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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 17:08:07 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-6051?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12721344#action_12721344
] 

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

Currently -update writes to bar only and I think that is correct.
It copies to bar/foo only if bar is a dir and existing(similar to what happens without -update).
If "bar" doesn't exist at destination, then foo is copied to bar. If "bar" exists at destination
and is a file, it is overwritten if different from the source(this is the case overwriting
is happening again and again, though it should not).
I don't see any path difference with -update when compared to without -update in any case(whether
the destination exists or not). Am I missing any case where -update writes to a different
path when compared to without -update option ?

> 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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