Schema-Free MySQL vs NoSQL - igvita.com
By Ilya Grigorik on March 01, 2010 Amidst the cambrian explosion of alternative database engines (aka, NoSQL) it is almost too easy to lose sight of the fact that the more established solutions, such as relational databases, still have a lot to offer: stable and proven code base, drivers and tools for every conceivable language, and more features than any DBA cares to learn about. Not to mention t
Extending Tokyo Cabinet DB with Lua - igvita.com
By Ilya Grigorik on July 13, 2009 Tokyo Cabinet is a trove of hidden of gems, the more you learn about it, the more you will appreciate the design and technical decisions behind it. By database standards it is a young project (started in 2007), but since it is a successor to the QDBM project developed by Hirabayashi-san (2000-2007), we could make the argument that it has been, in fact, nine years
Tokyo Cabinet: Beyond Key-Value Store - igvita.com
By Ilya Grigorik on February 13, 2009 It took Ruby some time to go from an infant research project by Matz to a language we've all come to know so well. Now, another Japanese developer (Mikio Hirabayashi) has all the potential to repeat this cycle with his new database project: Tokyo Cabinet. Developed and sponsored by Mixi Inc. (Japanese Facebook), it is an incredibly fast, and feature rich datab
Scalable Datasets: Bloom Filters in Ruby - igvita.com
By Ilya Grigorik on December 27, 2008 When you're working with large datasets it's always nice to have a few algorithmic tricks up your sleeve, and Bloom Filters are exactly that - often overlooked, but an extremely powerful tool when used in the right context. A Bloom Filter is a probabilistic data structure that is used to test whether an element is a member of a set, or more simply, it's an inc
Zero-Downtime Restarts with HAProxy - igvita.com
By Ilya Grigorik on December 02, 2008 Putting up a maintenance page while you are doing an update and restarting your application servers is good practice, but it definitely hurts the user experience. This, in turn, translates to less frequent releases and frustration for both the developer and the users (release often, release early!). To address this, the Rails community has come up with a coupl
Parallelism is a Myth in Ruby - igvita.com
By Ilya Grigorik on November 13, 2008 Update: post has been renamed to "Parallelism is a Myth in Ruby"... Why? Because concurrency is not parallelism - highly recommend this talk by Rob Pike. Concurrency is the composition of independently executing things (which is possible in Ruby), and parallelism is the simultaneous execution of multiple things (which is not possible in MRI, see below). One is
Scaling ActiveRecord with MySQLPlus - igvita.com
By Ilya Grigorik on October 27, 2008 Late last week Rails core team announced the release of Rails 2.2RC1, which amongst other things slips in 'thread safety' and an implementation of a connection pool for our beloved ActiveRecord. Pratik Naik and Charles Nutter have both covered the implications of these contributions, but the executive summary is as follows: single ruby process (mongrel), plus m
Unix Signals for Live Debugging - igvita.com
By Ilya Grigorik on July 22, 2008 It's unit tested, the integration and regressions tests are all green, you even added a set of performance benchmarks, and yet after a couple of hours of production use the process is falling over - we've all been there before. Good instrumentation in these situations is worth its weight in gold. If you're lucky, you may be able to use DTrace, if you're adventurou
Load Balancing & QoS with HAProxy - igvita.com
By Ilya Grigorik on May 13, 2008 A brand new Rails/Merb app you put together over a weekend, a pack of Mongrels, a reverse proxy (like Nginx), and you're up and running. Well, almost, what about that one request that tends to run forever, often forcing the user to double check their internet connection? Response time is king, and you always want to make sure that your site feel snappy to the user.
Thrudb - faster, cheaper than SimpleDB - igvita.com
By Ilya Grigorik on December 28, 2007 Amazon's recent announcement of SimpleDB generated a lot of buzz in the community - finally, a database service for our virtual infrastructure! Well, not so fast. SimpleDB is a far cry from the usual RDMBS we're all used to, and it's best described as a key-value store (BerkeleyDB, really), or a meta-data storage layer for your S3 objects. If you're curious, C
Nginx and Memcached, a 400% boost! - igvita.com
By Ilya Grigorik on February 11, 2008 If web architectures, performance, or scalability are topics you would like to keep on top of (who doesn't!), then chances are, you've heard of Nginx ("engine x"). Originally developed by Igor Sysoev for rambler.ru (second largest Russian web-site), it is a high-performance HTTP server / reverse proxy known for its stability, performance, and ease of use. The
Monit makes Mongrel play nice! - igvita.com
By Ilya Grigorik on November 07, 2006 It's 8am am on a Monday morning, having finished my breakfast I park my enormous coffee mug on the desk, fire up Firefox and point it to my paradigm-shifting Rails application. I want to check the overnight activity, but instead Apache is shouting back at me: "Service is temporarily unavailable"! What happened!? (Insert a sarcastic Monday morning joke here) We
SVD Recommendation System in Ruby - igvita.com
By Ilya Grigorik on January 15, 2007 One day, a bunch of friends, who happened to be big Family Guy fans, decided to put together a site to rank and share their thoughts on the show. Soon thereafter they had a Rails site up and running, and all was well, and other fans joined in hordes. A web 2.0 success! Then one day they realized that they could no longer track everyone's ratings, their user-bas
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