关于 Laravel Redis 多个进程同时取队列问题详解(2)

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