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Date: Thu, 24 Apr 2008 16:23:56 -0700 (PDT)
From: "Chris K Wensel (JIRA)" <jira@apache.org>
To: hbase-dev@hadoop.apache.org
Subject: [jira] Commented: (HBASE-487) Replace hql w/ a hbase-friendly jirb
 or jython shell
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    [ https://issues.apache.org/jira/browse/HBASE-487?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12592197#action_12592197 ] 

Chris K Wensel commented on HBASE-487:
--------------------------------------

I've added a patch to groovysh to allow for scripts to register new commands.
http://jira.codehaus.org/browse/GROOVY-2778

But the argument parser leaves something to be desired, it tokenizes all the values after the command by whitespace and does not honor quotes. 

for example: cmd "foo bar"
would result in arg[0] == '"foo' and arg[1] == 'bar"'

Further I do not know if you can access shell variables from the command. Likely so, but isn't straightforward. the argument parser for sure doesn't resolve them. thus escaping shell variables into command arguments might be troublesome.

> Replace hql w/ a hbase-friendly jirb or jython shell
> ----------------------------------------------------
>
>                 Key: HBASE-487
>                 URL: https://issues.apache.org/jira/browse/HBASE-487
>             Project: Hadoop HBase
>          Issue Type: Wish
>            Reporter: stack
>            Assignee: stack
>            Priority: Minor
>             Fix For: 0.2.0
>
>         Attachments: groovy-2.patch, groovy.patch, jruby.patch
>
>
> The hbase shell is a useful admin and debugging tool but it has a couple of downsides.  To extend, a fragile parser definition needs tinkering-with and new java classes must be added.  The current test suite for hql is lacking coverage and the current code could do with a rewrite having evolved piecemeal.  Another downside is that the presence of an HQL interpreter gives the mis-impression that hbase is like a SQL database.
> This 'wish' issue suggests that we jettison HQL and instead offer users a jirb or jython command line.  We'd ship with some scripts and jruby/jython classes that we'd source on startup to do things like import base client classes -- so folks wouldn't have to remember all the packages stuff sat in -- and added a pretty-print for scanners and getters outputting text, xhtml or binary.  They would also make it easy to do HQL-things in jruby/python script.
> Advantages: Already-written parser with no need of extension probing deeper into hbase: i.e. better for debugging than HQL could ever be.  Easy extension adding scripts/modules rather than java code.  Less likely hbase could be confused for a SQL db.
> Downsides: Probably more verbose.  Requires ruby or python knowledge ("Everyone knows some sql").  Big? (jruby lib is 24M).
> I was going to write security as downside but HQL suffers this at the moment too -- though it has been possible to sort the updates from the selects in the UI to prevent modification of the db from the UI, something that would be hard to do in a jruby/jython parser.
> What do others think?

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