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https://issues.apache.org/jira/browse/HADOOP-18117?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17573208#comment-17573208
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Ayush Saxena commented on HADOOP-18117:
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The name of the option isn't at all indicative of what it does. updateRoot is
like what it is doing with the / directory of the FileSystem. And the
description also says "Update root directory attributes", by code it seems kind
of sync or preserve and use of root also seems to indicate towards root of the
FileSystem in general
> Add an option to preserve root directory permissions
> ----------------------------------------------------
>
> Key: HADOOP-18117
> URL: https://issues.apache.org/jira/browse/HADOOP-18117
> Project: Hadoop Common
> Issue Type: Improvement
> Reporter: Mohanad Elsafty
> Assignee: Mohanad Elsafty
> Priority: Minor
> Labels: pull-request-available
> Fix For: 3.4.0
>
> Time Spent: 3h
> Remaining Estimate: 0h
>
> As mentioned in https://issues.apache.org/jira/browse/HADOOP-15211
>
> If *-update* or *-overwrite* is being passed when *distcp* used, the root
> directory will be skipped in two occasions (CopyListing#doBuildListing &
> CopyCommitter#preserveFileAttributesForDirectories), which will ignore root
> directory's attributes.
>
> We face the same issue when distcp huge data between clusters and it takes
> too much effort to update root directories attributes manually.
>
> From the earlier ticket it's obvious why this behaviour is there, but
> sometime we need to enforce root directory update hence I will add a new
> option for distcp to enable someone (who understands the need of this and
> know what they are doing) to enforce the update of root directory's
> attributes (permissions, ownership, ...)
>
> It should be simple one, something like this
> {code:java}
> $ hadoop distcp -p -update -updateRootDirectoryAttributes /a/b/c /a/b/d {code}
> This behaviour is optional and will be *false* by default. (it should not
> affect existing *distcp* users).
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