Akihiro Yamamoto varmil

## [memo] 2015.01.11.md

      
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                varmil
                / [memo] 2015.01.11.md
            
            
              Last active
              August 29, 2015 14:13
            
              
                2015/01/11 勉強まとめ
              
          
    Build A Real-Time Twitter Stream with Node and React.js

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 サーバ側のレンダリングとクライアント側でのレンダリングを二重で行っている？つまり、サーバ側でのレンダリングは不要では？VirtualDOMの特性を生かしている感じか？

res.render('home', {
  markup: markup, // Pass rendered react markup
 state: JSON.stringify(tweets) // Pass current state to client side

  
## extends.php
<?php
class Super {
	private $id = 'super';

	public function do_something() {
		return $this->get_id();
	}
	public function get_id() {
		return $this->id;
	}

## bad
var f = function(v) {
  switch (v) {
    case 'a':
      return 1;
      break;
    case 'b':
      return 2;
      break;
    case 'c':
      return 3;

## bad.js
var fs = require('fs');
var MongoClient = require('mongodb').MongoClient;
var CSV = require('comma-separated-values');

var NAME_MONGO_DB = 'eijiro';
var NAME_MONGO_COLLECTION = 'words';
var url = 'mongodb://localhost:27017/' + NAME_MONGO_DB;

var inputCsv = process.argv[2];
var text = fs.readFileSync(inputCsv, 'utf-8');

## file0.cs
class Model
{
    // データ変更時に呼ばれる
    void DataChanged() {
        // 変更後のデータを取得
        var newData = this.GetData();
        // ModelからViewを直接変更（MVC原則に違反しています！）
        FooView.Update(newData);
    }
}

## .bash_profile
PHANTOMJS_EXECUTABLE=$HOME/.nodebrew/current/lib/node_modules/casperjs/node_modules/phantomjs/bin/phantomjs

## mysql_sharding.md

      
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                varmil
                / mysql_sharding.md
            
            
              Created
              May 13, 2016 10:00
            
          
    MySQL Sharding
Sharding Pinterest: How we scaled our MySQL fleet - pinterest enginnering

8台の物理サーバに1つずつMySQLインスタンス。それぞれのインスタンスは master - master replicated onto a backup host in case the primary fails
use master, not slave...


Our production servers only read/write to the master. I recommend you do the same. It simplifies everything and avoids lagged replication bugs.

各MySQLインスタンスは512個位ずつdatabaseを持つ。

  
## file0.sql
SELECT Name,Dept FROM Employees WHERE Id = 3;

## Vagrantfile
config.vm.provision "shell", run: "always", inline: "systemctl restart network.service"

## file0.txt
  nginx:
    image: nginx:1.10.2-alpine
    volumes:
     - ./nginx/nginx.conf:/etc/nginx/nginx.conf
     - ./nginx/mynginx.cnf:/etc/nginx/conf.d/mysite.template
    ports:
     - "8080:80"
    environment:
     - NGINX_HOST=127.0.0.1
     - NGINX_PORT=80
	<?php
	class Super {
	private $id = 'super';

	public function do_something() {
	return $this->get_id();
	}
	public function get_id() {
	return $this->id;
	}
	var f = function(v) {
	switch (v) {
	case 'a':
	return 1;
	break;
	case 'b':
	return 2;
	break;
	case 'c':
	return 3;
	var fs = require('fs');
	var MongoClient = require('mongodb').MongoClient;
	var CSV = require('comma-separated-values');

	var NAME_MONGO_DB = 'eijiro';
	var NAME_MONGO_COLLECTION = 'words';
	var url = 'mongodb://localhost:27017/' + NAME_MONGO_DB;

	var inputCsv = process.argv[2];
	var text = fs.readFileSync(inputCsv, 'utf-8');
	class Model
	{
	// データ変更時に呼ばれる
	void DataChanged() {
	// 変更後のデータを取得
	var newData = this.GetData();
	// ModelからViewを直接変更（MVC原則に違反しています！）
	FooView.Update(newData);
	}
	}
	nginx:
	image: nginx:1.10.2-alpine
	volumes:
	- ./nginx/nginx.conf:/etc/nginx/nginx.conf
	- ./nginx/mynginx.cnf:/etc/nginx/conf.d/mysite.template
	ports:
	- "8080:80"
	environment:
	- NGINX_HOST=127.0.0.1
	- NGINX_PORT=80