Gabor Bota created HADOOP-16878:
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             Summary: Copy command in FileUtil to LOG at warn level 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


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 new 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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