将yii与memcache结合使用，当两个服务器之一发生故障时出错 [英] using yii with memcache, error when one of two server fails

问题描述

我对ii和将数据存储在内存缓存中有问题.对于我的应用程序，我使用system.caching.CMemCache和以下配置:

i have a problem with yii and storing data in memcache. For my application i use system.caching.CMemCache and the following config:

'servers' => array(
    'server1' => array('host' => 'localhost', 'port' => 11211, 'weight' => 50),
    'server2' => array('host' => '192.168.0.2', 'port' => 11211, 'weight' => 50)
),

如果两个系统上的内存缓存都在运行，则一切正常，并且这些值将散布在服务器上.但是，如果一台服务器发生故障(或者如果我手动停止了内存缓存)，则该应用程序会抛出诸如

if memcache on both systems is running, everything is ok and the values get spread up on the servers. but if one server fails (or if i stop the memcache manually) the application throw errors like

MemcachePool::get(): Server 192.168.0.2 (tcp 11211, udp 0) failed with: Connection refused (111)

这不是很好，我想如果一台服务器出现故障，yii会选择另一台服务器进行读写，或者至少会产生一些高速缓存未命中，并且不会抛出异常:(

this isn't really nice, i thought if one server failed yii would choose another server for reading and writing or at least produce some cache misses and do not throw an exeption :(

这是正常现象还是存在一些配置问题?

is this normal or are there some configuration issues?

推荐答案

我认为您看到的是讨论过的消息，这很正常

I think its normal you are seeing those messages as discussed here, given you are using memcache extension

还要阅读 SO .

php扩展有两个版本，一个是memcache，另一个是memcached.您可以将它们安装在ubuntu盒子上，例如:

There are two version of extension for php one is memcache while the other is memcached. You can install each of them on ubuntu box like :

 sudo apt-get install php5-memcache
  and 
 sudo apt-get install php5-memcached 

Memecached扩展程序处理failover情况，正如我从上述链接中读取的内容并通过测试yii中的以下设置进行确认

Memecached extension handles failover situations ,as I read from the above links and confirm by testing following settings in yii

'cache'=>array(
            'class'=>'CMemCache',
            'useMemcached'=>true,
            'servers'=>array(
                array(
                    'host'=>'localhost',
                    'port'=>11211,
                    'weight'=>60,
                ),
                array(
                    'host'=>'192.168.33.31',
                    'port'=>11211,
                    'weight'=>30,
                ),
            ),
        ),

如上所述安装php的memcached扩展名并添加'useMemcached'=>true,设置以缓存配置.当我在本地主机上进行测试时，它可以处理故障转移情况，但是页面响应时间大大缩短.

Install the memcached extension for php as described above and add 'useMemcached'=>true, setting to cache configs.As I test on my localhost, it handles the failover situation, but the page response time drops significantly.

希望这会有所帮助.

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