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From "Tsz Wo (Nicholas), SZE (JIRA)" <j...@apache.org>
Subject [jira] Commented: (MAPREDUCE-644) distcp does not skip copying file if we are updating single file
Date Tue, 08 Sep 2009 20:30:00 GMT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-644?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12752723#action_12752723
] 

Tsz Wo (Nicholas), SZE commented on MAPREDUCE-644:
--------------------------------------------------

Hi Ravi, you may check whether fileCount + dirCount > 0 in DistCp.setup(..) for unit tests.

If you have already done manual tests, could you "Also please list what manual steps were
performed to verify this patch"?

> distcp does not skip copying file if we are updating single file
> ----------------------------------------------------------------
>
>                 Key: MAPREDUCE-644
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-644
>             Project: Hadoop Map/Reduce
>          Issue Type: Bug
>          Components: distcp
>            Reporter: Ravi Gummadi
>            Assignee: Ravi Gummadi
>         Attachments: d_singlefile_update.patch
>
>
> distcp doesn't skip copying file when we do -update on single file if the destfile already
exists.
> When we do 
> hadoop distcp -update srcfilename destfilename
> it seems to be comparing checksums of srcfilename and destfilename/srcfilename and so
skip is not done. It should compare checksums of srcfilename and destfilename.

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