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Home Backend Development PHP Tutorial 一个功能带来的高并发问题

一个功能带来的高并发问题

Jun 06, 2016 pm 08:46 PM
node.js php distributed Performance optimization High concurrency

有这样一个需求。用户想注册域名,但是呢,通常想的好的,都被人注册了。
这时候,程序自动的生成一定数量的域名,假设生成100个。然后在自动的查询
这100个域名是否被注册,从生成开始,域名就已经显示给了用户,然后
ajax来实时的更新每一个域名是否被注册的状态。

这时候,一个用户,就会带来100个并发查询,而且查域名状态,是需要连接whois服务器,有一个网络传输的过程
也就是这100个ajax查后台,就会带来100个php去发出whois的查询,等待结果,分析结果,返回给ajax调用

一般情况下,有几个用户同时一查。php的处理进程 就被占满了。整个站点的其他需要php实现都要处于等待状态了。。

这种情况下,要怎么优化呢?

我想的方案是:
1,将查询域名状态这事拿出去,放到另一个服务器上做。
2,查询域名状态不使用这种同步的方式,改用node.js这种异步模型的实现来做。

回复内容:

有这样一个需求。用户想注册域名,但是呢,通常想的好的,都被人注册了。
这时候,程序自动的生成一定数量的域名,假设生成100个。然后在自动的查询
这100个域名是否被注册,从生成开始,域名就已经显示给了用户,然后
ajax来实时的更新每一个域名是否被注册的状态。

这时候,一个用户,就会带来100个并发查询,而且查域名状态,是需要连接whois服务器,有一个网络传输的过程
也就是这100个ajax查后台,就会带来100个php去发出whois的查询,等待结果,分析结果,返回给ajax调用

一般情况下,有几个用户同时一查。php的处理进程 就被占满了。整个站点的其他需要php实现都要处于等待状态了。。

这种情况下,要怎么优化呢?

我想的方案是:
1,将查询域名状态这事拿出去,放到另一个服务器上做。
2,查询域名状态不使用这种同步的方式,改用node.js这种异步模型的实现来做。

nodejs暴力做是一种方法,另一种思路是做一个任务队列,控制总的并发量,比如最高并发50,然后每个用户查询的时候就push100个任务进队列,队列太长的时候可以告诉用户系统忙这样

不过无论如何做,首先要做的是把100个ajax改成1个……

你可以优化一下,不用每个用户都发送100个ajax请求,可以合并成一个ajax请求返回100个域名的状态。

php后端根据要查询的100个域名并发(批量)向whois服务器请求数据,并发的获取结果。
php并发(批量)http请求例子是这样的

<code><?php // 创建一对cURL资源
$ch1 = curl_init();
$ch2 = curl_init();

// 设置URL和相应的选项
curl_setopt($ch1, CURLOPT_URL, "http://whois.com/");
curl_setopt($ch1, CURLOPT_HEADER, 0);
curl_setopt($ch2, CURLOPT_URL, "http://whois.com/");
curl_setopt($ch2, CURLOPT_HEADER, 0);

// 创建批处理cURL句柄
$mh = curl_multi_init();

// 增加2个句柄
curl_multi_add_handle($mh,$ch1);
curl_multi_add_handle($mh,$ch2);

$active = null;
// 执行批处理句柄
do {
    $mrc = curl_multi_exec($mh, $active);
} while ($mrc == CURLM_CALL_MULTI_PERFORM);

// 轮询Server返回的结果
while ($active && $mrc == CURLM_OK) {
    if (curl_multi_select($mh) != -1) {
        do {
            $mrc = curl_multi_exec($mh, $active);
        } while ($mrc == CURLM_CALL_MULTI_PERFORM);
    }
}

// 汇总结果......

// 关闭全部句柄
curl_multi_remove_handle($mh, $ch1);
curl_multi_remove_handle($mh, $ch2);
curl_multi_close($mh);
</code></code>
Copy after login

这样能保证一个php进程并发的查询域名状态,而不是一个一个阻塞的去查,非常高效。设置超时时间,就不会导致进程因为网络io给阻塞占满了。

https://github.com/visionmedia/batch 根据你的实际情况调节下参数就行了。

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