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Date: Wed, 6 Apr 2011 23:38:05 +0000 (UTC)
From: "Todd Lipcon (JIRA)" <jira@apache.org>
To: common-issues@hadoop.apache.org
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Subject: [jira] [Commented] (HADOOP-6541) An Interactive Hadoop FS shell
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    [ https://issues.apache.org/jira/browse/HADOOP-6541?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13016611#comment-13016611 ] 

Todd Lipcon commented on HADOOP-6541:
-------------------------------------

Here are some comments from the user perspective (didn't look at code yet)

- should have some kind of help command - either "help", or "?"
- I think "hadoop fs -shell" makes more sense than "hadoop shell", since this is specifically for interacting with filesystems
- The following command threw a RuntimeException and exited:
{code}
hadoop> cd hdfs://monster01.sf.cloudera.com:8020
org.apache.hadoop.HadoopIllegalArgumentException: Unsupported name: has scheme but relative path-part
        at org.apache.hadoop.fs.FileContext.checkNotSchemeWithRelative(FileContext.java:264)
        at org.apache.hadoop.fs.FileContext.setWorkingDirectory(FileContext.java:458)
        at org.apache.hadoop.shell.CmdShell.cd(CmdShell.java:446)
        at org.apache.hadoop.shell.CmdShell.interpretCmd(CmdShell.java:693)
{code}

- IOExceptions shouldn't include their full backtrace unless we're in debug mode. EG "rmr asdfasdf" currently shows the full stack trace instead of just the simple error message.
- "cd" without a path goes to the home directory, which seems right. But, if the home directory doesn't exist, it seems to go to "/" which is unexpected behavior. I would expect a FileNotFoundException
- "chmod", "chown" and "chgrp", "count", and "du" don't seem to be found
- every command I type, it seems to echo the command back to me

Future enhancements to do as some other JIRA:
- "lcd", "lpwd" would be useful.
- a "head" command would be very useful
- "cd -" like in bash would be cool
- showing the cwd in the prompt would be handy
- tab completion would be handy


> An Interactive Hadoop FS shell
> ------------------------------
>
>                 Key: HADOOP-6541
>                 URL: https://issues.apache.org/jira/browse/HADOOP-6541
>             Project: Hadoop Common
>          Issue Type: New Feature
>            Reporter: Aaron Kimball
>            Assignee: Aaron Kimball
>         Attachments: HADOOP-6541.2.patch, HADOOP-6541.3.patch, HADOOP-6541.4.patch, HADOOP-6541.5.patch, HADOOP-6541.6.patch, HADOOP-6541.patch
>
>
> A shell that allows the user to execute multiple filesystem operations in a single JVM instance at a prompt.

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