Gearman work queue in php用 Gearman打造 PHP排程

2013.10.05

@appleboy

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Who am I

Bo-Yi Wu @appleboyhttp://blog.wu-boy.comhttps://github.com/appleboy

任職於瑞昱半導體 RealTek(IC Design House)

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今日來聊聊排程系統

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排程使用時機 ?

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不需要即時回覆都可以使用排程

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哪些應用需要排程 ?

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使用者註冊系統

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使用者註冊

填寫表單完成

寄發認證信

使用者收到回覆

未使用排程

處理資料

透過第三方寄信Amazone SES

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缺點 Response time過長使用者不需要等伺服器寄信

(來自知名插畫家彎彎 )

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使用者註冊

填寫表單完成

寄發認證信

使用者收到回覆

使用排程

處理資料

寫入排程

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Email Queue?Github Social Coding

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Application Server

Database Database Database

Work Queue

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執行排程Linux crontab

Ref: http://www.xenstreet.com/2013/03/choosing-the-right-linux/

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<?php $link = mysqli_connect("host", "user", "passw", "db"); $query = 'SELECT * FROM jobs where status = "on"'; $result = $link->query($query); while($row = mysqli_fecth_array($result)) { // ….... // do work // ….... $sql = 'update jobs set status = "off" where id = {$row["id"]}'; $link->query($sql); }

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每分鐘執行一次*/1 * * * * root cron.sh

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優點

● 容易瞭解

● 任何程式語言都可以實現

● 快速 Deploy到任何機器

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缺點

● 每分鐘只能執行一次

● Race condition● 浪費 Database資源

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換個寫法來試試看

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每 10秒執行一次

<?php$link = mysqli_connect("myhost","myuser","mypassw","mybd");$query = 'SELECT * FROM jobs where status = "on"';$done = false;while(!$done) { $result = $link->query($query); if ($result->num_rows > 0) { // do work $sql = 'update jobs set status = "off" where id = {$row["id"]}'; $link->query($sql); } else { sleep(10); }}

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缺點

● 真的 10秒執行一次 ?● Race condition● 更浪費 Database資源

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如果沒有 Race Condition

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#!/bin/sh(sleep 5 && /path/script.sh) &(sleep 15 && /path/script.sh) &(sleep 25 && /path/script.sh) &(sleep 35 && /path/script.sh) &(sleep 45 && /path/script.sh) &(sleep 55 && /path/script.sh) &

每 10秒執行一次

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如何分配處理這些問題 ?

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Using Gearman

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What is Gearman?

It allows you to do work in parallel, to load balance processing, and to call

functions between languages.

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Client inPerl,Python,PHPJava,C#(.Net)

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evenMySQL,PostgreSQL

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How Does Gearman Work?

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Gearman優點

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Work Queues● 淺顯易懂

Got job do job repeat→ →

Application

Gearmand

Worker

Got job

Do job

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Work Queues● 淺顯易懂

Get job do job repeat→ →

● 跨語言

任何平台只要能存入字串即可

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Multiple Language

Application

Gearmand

Application

Worker Worker

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Work Queues● 淺顯易懂

Get job do job repeat→ →

● 跨語言

任何平台只要能存入字串即可

● 跨平台

當 Client寫入工作時，Worker不需要啟動

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跨平台

Application

Gearmand

Application

Gearmand

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Work Queues● 淺顯易懂

Get job do job repeat→ →

● 跨語言

任何平台只要能存入字串即可

● 跨平台

當 Client寫入工作時，Worker不需要啟動● 即時性

可以為同步或非同步

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Gearman Architecture佈署架構

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Application

Gearmand

Job

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Application

Gearmand

Job

Worker

Job

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Application

Gearmand

Job

Worker

Job Response

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Application

Gearmand

Job

Worker

Job Response

Response

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Application

Gearmand

Worker

Worker

Worker

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Application

Gearmand

Worker

Worker

Gearmand

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Application

Gearmand

Worker

Worker

Gearmand

Application

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結論 :Gearman擴充性佳

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不論要幾台 gearmand跟數個 worker都可以

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Application只會跟Gearmand溝通

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多個 Application不管丟出多少個 Jobs

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最終由多個 Job Server分配工作

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Synchronous vs

Asynchronous

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Synchronous Application

Gearmand

Job

Worker

Job Response

Response

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AsynchronousApplication

Gearmand

Job

Worker

Job Done!

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Installation安裝方式

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Installation

● Job Server (C)● Client library (PHP,Python ...)● Worker library (PHP,Python ...)

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Job Server安裝方式

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Ubuntu/Debianaptitude -y install gearman gearman-job-server libgearman-dev libdrizzle0

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CentOS/Fedorayum -y install libgearman gearmand libgearman-devel libdrizzle

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Tarball installhttps://gist.github.com/appleboy/6774735

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Gearmand enabled usingMySQL(Mariadb)

PostgresqlSQL Lite

Memcached

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MySQL Example/etc/default/gearman-job-server

-q mysql --mysql-host=localhost

--mysql-user=xx --mysql-password=xx

--mysql-db=ovoq --mysql-table=gearman_queue

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Client Librarypecl install channel://pecl.php.net/gearman-1.1.2echo 'extension=gearman.so' > /path/gearman.ini

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Quick Testphp -i | grep 'gearman'

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Gearman in PHP Client

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PHP Client# Create a client object

$gm = new GearmanClient();

# Add default server, default is localhost:4730

$gm->addServer();

# Do Job

$result = $gm->doNormal("reverse", "Hello!");

echo "Success: $result\n";

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Do background Job$job = $gm->doBackground("reverse", "apple");

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Gearman in PHP Worker

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PHP Worker

# Define worker job function

function reverse_fn($job) { //.... }

# fetch message from client

function reverse_fn($job) {

$data = $job->workload();

}

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PHP Worker# Create our worker object.

$gm= new GearmanWorker();

# Add default server (localhost).

$gm->addServer();

# Register function "reverse"

$gm->addFunction("reverse", "reverse_fn");

# Waiting for job...

while($gm->work());

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Multiple Jobs$gm->addFunction("reverse", "reverse_fn");

$gm->addFunction("resize", "resize_fn");$gm->addFunction("queue", "queue_fn");

…...

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Anonymous function$gm->addFunction("reverse", function($job){

$data = $job->workload(); });

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Gearman in CodeIgniter

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CodeIgniter Gearman Libraryhttps://github.com/appleboy/CodeIgniter-Gearman-Library

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Installation via Sparkphp tools/spark install -v1.0.1 codeigniter-gearman

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Setup Gearmand Server and Portconfig/gearman.php

$config['gearman_server'] = array('localhost'); $config['gearman_port'] = array('4730');

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CodeIgniter Client

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Implement Image Resize Jobcreate app controller

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class App extends CI_Controller{

public function resize_sync()public function resize_async()

}

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public function resize_sync(){ $data = json_encode(array('file_name' => 'test.png')); $client = $this->lib_gearman->gearman_client(); do {

$this->lib_gearman->do_job_foreground('resize', $data); switch($client->returnCode()) { //.... }

} while ($client->returnCode() != GREARMAN_SUCCESS);}

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class App extends CI_Controller{

public function resize_sync()public function resize_async()

}

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public function resize_async(){ $data = json_encode(array('file_name' => 'test.png')); $client = $this->lib_gearman->gearman_client(); $this->lib_gearman->do_job_background('resize', $data));}

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CodeIgniter Workercreate cli controller

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class Cli extends CI_Controller{

public static function image_resize()public static function email_queue()public function worker()

}

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public static function image_resize($job){ $data = json_decode($job->workload(), true); $ci =& get_instance(); $ci->image_lib->initialize($config); $ci->image_lib->resize(); $ci->image_lib->clear();}

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Define Worker

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public function worker(){ $worker = $this->lib_gearman->gearman_worker(); $this->lib_gearman ->add_worker_function('resize', 'Cli::image_resize'); $this->lib_gearman ->add_worker_function('queue', 'Cli::email_queue'); while ($this->lib_gearman->work());}

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Start Worker$ php index.php cli worker

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Running workers via script#!/bin/shscript="index.php cli worker"folder="/script_path/"max_worker="5"php_bin="/usr/bin/php"count=0current_count=$(ps aux | grep "index.php cli worker" | grep -v "grep" | wc -l)

if test $current_count -lt $max_workerthen

cd $folder$php_bin $folder$script &

elseecho "The worker count has been limited."

fihttps://gist.github.com/appleboy/6806323

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About Job DataDon't pass 2GB object.

Gearman is not data center.

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Keep your message data smallAmazone SQS message siez: 256K

http://goo.gl/0MBq8W

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Scalability

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Client Client

Job Server

Client

ClientWorker Worker Worker Worker

Job Server

Client

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you can scale out your clients and workers

as needed

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Client SettingClient1, Client2: Gearman1Client3, Client4: Gearman2

…...

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Worker SettingWorker[1-4]:Server[1-2]

…...

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Add new Job Server...

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Reconfigure all setting(client and worker program)

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Reconfigure all setting(client and worker program)

evenDeploy Tool

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如何控制易怒的情緒?

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How to improve your architecture?

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Client Client

Job Server

Client

ClientWorker Worker Worker Worker

Job Server

Client

Proxy (Haproxy ...)

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Live DemoEmail Queue.

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Any Questions?

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Thanks全體工作人員和聽眾