[Hadoop-common-dev] [jira] Created: (HADOOP-3078) bin/hadoop fs -chmod doesnot change execution permissions for files.

[ https://issues.apache.org/jira/browse/HADOOP-3078?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Amareshwari Sriramadasu updated HADOOP-3078:
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Component/s: dfs
Description:
bin/hadoop fs -chmod doesnt change execution permissions for files.

I have two files in scripts directory
$ hadoop fs -lsr scripts
/user/amarsri/scripts/my.pl <r 3> 146 2008-03-24 14:39 rw-r--r-- amarsri supergroup
/user/amarsri/scripts/xyz.pl <r 3> 146 2008-03-24 14:39 rw-r--r-- amarsri supergroup

When i ran -chmod 777 on the file, file has only read permissions but no execution permissions.
$ hadoop fs -chmod 777 /user/amarsri/scripts/my.pl
$ hadoop fs -lsr scripts
/user/amarsri/scripts/my.pl <r 3> 146 2008-03-24 14:39 rw-rw-rw- amarsri supergroup
/user/amarsri/scripts/xyz.pl <r 3> 146 2008-03-24 14:39 rw-r--r-- amarsri supergroup

When I do -chmod -R 777 on the directory, permissions are given to the directory, and the directories inside them, but files dont get execution permissions.
$ hadoop fs -chmod -R 777 /user/amarsri/scripts/
$ hadoop fs -lsr scripts
/user/amarsri/scripts/my.pl <r 3> 146 2008-03-24 14:39 rw-rw-rw- amarsri supergroup
/user/amarsri/scripts/xyz.pl <r 3> 146 2008-03-24 14:39 rw-rw-rw- amarsri supergroup
"$hadoop fs -ls" lists scripts as the following.
/user/amarsri/scripts <dir> 2008-03-24 14:39 rwxrwxrwx amarsri supergroup


was:

bin/hadoop fs -chmod doesnt change execution permissions for files.

I have two files in scripts directory
$ hadoop fs -lsr scripts
/user/amarsri/scripts/my.pl <r 3> 146 2008-03-24 14:39 rw-r--r-- amarsri supergroup
/user/amarsri/scripts/xyz.pl <r 3> 146 2008-03-24 14:39 rw-r--r-- amarsri supergroup

When i ran -chmod 777 on the file, file has only read permissions but no execution permissions.
$ hadoop fs -chmod 777 /user/amarsri/scripts/my.pl
$ hadoop fs -lsr scripts
/user/amarsri/scripts/my.pl <r 3> 146 2008-03-24 14:39 rw-rw-rw- amarsri supergroup
/user/amarsri/scripts/xyz.pl <r 3> 146 2008-03-24 14:39 rw-r--r-- amarsri supergroup

When I do -chmod -R 777 on the directory, permissions are given to the directory, and the directories inside them, but files dont get execution permissions.
$ hadoop fs -chmod -R 777 /user/amarsri/scripts/
$ hadoop fs -lsr scripts
/user/amarsri/scripts/my.pl <r 3> 146 2008-03-24 14:39 rw-rw-rw- amarsri supergroup
/user/amarsri/scripts/xyz.pl <r 3> 146 2008-03-24 14:39 rw-rw-rw- amarsri supergroup
"$hadoop fs -ls" lists scripts as the following.
/user/amarsri/scripts <dir> 2008-03-24 14:39 rwxrwxrwx amarsri supergroup

[ https://issues.apache.org/jira/browse/HADOOP-3078?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Robert Chansler resolved HADOOP-3078.
-------------------------------------

Resolution: Invalid

Files do not have an execute permission. (Directories _do_ have an execute permission.)
" In contrast to the POSIX model, there are no sticky, setuid
or setgid bits for files as there is no notion of executable files."

[ https://issues.apache.org/jira/browse/HADOOP-3078?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12581619#action_12581619 ]

Raghu Angadi commented on HADOOP-3078:
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At the least, it is confusing to the user. 'x' is something user sets (unlike 'd'), I wonder why it is disallowed for files in HDFS.

[ https://issues.apache.org/jira/browse/HADOOP-3078?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12581620#action_12581620 ]

Raghu Angadi commented on HADOOP-3078:
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Also, 'fs -help chmod' needs to be updated to reflect this, at the time it was written, I didn't know DFS ignores 'x' on files. My preferred fix would be not to ignore it.

[ https://issues.apache.org/jira/browse/HADOOP-3078?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12581676#action_12581676 ]

Tsz Wo (Nicholas), SZE commented on HADOOP-3078:
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[ https://issues.apache.org/jira/browse/HADOOP-3078?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12581692#action_12581692 ]

Raghu Angadi commented on HADOOP-3078:
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Well, I don't think executable is real file system property. It is a file property interpreted by the operating system (and security layer). The fact that HDFS does not need it IMHO is not a good reason to restrict the users. If there is an improvement (either internal or user facing) because of not allowing this flag I would like to know.

[ https://issues.apache.org/jira/browse/HADOOP-3078?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12581694#action_12581694 ]

Mahadev konar commented on HADOOP-3078:
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a useful example where x perms would be useful is mounting hdfs as a fuse module...

[ https://issues.apache.org/jira/browse/HADOOP-3078?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12581771#action_12581771 ]

Amareshwari Sriramadasu commented on HADOOP-3078:
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bq.Also, 'fs -help chmod' needs to be updated to reflect this, at the time it was written, I didn't know DFS ignores 'x' on files.
+1