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