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https://issues.apache.org/jira/browse/HDFS-9123?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14904925#comment-14904925
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Mingliang Liu commented on HDFS-9123:
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The patch looks good to me.
> Copying from the root to a subdirectory should be forbidden
> -----------------------------------------------------------
>
> Key: HDFS-9123
> URL: https://issues.apache.org/jira/browse/HDFS-9123
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: fs
> Reporter: Wei-Chiu Chuang
> Assignee: Wei-Chiu Chuang
> Priority: Minor
> Attachments: HDFS-9123.001.patch, HDFS-9123.002.patch,
> HDFS-9123.003.patch
>
>
> HDFS forbids copying from a directory to its subdirectory (e.g. hdfs dfs -cp
> /abc /abc/xyz) as otherwise it could cause infinite copying (/abc/xyz/xyz,
> /abc/xyz/xyz, /abc/xyz/xyz/xyz,... etc)
> However, the existing path validation fails if the source path is the root,
> causing infinite copying, until the disk space is filled up.
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