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From "Xiao Chen (JIRA)" <j...@apache.org>
Subject [jira] [Resolved] (HDFS-4981) chmod 777 the .snapshot directory does not error that modification on RO snapshot is disallowed
Date Tue, 29 Sep 2015 22:42:04 GMT

     [ https://issues.apache.org/jira/browse/HDFS-4981?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Xiao Chen resolved HDFS-4981.
-----------------------------
    Resolution: Won't Fix

> chmod 777 the .snapshot directory does not error that modification on RO snapshot is
disallowed
> -----------------------------------------------------------------------------------------------
>
>                 Key: HDFS-4981
>                 URL: https://issues.apache.org/jira/browse/HDFS-4981
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: snapshots
>    Affects Versions: 3.0.0, 2.0.4-alpha
>            Reporter: Stephen Chu
>            Assignee: Xiao Chen
>            Priority: Trivial
>
> Snapshots currently are RO, so it's expected that when someone tries to modify the .snapshot
directory s/he is denied.
> However, if the user tries to chmod 777 the .snapshot directory, the operation does not
error. The user should be alerted that modifications are not allowed, even if this operation
didn't actually change anything.
> Using other modes will trigger the error, though.
> {code}
> [schu@hdfs-snapshots-1 hdfs]$ sudo -u hdfs hdfs dfs -chmod 777 /user/schu/test_dir_1/.snapshot/
> [schu@hdfs-snapshots-1 hdfs]$ sudo -u hdfs hdfs dfs -chmod 755 /user/schu/test_dir_1/.snapshot/
> chmod: changing permissions of '/user/schu/test_dir_1/.snapshot': Modification on a read-only
snapshot is disallowed
> [schu@hdfs-snapshots-1 hdfs]$ sudo -u hdfs hdfs dfs -chmod 435 /user/schu/test_dir_1/.snapshot/
> chmod: changing permissions of '/user/schu/test_dir_1/.snapshot': Modification on a read-only
snapshot is disallowed
> [schu@hdfs-snapshots-1 hdfs]$ sudo -u hdfs hdfs dfs -chown hdfs /user/schu/test_dir_1/.snapshot/
> chown: changing ownership of '/user/schu/test_dir_1/.snapshot': Modification on a read-only
snapshot is disallowed
> [schu@hdfs-snapshots-1 hdfs]$ sudo -u hdfs hdfs dfs -chown schu /user/schu/test_dir_1/.snapshot/
> chown: changing ownership of '/user/schu/test_dir_1/.snapshot': Modification on a read-only
snapshot is disallowed
> [schu@hdfs-snapshots-1 hdfs]$ 
> {code}



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