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From "stack (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-1375) a simple parser for hbase.
Date Thu, 14 Jun 2007 20:31:26 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-1375?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12504899
] 

stack commented on HADOOP-1375:
-------------------------------

My version of the patch, hadoop1375-v12.patch, removed parser subdir, renamed the javacc file
as HBaseShell.jj from QueryParser.jj, and output all generated classes to a subdir named 'generated'.
 These changes are not included in your latest patch.  Also there is a regression where main
class is again named HbaseShell rather than HBaseShell.

If I type in a non-command, the shell still exits:

{code}
HBase > show;
Exception in thread "main" java.lang.
Error: Missing return statement in function        
at org.apache.hadoop.hbase.shell.parser.QueryParser.parse(QueryParser.java:137)        
at org.apache.hadoop.hbase.shell.HbaseShell.main(HbaseShell.java:65)
{code}

Can you catch these exceptions and instead output a nice message, something like 'Unknown
command: Type 'help' for usage' or some such thing?

The 'show' command does not seem to always work.  E.g. type 'show scan;'.

I tried to use the scan command on the root table and got an exception: Type 'scan --ROOT--;'.

> a simple parser for hbase.
> --------------------------
>
>                 Key: HADOOP-1375
>                 URL: https://issues.apache.org/jira/browse/HADOOP-1375
>             Project: Hadoop
>          Issue Type: Improvement
>          Components: contrib/hbase
>         Environment: All environments 
>            Reporter: udanax
>            Priority: Minor
>         Attachments: hadoop1375-v12.patch, jline-0.9.91.jar, patch.txt, patch.txt, patch.txt,
patch.txt, patch.txt, patch.txt, patch.txt, patch.txt, patch.txt
>
>
> http://wiki.apache.org/lucene-hadoop/HbaseShell (work in progress)
> HBase Shell is developed to achieve the following goals. 
>  * Generic Monitoring Function 
>  * A Simplified Import/Export/Migrate Functionality Between different data sources (Hadoop,
HBase) 
>  * A Simplified processing of a logical data model 
>  * A Simplified algebraic operations 
>    (Parallel Numerical Analysis by abstracting/numericalizing points, lines, or plane
data across multiple maps in HBase.)
> {code}
> [# root@localhost] ./bin/hadoop jar ./build/hadoop-hbase org.apache.hadoop.hbase.shell.HbaseShell
> Hbase > help;
> blah blah...
> Hbase > create webtable 
>      --> columnfamilies('anchors', 'language') limit=3;
> Hbase > set webtable values('anchors:http://www.udanax.org/','opensource') where row="http://www.hadoop.co.kr";
> Hbase > scan webtable where row="http://www.hadoop.co.kr";
> blah blah...
> Hbase > set webtable values('language:kr','euc-kr') where row="http://www.hadoop.co.kr";
> Hbase > scan webtable where row="http://www.hadoop.co.kr" and column="language:kr";
> blah blah...
> Hbase > scan webtable;
> Hbase > exit
> [# root@localhost] 
> {code}

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