Laravel Redis 多个进程同时取队列问题

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?

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

[program:laravel-worker] process_name=%(programname)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。

参考文章:

关于 Laravel 入队列和消费队列的具体过程可以看这篇文章,讲得非常详细