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Posted to mapreduce-issues@hadoop.apache.org by "Ravi Gummadi (JIRA)" <ji...@apache.org> on 2009/09/08 17:49:57 UTC
[jira] Commented: (MAPREDUCE-644) distcp does not skip copying file
if we are updating single file
[ https://issues.apache.org/jira/browse/MAPREDUCE-644?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12752582#action_12752582 ]
Ravi Gummadi commented on MAPREDUCE-644:
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I tested it manually and I see that the single file's copy is skipped only with the patch.
Am wondering if we can verify the count of files copied(there is a counter 'COPY' in distcp for this) from testcase after running distcp for a single file with -update option and the destination contains the file already.
Thoughts ?
> 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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