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From "jiraposter@reviews.apache.org (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-5548) Add ability to get a table in the shell
Date Fri, 06 Apr 2012 05:19:18 GMT

    [ https://issues.apache.org/jira/browse/HBASE-5548?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13248070#comment-13248070

jiraposter@reviews.apache.org commented on HBASE-5548:

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Review request for hbase and Michael Stack.


Adding the ability to get a reference to a table in the shell. 

Previously, all commands that acted on a table would need to take the name of the table as
a string, which is annoying in an OO REPL. This patch introduces the ability to get and hold
a  reference to a table both on creation (via create(...)) and at will (via get_table(...)).

Further, to actually make the table useful, modifications to table specific class were made
so you can have a reference and just do things like put, scan, get, etc. on that table reference.
To accommodate new table functionality, table specific methods are easily added (one line)
in a dynamic fashion via class methods in the Table. See examples in get, put, scan, etc..

There is also a lot of admin functionality tied to a table - things like disabling, dropping,
describing, etc - that were added to the table class. Now you can do things like 'table.disable'
and 'table.describe'. Again these were dynamically added, so new admin functionality for a
table is as simple as adding the method name to one line in the Table class.  

This addresses bug HBASE-5548.


  src/main/ruby/hbase/hbase.rb 2c37840 
  src/main/ruby/hbase/table.rb 41dcf21 
  src/main/ruby/shell.rb 53f3de8 
  src/main/ruby/shell/commands.rb af6df33 
  src/main/ruby/shell/commands/count.rb 6596441 
  src/main/ruby/shell/commands/create.rb 14c1b0f 
  src/main/ruby/shell/commands/delete.rb 12bc405 
  src/main/ruby/shell/commands/deleteall.rb 5731b60 
  src/main/ruby/shell/commands/get.rb 754c3d6 
  src/main/ruby/shell/commands/get_counter.rb 3cbe226 
  src/main/ruby/shell/commands/get_table.rb PRE-CREATION 
  src/main/ruby/shell/commands/incr.rb 38a2fc5 
  src/main/ruby/shell/commands/put.rb dde0433 
  src/main/ruby/shell/commands/scan.rb e58aaac 
  src/main/ruby/shell/commands/table_help.rb PRE-CREATION 
  src/test/ruby/hbase/admin_test.rb 0c2672b 

Diff: https://reviews.apache.org/r/4668/diff


Manual and basic unit tests.



> Add ability to get a table in the shell
> ---------------------------------------
>                 Key: HBASE-5548
>                 URL: https://issues.apache.org/jira/browse/HBASE-5548
>             Project: HBase
>          Issue Type: Improvement
>          Components: shell
>            Reporter: Jesse Yates
>            Assignee: Jesse Yates
>             Fix For: 0.96.0, 0.94.1
>         Attachments: ruby_HBASE-5528-v0.patch, ruby_HBASE-5548-v1.patch, ruby_HBASE-5548-v2.patch,
> Currently, all the commands that operate on a table in the shell first have to take the
table as name as input. 
> There are two main considerations:
> * It is annoying to have to write the table name every time, when you should just be
able to get a reference to a table
> * the current implementation is very wasteful - it creates a new HTable for each call
(but reuses the connection since it uses the same configuration)
> We should be able to get a handle to a single HTable and then operate on that.

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