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From "lohit vijayarenu (JIRA)" <j...@apache.org>
Subject [jira] Updated: (HADOOP-2190) dfs ls and lsr commands differ from POSIX standards
Date Fri, 16 Nov 2007 00:05:43 GMT

     [ https://issues.apache.org/jira/browse/HADOOP-2190?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

lohit vijayarenu updated HADOOP-2190:
-------------------------------------

    Attachment: HADOOP-2190-1.patch

Attached  patch throws out error for ls, lsr, du, dus commands for non-existing files. There
were 2 changes DistributedFileSyste.listPaths() was not returning null for non-existing files
and  FileSystem.listPaths() was consuming null returned from underlying listPaths and returning
zero length Path[] array. So, I have made changes at few places so that listPaths returns
null when required. I ran the tests and they look good. If anyone could take a look at the
changes and approve it, I will prepare test cases and update another patch. The issue reported
was also seen on local filesystem. fixing the second issue also takes care of local filesystem.

Below is the output after the patch
{noformat}
ls/lsr command 
[ hadoop-trunk]$ hadoop dfs -ls empty
Found 0 items
[ hadoop-trunk]$ hadoop dfs -ls nofile
ls: Could not get listing for nofile
[ hadoop-trunk]$ hadoop dfs -lsr nofile
lsr: Could not get listing for nofile

du command
[ hadoop-trunk]$ hadoop dfs -du empty
Found 0 items
[ hadoop-trunk]$ hadoop dfs -du nofile
du: Could not get listing for nofile

[ hadoop-trunk]$ hadoop dfs -dus empty
empty   0
[ hadoop-trunk]$ hadoop dfs -dus nofile
dus: dus: No match: nofile
[ hadoop-trunk]$
{noformat}

> dfs ls and lsr commands differ from POSIX standards
> ---------------------------------------------------
>
>                 Key: HADOOP-2190
>                 URL: https://issues.apache.org/jira/browse/HADOOP-2190
>             Project: Hadoop
>          Issue Type: Bug
>          Components: dfs
>    Affects Versions: 0.15.1, 0.16.0
>            Reporter: Mukund Madhugiri
>             Fix For: 0.16.0
>
>         Attachments: HADOOP-2190-1.patch
>
>
> Assuming the dfs commands follow POSIX standards, there are some problems with the DFS
ls  and lsr commands. I compared the DFS output with that of RHEL 4u5
> 1. ls a directory when there are no files/directories in that directory:
> Linux: No output
> DFS: Found 0 items
> 2. ls a file/directory that does not exist:
> Linux: ls: /doesnotexist: No such file or directory
> DFS: Found 0 items
> 3. lsr a directory that does not exist:
> Linux: ls: /doesnotexist: No such file or directory
> DFS: No output

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