Comments on: Mysql Replication Adapter http://blog.rapleaf.com/dev/2007/08/12/mysql-replication-adapter/ For engineers, by engineers. Mon, 07 May 2012 08:24:59 +0000 hourly 1 By: Joni http://blog.rapleaf.com/dev/2007/08/12/mysql-replication-adapter/#comment-5233 Joni Thu, 28 Apr 2011 16:16:54 +0000 http://blog.rapleaf.com/dev/?p=5#comment-5233 Thanks alot - your answer solved all my plrobmes after several days struggling Thanks alot – your answer solved all my plrobmes after several days struggling

]]> By: chris http://blog.rapleaf.com/dev/2007/08/12/mysql-replication-adapter/#comment-262 chris Wed, 30 Dec 2009 02:17:32 +0000 http://blog.rapleaf.com/dev/?p=5#comment-262 FYI: We recently made the switch to mysql_proxy, and that helped a lot to automatically direct reads/writes to the appropriate database. However, race conditions can occur if master-to-slave replication takes too long and you SELECT a recently inserted value. So I wrote a Rails DB adapter to allowing overriding mysql_proxy by directing queries to named databases, as in: User.first(:use_db => :master) The adapter, mysql_proxy_adapter, can be found here: http://github.com/findchris/mysql_proxy_adapter/ -Chris (@findchris) FYI: We recently made the switch to mysql_proxy, and that helped a lot to automatically direct reads/writes to the appropriate database.

However, race conditions can occur if master-to-slave replication takes too long and you SELECT a recently inserted value. So I wrote a Rails DB adapter to allowing overriding mysql_proxy by directing queries to named databases, as in: User.first(:use_db => :master)

The adapter, mysql_proxy_adapter, can be found here:
http://github.com/findchris/mysql_proxy_adapter/

-Chris
(@findchris)

]]> By: bryan http://blog.rapleaf.com/dev/2007/08/12/mysql-replication-adapter/#comment-252 bryan Thu, 19 Nov 2009 01:00:24 +0000 http://blog.rapleaf.com/dev/?p=5#comment-252 You got it. Each subsection should be an independent DB config section. You got it. Each subsection should be an independent DB config section.

]]> By: edevre http://blog.rapleaf.com/dev/2007/08/12/mysql-replication-adapter/#comment-242 edevre Thu, 19 Nov 2009 00:55:01 +0000 http://blog.rapleaf.com/dev/?p=5#comment-242 How do you set a different name of the database for the slave, do you just add another line database: slavedbname, after the slave decleration? Thanks in advance How do you set a different name of the database for the slave, do you just add another line database: slavedbname, after the slave decleration?

Thanks in advance

]]> By: Xavier Q. http://blog.rapleaf.com/dev/2007/08/12/mysql-replication-adapter/#comment-232 Xavier Q. Sun, 30 Aug 2009 20:51:14 +0000 http://blog.rapleaf.com/dev/?p=5#comment-232 Nice write up...usually I never reply to these thing but this time I will,Thanks for the great info. Nice write up…usually I never reply to these thing but this time I will,Thanks for the great info.

]]> By: FoundChris » Blog Archive » Rails plugin mysql_replication_adapter for Rails 2.2+ http://blog.rapleaf.com/dev/2007/08/12/mysql-replication-adapter/#comment-222 FoundChris » Blog Archive » Rails plugin mysql_replication_adapter for Rails 2.2+ Fri, 13 Feb 2009 03:20:58 +0000 http://blog.rapleaf.com/dev/?p=5#comment-222 [...] original mysql_replication_adapter was first made available by RapLeaf.  It was a gem that was released in mid-2007 and hosted on [...] [...] original mysql_replication_adapter was first made available by RapLeaf.  It was a gem that was released in mid-2007 and hosted on [...]

]]> By: findchris http://blog.rapleaf.com/dev/2007/08/12/mysql-replication-adapter/#comment-212 findchris Fri, 13 Feb 2009 02:00:37 +0000 http://blog.rapleaf.com/dev/?p=5#comment-212 FYI, I took this gem and updated it so that it's compatible with Rails 2.2.2 (as a plugin). You can find it here: http://github.com/findchris/mysql_replication_adapter/tree/master -Chris FYI, I took this gem and updated it so that it’s compatible with Rails 2.2.2 (as a plugin).

You can find it here:
http://github.com/findchris/mysql_replication_adapter/tree/master

-Chris

]]> By: chris http://blog.rapleaf.com/dev/2007/08/12/mysql-replication-adapter/#comment-202 chris Tue, 09 Sep 2008 23:52:38 +0000 http://blog.rapleaf.com/dev/?p=5#comment-202 any updates to the gem to get it working with Rails 2+? thanks! any updates to the gem to get it working with Rails 2+?

thanks!

]]> By: Josh Martin http://blog.rapleaf.com/dev/2007/08/12/mysql-replication-adapter/#comment-192 Josh Martin Tue, 27 May 2008 18:42:56 +0000 http://blog.rapleaf.com/dev/?p=5#comment-192 I recently found this rewrite (as a plugin) that works with 2.0.2 http://rubyforge.org/tracker/index.php?func=detail&aid=20068&group_id=4116&atid=15778 I recently found this rewrite (as a plugin) that works with 2.0.2

http://rubyforge.org/tracker/index.php?func=detail&aid=20068&group_id=4116&atid=15778

]]> By: Eunha http://blog.rapleaf.com/dev/2007/08/12/mysql-replication-adapter/#comment-182 Eunha Tue, 27 May 2008 07:36:54 +0000 http://blog.rapleaf.com/dev/?p=5#comment-182 I have problem with setting this adapter. Currently I am developing in windowXP using rails2.0.2. After I add require line in my environment.rb and restart my server, I got All this message. Exiting c:/ruby/lib/ruby/gems/1.8/gems/activesupport-2.0.2/lib/active_support/dependencies.rb:266:in `load_missing_constant': uninitialized constant RAILS_CONNECTION_ADAPTERS (NameError) from c:/ruby/lib/ruby/gems/1.8/gems/activesupport-2.0.2/lib/active_support/dependencies.rb:453:in `const_missing' from c:/ruby/lib/ruby/gems/1.8/gems/activesupport-2.0.2/lib/active_support/dependencies.rb:465:in `const_missing' from c:/ruby/lib/ruby/gems/1.8/gems/mysql_replication_adapter-0.4.0/lib/mysql_replication_adapter.rb:8 from c:/ruby/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:32:in `gem_original_require' from c:/ruby/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:32:in `require' from c:/ruby/lib/ruby/gems/1.8/gems/activesupport-2.0.2/lib/active_support/dependencies.rb:496:in `require' from c:/ruby/lib/ruby/gems/1.8/gems/activesupport-2.0.2/lib/active_support/dependencies.rb:342:in `new_constants_in' from c:/ruby/lib/ruby/gems/1.8/gems/activesupport-2.0.2/lib/active_support/dependencies.rb:496:in `require' ... 29 levels... from c:/ruby/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:27:in `require' from ./script/server:3 from -e:2:in `load' from -e:2 Do you have any idea what's wrong with my setting ? I have problem with setting this adapter.
Currently I am developing in windowXP using rails2.0.2. After I add require line in my environment.rb and restart my server, I got All this message.

Exiting
c:/ruby/lib/ruby/gems/1.8/gems/activesupport-2.0.2/lib/active_support/dependencies.rb:266:in `load_missing_constant’: uninitialized constant RAILS_CONNECTION_ADAPTERS (NameError)
from c:/ruby/lib/ruby/gems/1.8/gems/activesupport-2.0.2/lib/active_support/dependencies.rb:453:in `const_missing’
from c:/ruby/lib/ruby/gems/1.8/gems/activesupport-2.0.2/lib/active_support/dependencies.rb:465:in `const_missing’
from c:/ruby/lib/ruby/gems/1.8/gems/mysql_replication_adapter-0.4.0/lib/mysql_replication_adapter.rb:8
from c:/ruby/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:32:in `gem_original_require’
from c:/ruby/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:32:in `require’
from c:/ruby/lib/ruby/gems/1.8/gems/activesupport-2.0.2/lib/active_support/dependencies.rb:496:in `require’
from c:/ruby/lib/ruby/gems/1.8/gems/activesupport-2.0.2/lib/active_support/dependencies.rb:342:in `new_constants_in’
from c:/ruby/lib/ruby/gems/1.8/gems/activesupport-2.0.2/lib/active_support/dependencies.rb:496:in `require’
… 29 levels…
from c:/ruby/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:27:in `require’
from ./script/server:3
from -e:2:in `load’
from -e:2

Do you have any idea what’s wrong with my setting ?

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