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Laravel Redis multiple processes fetch queue problem at the same time
- 小云云Original
- 2017-12-26 09:05:144124browse
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？本文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。希望能帮助到大家。
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。
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