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Detailed explanation of the problem of multiple processes fetching queues at the same time in Laravel Redis

jacklove
jackloveOriginal
2018-07-04 17:57:531939browse

这篇文章主要给大家介绍了关于 Laravel Redis 多个进程同时取队列问题的相关资料，文中通过示例代码介绍的非常详细，对大家的学习或工作具有一定的参考学习价值，需要的朋友下面来一起学习学习吧。

前言

最近在工作中遇到了一个问题，开启多个进程处理队列会重复读取 Redis 中队列吗？是否因此导致重复执行任务？下面就来通过示例代码详细介绍下。

使用 Supervisor 监听 Laravel 队列任务，其中 Supervisor 的配置如下：

[program:laravel-worker]
process_name=%(program_name)s_%(process_num)02d
command=php /var/www/xxx.cn/artisan queue:work --queue=sendfile --tries=3 --daemon
autostart=true
autorestart=true
numprocs=8
redirect_stderr=true
stdout_logfile=/var/www/xxx.cn/worker.log

注意： numprocs = 8，代表开启 8 个进程来执行 command 中的命令。

如下：

PS C:\Users\tanteng\website\laradock> docker-compose exec php-worker sh
/etc/supervisor/conf.d # ps -ef | grep php
 7 root  0:00 php /var/www/xxx.cn/artisan queue:work --queue=sendfile --tries=3 --daemon
 8 root  0:00 php /var/www/xxx.cn/artisan queue:work --queue=sendfile --tries=3 --daemon
 9 root  0:00 php /var/www/xxx.cn/artisan queue:work --queue=sendfile --tries=3 --daemon
 10 root  0:00 php /var/www/xxx.cn/artisan queue:work --queue=sendfile --tries=3 --daemon
 11 root  0:00 php /var/www/xxx.cn/artisan queue:work --queue=sendfile --tries=3 --daemon
 12 root  0:00 php /var/www/xxx.cn/artisan queue:work --queue=sendfile --tries=3 --daemon
 13 root  0:00 php /var/www/xxx.cn/artisan queue:work --queue=sendfile --tries=3 --daemon
 14 root  0:00 php /var/www/xxx.cn/artisan queue:work --queue=sendfile --tries=3 --daemon
 44 root  0:00 grep php

Laravel 多进程读取队列内容是否会重复

在 Laravel 的某个控制器方法，一次放入多个任务队列：

public function index(Request $request)
{
 $this->dispatch((new SendFile3())->onQueue('sendfile'));
 $this->dispatch((new SendFile3())->onQueue('sendfile'));
 $this->dispatch((new SendFile3())->onQueue('sendfile'));
 $this->dispatch((new SendFile3())->onQueue('sendfile'));
 $this->dispatch((new SendFile3())->onQueue('sendfile'));
 $this->dispatch((new SendFile3())->onQueue('sendfile'));
 $this->dispatch((new SendFile3())->onQueue('sendfile'));
 $this->dispatch((new SendFile3())->onQueue('sendfile'));
 $this->dispatch((new SendFile3())->onQueue('sendfile'));
 $this->dispatch((new SendFile3())->onQueue('sendfile'));
 $this->dispatch((new SendFile3())->onQueue('sendfile'));
 $this->dispatch((new SendFile3())->onQueue('sendfile'));
 $this->dispatch((new SendFile3())->onQueue('sendfile'));
 $this->dispatch((new SendFile3())->onQueue('sendfile'));
 $this->dispatch((new SendFile3())->onQueue('sendfile'));
 $this->dispatch((new SendFile3())->onQueue('sendfile'));
 $this->dispatch((new SendFile3())->onQueue('sendfile'));
 $this->dispatch((new SendFile3())->onQueue('sendfile'));
}

在队列处理的方法打印日志，打印处理的队列的 ID：

app/Jobs/SendFile3.php

public function handle()
{
 info('invoke SendFile3');
 dump('invoke handle');
 $rawbody = $this->job->getRawBody();
 $info = json_decode($rawbody, true);
 info('queue id:' . $info['id']);
}

Laravel 使用 Redis 的 list 作为队列的数据结构，并会为每个队列分配一个 ID，数据结构如下：

{
 "job": "Illuminate\\Queue\\CallQueuedHandler@call",
 "data": {
 "commandName": "App\\Jobs\\SendFile3",
 "command": "O:18:\"App\\Jobs\\SendFile3\":4:{s:6:\"\u0000*\u0000job\";N;s:10:\"connection\";N;s:5:\"queue\";s:8:\"sendfile\";s:5:\"delay\";N;}"
 },
 "id": "hadBcy3IpNsnOofQQdHohsa451OkQs88",
 "attempts": 1
}

请求这个控制器路由（或者命令行方式），就可以看到 Redis 中多了很多队列任务了，如图：

这个时候开启 Supervisor 处理队列任务，并查看日志：

[2017-12-23 19:01:01] local.INFO: invoke SendFile3
[2017-12-23 19:01:01] local.INFO: invoke SendFile3
[2017-12-23 19:01:01] local.INFO: invoke SendFile3
[2017-12-23 19:01:01] local.INFO: invoke SendFile3
[2017-12-23 19:01:01] local.INFO: invoke SendFile3
[2017-12-23 19:01:01] local.INFO: invoke SendFile3
[2017-12-23 19:01:01] local.INFO: invoke SendFile3
[2017-12-23 19:01:01] local.INFO: invoke SendFile3
[2017-12-23 19:01:01] local.INFO: queue id:JaClJzhDEvntzLCRIz6uRQkCVLbE8Y9C
[2017-12-23 19:01:01] local.INFO: queue id:ukHv0Li4P2VgPa55qU6yEOJM27Mo5YwJ
[2017-12-23 19:01:01] local.INFO: queue id:ObMpwDTmnaveBUkU7aan5abt3Agyt90l
[2017-12-23 19:01:01] local.INFO: queue id:fo2qZn2ftSdQtdnKOciMK7iJb4qlhRGE
[2017-12-23 19:01:01] local.INFO: queue id:uLjFMoOU7Wk7bOAd4zpHb3ccRMJHBtR6
[2017-12-23 19:01:01] local.INFO: queue id:87ULqPBObFmGr16nl5wxFVOi71zGCeRM
[2017-12-23 19:01:01] local.INFO: queue id:9UVl0muQLzBqlRI99rChGW2ElXwVEMIE
[2017-12-23 19:01:01] local.INFO: queue id:a0vgyZuz9HtmH7DGHEpXqesFTcQU3QAF
[2017-12-23 19:01:01] local.INFO: invoke SendFile3
[2017-12-23 19:01:01] local.INFO: invoke SendFile3
[2017-12-23 19:01:01] local.INFO: queue id:2cXuXxopPkgYiV4WO8gv9CJ6CwXeKtYL
[2017-12-23 19:01:01] local.INFO: invoke SendFile3
[2017-12-23 19:01:01] local.INFO: queue id:9acTAYa8cxpJX6Q3Gb1sULokotP8reqZ
[2017-12-23 19:01:01] local.INFO: invoke SendFile3
[2017-12-23 19:01:01] local.INFO: invoke SendFile3
[2017-12-23 19:01:01] local.INFO: queue id:BPHQvBboChlv4gr2I0vyLVyw9bijtTYJ
[2017-12-23 19:01:01] local.INFO: invoke SendFile3
[2017-12-23 19:01:01] local.INFO: queue id:Fm6tNajdxYKtdQbDMYDmwWJFLnNikRyg
[2017-12-23 19:01:01] local.INFO: invoke SendFile3
[2017-12-23 19:01:01] local.INFO: queue id:nyAbcvSkBVPbaH3e2ItQkoLJlP1ficib
[2017-12-23 19:01:01] local.INFO: queue id:WBHsSVZtP43569UoPXxfLLJcvYmPW7cP
[2017-12-23 19:01:01] local.INFO: invoke SendFile3
[2017-12-23 19:01:01] local.INFO: queue id:bliPnKcRSDApwVmKLNxEhaKelhm0RDEY
[2017-12-23 19:01:01] local.INFO: invoke SendFile3
[2017-12-23 19:01:01] local.INFO: invoke SendFile3
[2017-12-23 19:01:01] local.INFO: queue id:eOAoQucEIwRz9uZ64xm6IDKgiqj9Xc3W
[2017-12-23 19:01:01] local.INFO: invoke SendFile3
[2017-12-23 19:01:01] local.INFO: queue id:lzise9EiqQqINrhALbmAI4qNg7qylpb2
[2017-12-23 19:01:01] local.INFO: invoke SendFile3
[2017-12-23 19:01:01] local.INFO: queue id:WXYKvcfOhS1pPnwOwUTsenoMv5l5EUXe
[2017-12-23 19:01:01] local.INFO: invoke SendFile3
[2017-12-23 19:01:01] local.INFO: queue id:XtH5JiwLgnrwWzI02Oyi70pihAOkuJUD
[2017-12-23 19:01:01] local.INFO: invoke SendFile3
[2017-12-23 19:01:01] local.INFO: invoke SendFile3
[2017-12-23 19:01:01] local.INFO: queue id:9ehmE5HImlpNubpY0xWN8UVrOzxeMqws
[2017-12-23 19:01:01] local.INFO: queue id:C1sK87cpZl47edLA0zhfo7PJ9MIEcoyx
[2017-12-23 19:01:01] local.INFO: invoke SendFile3
[2017-12-23 19:01:01] local.INFO: invoke SendFile3
[2017-12-23 19:01:01] local.INFO: invoke SendFile3
[2017-12-23 19:01:01] local.INFO: queue id:2kwl51oH4lyyRrljCReGUCkNiJRDl7oe
[2017-12-23 19:01:01] local.INFO: queue id:ObRpoqrYTPYiyv2delMlOXu3sAPpWJlN
[2017-12-23 19:01:01] local.INFO: invoke SendFile3
[2017-12-23 19:01:01] local.INFO: queue id:6qgu6W3TapLjSrt688yv9HRXvDDLxntz
[2017-12-23 19:01:01] local.INFO: queue id:wiTlERhwn7s9cQkfUF9lLlNADpXjKncI
[2017-12-23 19:01:01] local.INFO: invoke SendFile3
[2017-12-23 19:01:01] local.INFO: queue id:ZSLW0VLFBDpL4wjTJzu3Yb3V45pNe807
[2017-12-23 19:01:01] local.INFO: invoke SendFile3
[2017-12-23 19:01:01] local.INFO: queue id:qhZlXLGfGWRluIeNm7VbllmTJZYb2h5n
[2017-12-23 19:01:01] local.INFO: invoke SendFile3
[2017-12-23 19:01:01] local.INFO: queue id:LUx1IByD3L2psNl9BZwHhk2knXyRPzW6
[2017-12-23 19:01:01] local.INFO: invoke SendFile3
[2017-12-23 19:01:01] local.INFO: queue id:M2RESPjyo5hpAFxxL0EQbWwsUq4jpmWn
[2017-12-23 19:01:01] local.INFO: invoke SendFile3
[2017-12-23 19:01:01] local.INFO: invoke SendFile3
[2017-12-23 19:01:01] local.INFO: queue id:hUsGaiIAOO6ZfGQc5kGHGpsv5RpoRPYO
[2017-12-23 19:01:01] local.INFO: queue id:cEHJsOy6bLeZ4NbncPziaHqlarMeyyEF
[2017-12-23 19:01:01] local.INFO: invoke SendFile3
[2017-12-23 19:01:01] local.INFO: queue id:w4bkFiJKMU5saqG2xKN3ZRL5BYXGATMk
[2017-12-23 19:01:01] local.INFO: invoke SendFile3
[2017-12-23 19:01:01] local.INFO: queue id:0zBuwbxlrEhhxKfYBkVyTY4z35f154sI
[2017-12-23 19:01:01] local.INFO: queue id:mvoZvyDPvq4tcPjEy9G7PMtH3MwPkPik
[2017-12-23 19:01:01] local.INFO: invoke SendFile3
[2017-12-23 19:01:01] local.INFO: queue id:TLvF74eeidECWKtjZqWvW03UJTRPTL9r
[2017-12-23 19:01:01] local.INFO: queue id:me8wyPfgcz0nf9xvcXz0hf2xVxqa1FFS

这 8 个进程并发处理队列，但从打印的日志看，没有出现同样的 ID. 我们再看一下 Laravel 如何使用 Redis 处理队列的。

分析一下 Laravel 队列的处理

Laravel 中入队列方法

public function pushRaw($payload, $queue = null, array $options = [])
{
 $this->getConnection()->rpush($this->getQueue($queue), $payload);
 
 return Arr::get(json_decode($payload, true), 'id');
}

用的是 Redis 的 rpush 命令。

Laravel 中取队列方法

public function pop($queue = null)
{
 $original = $queue ?: $this->default; 
 $queue = $this->getQueue($queue); 
 $this->migrateExpiredJobs($queue.':delayed', $queue); 
 if (! is_null($this->expire)) {
  $this->migrateExpiredJobs($queue.':reserved', $queue);
 } 
 list($job, $reserved) = $this->getConnection()->eval(
  LuaScripts::pop(), 2, $queue, $queue.':reserved', $this->getTime() + $this->expire
 ); 
 if ($reserved) {
  return new RedisJob($this->container, $this, $job, $reserved, $original);
 }
}

这里用的是 lua 脚本取队列，如下：

public static function pop()
{
 return <<<&#39;LUA&#39;
local job = redis.call(&#39;lpop&#39;, KEYS[1])
local reserved = false
if(job ~= false) then
reserved = cjson.decode(job)
reserved[&#39;attempts&#39;] = reserved[&#39;attempts&#39;] + 1
reserved = cjson.encode(reserved)
redis.call(&#39;zadd&#39;, KEYS[2], ARGV[1], reserved)
end
return {job, reserved}
LUA;
}

那么结论是：从 Laravel 的处理方式和打印的日志结果看，即使多个进程读取同一个队列，也不会读取到一样的数据。

总结

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