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https://issues.apache.org/jira/browse/HADOOP-3913?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12621512#action_12621512
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Tsz Wo (Nicholas), SZE commented on HADOOP-3913:
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By superusers (in hadoop), I mean the user started the namenode or the users
belonging one of the groups specified in dfs.permissions.supergroup. In your
case, you are copying from a 0.18 cluster to a 0.17 cluster. Note that your
0.18 superusers and 0.17 superusers could be different.
I guess you might have used a superuser account in your 0.18 cluster to do
distcp. So the copy success even the directory is 000. I will check this.
> Distcp allows copy even if directory permissions are 000.
> ---------------------------------------------------------
>
> Key: HADOOP-3913
> URL: https://issues.apache.org/jira/browse/HADOOP-3913
> Project: Hadoop Core
> Issue Type: Bug
> Components: tools/distcp
> Affects Versions: 0.18.0
> Reporter: Suman Sehgal
>
> distcp initiated from 0.17.0 and 0.18.0 permissions turned ON, directory with
> permission 000, data gets copied from
> 0.18.0 to 0.17.0
> Data gets copied between different versions of hadoop when tried by the same
> user. It gets failed only if other
> user(other than the user who started cluster) tries to copy data using distcp.
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