[jira] [Commented] (HDFS-9123) Copying from the root to a subdirectory should be forbidden

["Wei-Chiu Chuang (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HDFS-9123?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14904595#comment-14904595 ] 

Wei-Chiu Chuang commented on HDFS-9123:
---------------------------------------

However, the fact that the source path is the root, does not imply the destination path must be its sub-directory. Correct? I mean they do not necessarily belong to the same file system.

> 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 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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