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