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https://issues.apache.org/jira/browse/HADOOP-6051?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12721356#action_12721356
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Ravi Gummadi commented on HADOOP-6051:
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I just saw that the doc says something different from what I understood. But
distcp -update works as I mentioned only. I rechecked now after looking at the
doc.
For the case of distcp -update foo/a foo/b bar mentioned in
the doc, the effect of the command is creating bar/a/aa bar/a/ab
bar/b/ba abd bar/b/bb.
I guess we need to change the doc. OR Do we really need to change the behaviour
of distcp ?
> 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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