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A fully-functional but simple way to deal with replicated databases in Rails

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master_slave_adapter

Quick setup

Just use 'master_slave_adapter' in your database.yml:

production:
  adapter: master_slave_adapter
  real_adapter: mysql
  master:
    database: app_production
    username: rails
    password: ********
    host: masterdb.example.com
  slave:
    database: app_production
    username: rails
    password: ********
    host: slavedb.example.com
  • No matter what, all "write" calls go to the master.
  • Inside transactions, all calls go to the master.
  • Inside Observers, all calls go to the master.

By default, all other "read" calls will go to the slave, unless you add "default: master" to the options in database.yml.

If you want to control when the slave is used, you can specify which server you want to use (for the 'read' calls) by using:

TheModel.with_master do ... end

TheModel.with_slave do ... end

Credits

A lot of inspiration and understanding of the problem came from Rick Olsen's Masochism.


Copyright (c) 2009 Sebastian Delmont sd@notso.net Copyright (c) 2009, 2008 StreetEasy / NMD Interactive http://www.streeteasy.com/ All rights reserved.

Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met:

  • Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer.

  • Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution.

  • Neither the name of Sebastian Delmont, nor StreetEasy nor NMD Interactive nor the names of their contributors may be used to endorse or promote products derived from this software without specific prior written permission.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS

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