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https://issues.apache.org/jira/browse/HDFS-4139?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13495760#comment-13495760
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Eli Collins commented on HDFS-4139:
-----------------------------------
That's options#read_only, not dfs_context#read_only. I'm pretty sure the latter
is dead code.
> fuse-dfs RO mode still allows file truncation
> ---------------------------------------------
>
> Key: HDFS-4139
> URL: https://issues.apache.org/jira/browse/HDFS-4139
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: fuse-dfs
> Affects Versions: 2.0.2-alpha
> Reporter: Andy Isaacson
> Assignee: Colin Patrick McCabe
> Attachments: HDFS-4139.001.patch
>
>
> Mounting a fuse-dfs in readonly mode with "-oro" still allows the user to
> truncate files.
> {noformat}
> $ grep fuse /etc/fstab
> hadoop-fuse-dfs#dfs://ubu-cdh-0.local /export/hdfs fuse noauto,ro 0 0
> $ sudo mount /export/hdfs
> $ hdfs dfs -ls /tmp
> ...
> -rw-r--r-- 3 ubuntu hadoop 4 2012-11-01 14:18 /tmp/blah.txt
> $ echo foo > /export/hdfs/tmp/blah.txt
> -bash: /export/hdfs/tmp/blah.txt: Permission denied
> $ hdfs dfs -ls /tmp
> ...
> -rw-r--r-- 3 ubuntu hadoop 0 2012-11-01 14:28 /tmp/blah.txt
> $ ps ax | grep dfs
> ...
> 13639 ? Ssl 0:02 /usr/lib/hadoop/bin/fuse_dfs dfs://ubu-cdh-0.local
> /export/hdfs -o ro,dev,suid
> {noformat}
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