Backend DevelopmentPHP TutorialDetailed explanation of the problem of multiple processes fetching queues at the same time in Laravel RedisDetailed explanation of the problem of multiple processes fetching queues at the same time in Laravel Redis
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 <<<'LUA'
local job = redis.call('lpop', KEYS[1])
local reserved = false
if(job ~= false) then
reserved = cjson.decode(job)
reserved['attempts'] = reserved['attempts'] + 1
reserved = cjson.encode(reserved)
redis.call('zadd', 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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