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From "Ravi Gummadi (JIRA)" <j...@apache.org>
Subject [jira] Resolved: (MAPREDUCE-644) distcp does not skip copying file if we are updating single file
Date Tue, 15 Sep 2009 06:02:02 GMT

     [ https://issues.apache.org/jira/browse/MAPREDUCE-644?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Ravi Gummadi resolved MAPREDUCE-644.
------------------------------------

    Resolution: Duplicate

The code changes needed for this are included in the patch of MAPREDUCE-648.

> 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, d_singlefile_update644.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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