP-16878
>             Project: Hadoop Common
>          Issue Type: Improvement
>    Affects Versions: 3.3.0
>            Reporter: Gabor Bota
>            Assignee: Gabor Bota
>            Priority: Major
>
> We encountered an error during a test in our QE when the file destination and 
> source path were the same. This happened during an ADLS test, and there were 
> no meaningful error messages, so it was hard to find the root cause of the 
> failure.
> The error we saw was that file size has changed during the copy operation. 
> The new file creation in the destination - which is the same as the source - 
> creates a file and sets the file length to zero. After this, getting the 
> source file will fail because the sile size changed during the operation.
> I propose a solution to at least log in error level in the {{FileUtil}} if 
> the source and destination of the copy operation is the same, so debugging 
> issues like this will be easier in the future.



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