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