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From "stack (JIRA)" <j...@apache.org>
Subject [jira] Created: (HBASE-487) Replace hql w/ a hbase-friendly jirb or jython shell
Date Mon, 03 Mar 2008 19:14:50 GMT
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
            Priority: Minor


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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