[jira] [Updated] (HADOOP-16878) Copy command in FileUtil to throw an exception if the source and destination is the same

["Gabor Bota (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HADOOP-16878?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Gabor Bota updated HADOOP-16878:
--------------------------------
    Status: Patch Available  (was: In Progress)

> 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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