重要な順で
優秀なプログラマーというのは寝ている間に異世界に召喚されて無双するのとはわけが違うんですよ。
自分の例で言うとプログラミングを始めた中学生の時から優秀なプログラマだったかって、そんなわけない。みんなヘッポコからスタートしているに決まってるわけです。以来二十余年、地道に生き恥を晒し続けてきた結果として、現在いちおう業界の末席を汚すところまで来ている。このプロセスから目を背けるべきではないです。優秀なプログラマーに生まれる人間なんかいない。優秀なプログラマーに「育つ」んだし、それには時間が必要。今日から無双したいと思うな。
My Elasticsearch cheatsheet with example usage via rest api (still a work-in-progress)
FWIW: I (@rondy) am not the creator of the content shared here, which is an excerpt from Edmond Lau's book. I simply copied and pasted it from another location and saved it as a personal note, before it gained popularity on news.ycombinator.com. Unfortunately, I cannot recall the exact origin of the original source, nor was I able to find the author's name, so I am can't provide the appropriate credits.
For this configuration you can use web server you like, i decided, because i work mostly with it to use nginx.
Generally, properly configured nginx can handle up to 400K to 500K requests per second (clustered), most what i saw is 50K to 80K (non-clustered) requests per second and 30% CPU load, course, this was 2 x Intel Xeon with HyperThreading enabled, but it can work without problem on slower machines.
You must understand that this config is used in testing environment and not in production so you will need to find a way to implement most of those features best possible for your servers.
NOTE: This post now lives (and kept up to date) on my blog: http://hakunin.com/rails3-load-paths
Do nothing. All files in this dir are eager loaded in production and lazy loaded in development by default.
As your business logic gets complex you may need to implement transactions. The classic example is a bank funds transfer from account A to account B. If the withdrawal from account A fails then the deposit to account B should either never take place or be rolled back.
All the complexity is handled by ActiveRecord::Transactions. Any model class or instance has a method named .transaction. When called and passed a block, that block will be executed inside a database transaction. If there's an exception raised, the transaction will automatically be rolled back.
