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https://issues.apache.org/jira/browse/HDFS-6446?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14067847#comment-14067847
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Abhiraj Butala commented on HDFS-6446:
--------------------------------------

Hey [~yeshavora], I am not able to reproduce this issue on latest hadoop trunk. 
Following are some outputs:

{code}
abutala@abutala-vBox:/mnt/hdfs$ mount | grep hdfs
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 12M Jul 19 11:36 abc.txt
drwxr-xr-x 3 abutala supergroup  96 Jul 19 12:10 temp
abutala@abutala-vBox:/mnt/hdfs$ cp ~/work/hbase/hbase.tar.gz abc.txt
cp: cannot create regular file `abc.txt': Permission denied
abutala@abutala-vBox:/mnt/hdfs$ cat ~/work/hbase/hbase.tar.gz >> abc.txt
cat: write error: Permission denied
{code}

Am I missing anything? Or perhaps the issue got fixed recently? Let me know if 
you can still reproduce it. Thank you!

> NFS: Different error messages for appending/writing data from read only mount
> -----------------------------------------------------------------------------
>
>                 Key: HDFS-6446
>                 URL: https://issues.apache.org/jira/browse/HDFS-6446
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: nfs
>    Affects Versions: 2.2.0
>            Reporter: Yesha Vora
>
> steps:
> 1) set dfs.nfs.exports.allowed.hosts = <nfs_client> ro
> 2) Restart nfs server
> 3) Append data on file present on hdfs from read only mount point
> Append data
> {noformat}
> bash$ cat /tmp/tmp_10MB.txt >> /tmp/tmp_mnt/expected_data_stream
> cat: write error: Input/output error
> {noformat}
> 4) Write data from read only mount point
> Copy data
> {noformat}
> bash$ cp /tmp/tmp_10MB.txt /tmp/tmp_mnt/tmp/
> cp: cannot create regular file `/tmp/tmp_mnt/tmp/tmp_10MB.txt': Permission 
> denied
> {noformat}
> Both operations are treated differently. Copying data returns valid error 
> message: 'Permission denied' . Though append data does not return valid error 
> message



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