Stephen Chu created HDFS-4981:
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Summary: 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: 2.0.4-alpha, 3.0.0
Reporter: Stephen Chu
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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