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https://issues.apache.org/jira/browse/MAPREDUCE-648?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12754221#action_12754221
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Tsz Wo (Nicholas), SZE commented on MAPREDUCE-648:
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Hi Ravi, the patch cannot be applied to trunk.
> distcp -update launches job when there is at least one dir in source paths to
> be copied, even though there is nothing to copy
> -----------------------------------------------------------------------------------------------------------------------------
>
> Key: MAPREDUCE-648
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-648
> Project: Hadoop Map/Reduce
> Issue Type: Bug
> Components: distcp
> Reporter: Ravi Gummadi
> Assignee: Ravi Gummadi
> Priority: Minor
> Attachments: d_dirCount648.patch, d_dirCount_648.patch
>
>
> distcp -update launches job when there is at least one dir in source paths to
> be copied, even though there is nothing to copy.
> HADOOP-5675 added fileCount > 0 to be checked to decide whether to launch
> job. And HADOOP-5762 changed this to fileCount + dirCount > 0 to solve the
> issue of empty directories not getting copied to destination. With -update,
> dirCount is incremented without checking if that dir already exists at the
> destination. So distcp job is launched because of dirCount > 0 even though
> there is nothing to copy. Incrementing dirCount can be skipped if that dir
> already exists at the destination in case of -update.
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