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Displaying posts with tag: ruby (reset)
ruby mysql2 gem and MySQL 5.5 client library failure

My team was provisioning a ruby on rails application on a new Operating System with different ruby and client libraries and we came across a strange bug.

Intermittently we were seeing the failures in the application with the following messages in the passenger log:

NoMethodError: undefined method `each' for nil:NilClass


and

(NoMethodError) "undefined method `each' for nil:NilClass"

/usr/local/rvm/gems/ruby-1.9.2-p0/ruby/1.9.1/gems/mysql2-0.2.4/lib/active_record/connection_adapters/mysql2_adapter.rb:628:in `select'
/usr/local/rvm/gems/ruby-1.9.2-p0/ruby/1.9.1/gems/activerecord-3.0.0/lib/active_record/connection_adapters/abstract/database_statements.rb:7:in `select_all'
/usr/local/rvm/gems/ruby-1.9.2-p0/ruby/1.9.1/gems/activerecord-3.0.0/lib/active_record/connection_adapters/abstract/query_cache.rb:54:in `block in select_all' …
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DbCharmer 1.7.0 Release: Rails 3.0 Support and Forced Slave Reads

This week, after 3 months in the works, we’ve finally released version 1.7.0 of DbCharmer ruby gem – Rails plugin that significantly extends ActiveRecord’s ability to work with multiple databases and/or database servers by adding features like multiple databases support, master/slave topologies support, sharding, etc.

New features in this release:

  • Rails 3.0 support. We’ve worked really hard to bring all the features we supported in Rails 2.X to the new version of Rails and now I’m proud that we’ve implemented them all and the implementation looks much cleaner and more universal (all kinds of relations in rails 3 work in exactly the same way and we do not need to implement connection switching for all kinds of weird corner-cases in ActiveRecord).
  • Forced Slave Reads functionality. Now …
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On Password Strength

XKCD (as usual) makes a very good point – this time about password strength, and I reckon it’s something app developers need to consider urgently. Geeks can debate the exact amount of entropy, but that’s not really the issue: insisting on mixed upper/lower and/or non-alpha and/or numerical components to a user password does not really improve security, and definitely makes life more difficult for users.

So basically, the functions that do a “is this a strong password” should seriously reconsider their approach, particularly if they’re used to have the app decide whether to accept the password as “good enough” at all.

Update: Jeff Preshing has written an xkcd password generator. Users probably should choose their own four …

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Vagrant & Rubylibs

I was testing some MySQL puppet modules on my Vagrant box earlier this week and one of them required augeas.
I kept running into "Could not find a default provider for augeas", however all the appropriate augeas , augeas-lib and ruby-augeas packages were installed. I inspected the different ruby directories and the files were perfectly in /usr/lib/ruby/site_ruby/1.8 where I expected them.

With all the files seemd to be in the right place, my next option was to strace a small ruby script that included augeas, guess what that showed ..

  1. stat64("/opt/ruby/lib/ruby/site_ruby/1.8/augeas.rb", 0xbfd2af1c) = -1 ENOENT (No such file or directory)
  2. stat64("/opt/ruby/lib/ruby/site_ruby/1.8/augeas.so", 0xbfd2af1c) = -1 ENOENT (No such file or directory)
  3. stat64("/opt/ruby/lib/ruby/site_ruby/1.8/i686-linux/augeas.rb", 0xbfd2af1c) = -1 ENOENT (No such file or directory)
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New Ruby Conference: Ruby on Ales 2011

This looks like fun: Ruby on Ales. It’s March 24-25, 2011 in Bend Oregon (USA), and the tag line is Ruby, snow, and beer. Does it get any better than this?

Related posts:

  1. My sessions at the O’Reilly MySQL Conference 2011
  2. O’Reilly MySQL 2011 conference CfP is open
  3. Controlling Maatkit from Ruby
  4. Postgres folks, consider the 2011 MySQL conference
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Open source in the clouds and in the debates

We continue to see more evidence of the themes we discuss in our latest CAOS special report, Seeding the Clouds, which examines the open source software used in cloud computing, the vendors backing open source, the cloud providers using it and the impact on the industry.

First, as usual, we are seeing consistencies between our own research — which indicates open source is a huge part of today’s cloud computing offerings from major providers like Amazon, Google, Rackspace, Terremark and VMware — and that of code analysis and management vendor Black Duck. In its analysis of code that runs the cloud, Black Duck also found a preponderance of open source pieces, in many cases the same projects we profile in our report.

Indeed, open source software is an important part of the infrastructure, …

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Speaking at NovaRUG on Thursday

I’ll be joining the NovaRUG (Northern Virginia Ruby Users’ Group) on Thursday to talk about MySQL performance. See their blog for the details and how to RSVP.

Related posts:

  1. Free webinar on MySQL performance this Thursday
  2. Speaking at MySQL Meetup in Northern Virginia
  3. Speaking at EdUI Conference 2009
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Ever tried calling a win32ole (COM) object from Ruby’s DRb?


Before we get started here, let me state that I am using Ruby 1.9.1 (I refuse to look back!), and that I have not tested this solution on Ruby 1.8.6, but it should work there as well, though I may have some 1.9-isms in my code. Should be easy enough to spot.

I am working on writing an application in Ruby that can talk to an Windows application that has an ActiveX COM Automation object exposed. Ruby is basically the wrapper so that I can access the application from the Linux side of the world. So, I am using Ruby’s DRb to bridge those worlds because, after all, I am the Linux Bloke!

Well, as you may have guessed, I ran into problems with this approach. I simply could not call the COM objects from a call initiated with DRb, though I could call them directly just fine. After scratching my head a bit, I figured it out.

The win32ole module that runs on the Windows side of the world in Ruby only …

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DbCharmer – Rails Can Scale!

Back in November 2009 I was working on a project to port Scribd.com code base to Rails 2.2 and noticed that some old plugins we were using in 2.1 were abandoned by their authors. Some of them were just removed from the code base, but one needed a replacement – that was an old plugin called acts_as_readonlyable that helped us to distribute our queries among a cluster of MySQL slaves. There were some alternatives but we didn’t like them for one or another reasons so we’ve decided to go with creating our own ActiveRecord plugin, that would help us scale our databases out. That’s the story behind the first release of DbCharmer.

Today, six months after the first release of …

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Liveblogging at Confoo: Blending NoSQL and SQL

Persistence Smoothie: Blending NoSQL and SQL – see user feedback and comments at http://joind.in/talk/view/1332.

Michael Bleigh from Intridea, high-end Ruby and Ruby on Rails consultants, build apps from start to finish, making it scalable. He’s written a lot of stuff, available at http://github.com/intridea. @mbleigh on twitter

NoSQL is a new way to think about persistence. Most NoSQL systems are not ACID compliant (Atomicity, Consistency, Isolation, Durability).

Generally, most NoSQL systems have:

  • Denormalization
  • Eventual Consistency
  • Schema-Free
  • Horizontal Scale

NoSQL tries to scale (more) simply, it is starting to go mainstream – NY …

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