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