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Date: Thu, 18 Jun 2009 11:04:07 -0700 (PDT)
From: "Tsz Wo (Nicholas), SZE (JIRA)" <jira@apache.org>
To: core-dev@hadoop.apache.org
Subject: [jira] Commented: (HADOOP-6051) distcp does not skip copying file
 if we are updating single file
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    [ https://issues.apache.org/jira/browse/HADOOP-6051?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12721384#action_12721384 ] 

Tsz Wo (Nicholas), SZE commented on HADOOP-6051:
------------------------------------------------

> I guess we need to change the doc. OR Do we really need to change the behaviour of distcp ?

Thanks for checking this Ravi.  The doc actually is not clear about copying a single file, which, as always, is a not-so-useful special case.  We have freedom to do either way.  It is probably better to minimize the code complexity since distcp is already complicated enough.

> 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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