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https://issues.apache.org/jira/browse/HDFS-6703?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14066586#comment-14066586
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Abhiraj Butala commented on HDFS-6703:
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Sure [~usrikanth]! Feel free to submit a patch when you are ready. The fix
should be on similar lines to what you have proposed.
> NFS: Files can be deleted from a read-only mount
> ------------------------------------------------
>
> Key: HDFS-6703
> URL: https://issues.apache.org/jira/browse/HDFS-6703
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: nfs
> Reporter: Abhiraj Butala
> Assignee: Srikanth Upputuri
>
>
> As reported by bigdatagroup <bigdatagr...@itecons.it> on hadoop-users mailing
> list:
> {code}
> We exported our distributed filesystem with the following configuration
> (Managed by Cloudera Manager over CDH 5.0.1):
> <property>
> <name>dfs.nfs.exports.allowed.hosts</name>
> <value>192.168.0.153 ro</value>
> </property>
> As you can see, we expect the exported FS to be read-only, but in fact we are
> able to delete files and folders stored on it (where the user has the correct
> permissions), from the client machine that mounted the FS.
> Other writing operations are correctly blocked.
> Hadoop Version in use: 2.3.0+cdh5.0.1+567"
> {code}
> I was able to reproduce the issue on latest hadoop trunk. Though I could only
> delete files, deleting directories were correctly blocked:
> {code}
> abutala@abutala-vBox:/mnt/hdfs$ mount | grep 127
> 127.0.1.1:/ on /mnt/hdfs type nfs (rw,vers=3,proto=tcp,nolock,addr=127.0.1.1)
> abutala@abutala-vBox:/mnt/hdfs$ ls -lh
> total 512
> -rw-r--r-- 1 abutala supergroup 0 Jul 17 18:51 abc.txt
> drwxr-xr-x 2 abutala supergroup 64 Jul 17 18:31 temp
> abutala@abutala-vBox:/mnt/hdfs$ rm abc.txt
> abutala@abutala-vBox:/mnt/hdfs$ ls
> temp
> abutala@abutala-vBox:/mnt/hdfs$ rm -r temp
> rm: cannot remove `temp': Permission denied
> abutala@abutala-vBox:/mnt/hdfs$ ls
> temp
> abutala@abutala-vBox:/mnt/hdfs$
> {code}
> Contents of hdfs-site.xml:
> {code}
> <configuration>
> <property>
> <name>dfs.nfs3.dump.dir</name>
> <value>/tmp/.hdfs-nfs3</value>
> </property>
> <property>
> <name>dfs.nfs.exports.allowed.hosts</name>
> <value>localhost ro</value>
> </property>
> </configuration>
> {code}
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