A Ruby client for HBase (http://hadoop.apache.org/hbase) that works with the Stargate interface.
Stargate is the RESTful web service front end for HBase that can serve up a number of formats including XML, JSON, and protobufs.
This project is based off the work of Dingding Ye <yedingding@gmail.com> at http://github.com/sishen/hbase-ruby
$ gem install hbase-stargate -s http://gemcutter.org
To work with this gem in your Rails application, add this to the environment.rb file:
config.gem 'hbase-stargate', :lib => "stargate", :source => "http://gemcutter.org"To build the gem yourself:
$ rake build- Download and unpack the most recent release of HBase from http://hadoop.apache.org/hbase/releases.html#Download
- Edit /conf/hbase-env.sh and uncomment/modify the following line to correspond to your Java home path:
export JAVA_HOME=/usr/lib/jvm/java-6-sun - Copy /contrib/stargate/hbase--stargate.jar into /lib
- Copy all the files in the /contrib/stargate/lib folder into /lib
- Start up HBase:
$ /bin/start-hbase.sh - Start up Stargate (append “-p 1234” at the end if you want to change the port):
$ /bin/hbase org.apache.hadoop.hbase.stargate.Main
Here are some examples:
require 'stargate'
# Direct connection
# client = Stargate::Client.new("http://localhost:8080") # this url is the default for stargate.
# Connection through a proxy
client = Stargate::Client.new("http://localhost:8080", { :proxy => "10.2.3.4:8080" })
# Table Operation
tables = client.list_tables # list available tables
table = client.create_table('users', 'habbit') # create a table whose column_family is habbit
table = client.show_table('users') # show the meta info of table users
client.delete_table('users') # delete 'users' table
# Row Operation
row = client.show_row('users', 'sishen') # show the data of row 'sishen' in table 'users'
row2 = client.create_row('users', 'sishen', Time.now.to_i, {:name => 'habbit:football', :value => 'i like football'}) # create the row 'sishen' with the data in the table 'users'
client.delete_row('users', 'sishen', nil, 'habbit:football') # delete the row 'sishen' of table 'users' with the optional column 'habbit:football'
# Scanner Operation (see spec/stargate-client/operation/scanner_operation_spec.rb for more examples)
scanner = client.open_scanner('users', {:start_row => "row2", :batch => 5, :columns => ["habbit:"]}) # See more options from Stargate::Model::Scanner.AVAILABLE_OPTS
rows = client.get_rows(scanner)
client.close_scanner(scanner)
Run the specs with the following rake task:
$ rake spec
or pass it the URL to the HBase Stargate server as an argument:
$ rake spec STARGATE_URL=http://localhost:8080
Copyright © 2008 Openplaces.org
Distributed under MIT License