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From "Ravi Gummadi (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-6051) distcp does not skip copying file if we are updating single file
Date Thu, 18 Jun 2009 18:12:07 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-6051?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12721391#action_12721391
] 

Ravi Gummadi commented on HADOOP-6051:
--------------------------------------

With -update, the path to which it copies a single file is correct. The issue is just that
it copies again and again even with -update, which it should not be doing. Will upload a patch
soon. Also will try to update the doc to reflect the correct behaviour.

> distcp does not skip copying file if we are updating single file
> ----------------------------------------------------------------
>
>                 Key: HADOOP-6051
>                 URL: https://issues.apache.org/jira/browse/HADOOP-6051
>             Project: Hadoop Core
>          Issue Type: Bug
>          Components: tools/distcp
>    Affects Versions: 0.21.0
>            Reporter: Ravi Gummadi
>             Fix For: 0.21.0
>
>
> 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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