php经过twemproxy无法delete后端memcache值的解决方法

php操作memcache的代码如下：

[root@robin mc]# cat memcache.php 

<?php

$conf = array(

    array("host" => '192.168.8.57', "port" => '7522'),

    //array("host" => '192.168.90.130', "port" => '7510'),

    //array("host" => '192.168.30.22', "port" => '7011')

    //array("host" => '192.168.30.23', "port" => '7030')

    //array("host" => '192.168.1.61' , "port" => '11211'),

);

$memcache = new Memcache();

memcache_debug(true);

foreach ($conf as $memCachedConfig) {

    @$memcache->addServer($memCachedConfig['host'], $memCachedConfig['port']);

}

$str = "test";

@$memcache->set('testkey', $str);

echo $memcache->get('testkey');

echo "\n";

try{

$rs = $memcache->delete('testkey', 0);

}catch( Exception $e ){

    print_r($e->getMessage());

var_dump($rs);

#备注：192.168.8.57为haproxy的虚ip，后端指向的是192.168.30.21和192.168.30.22这两个twemproxy，然后twemproxy的后端又是192.168.30.21、192.168.30.22、192.168.30.23、192.168.30.24这4个memcache

执行但无法删除的显示结果如下：

[root@robin mc]# php memcache.php 

test

bool(false)##如果删除成功显示的应该是true

问题的原因定位是因为php的memcache扩展版本过低造成的，应该是php的低版本memcache的一个bug，升级就可以解决了

升级前：

<a href="http://s3.51cto.com/wyfs02/M00/5C/28/wKiom1UblgHSvBfcAACDKP26Zsg736.jpg" target="_blank"></a>

升级后：

<a href="http://s3.51cto.com/wyfs02/M01/5C/28/wKiom1UblhaAwxqQAABlSaS1Fdw280.jpg" target="_blank"></a>

升级步骤：

tar xf memcache-3.0.8.tgz 

cd memcache-3.0.8

/usr/local/webserver/php/bin/phpize

./configure --with-php-config=/usr/local/webserver/php/bin/php-config

make

make install

/kuxun/php-cgid restart

php -m | grep mem

查看phpinfo的方法

nginx配置如下：

[root@robin sites-enabled]# vim op.conf 

log_format  op_log "$remote_addr" - "$remote_user" [$time_local] "$request"

                   "$status" "$body_bytes_sent" "$http_referer"

                   "$http_user_agent" "$http_x_forwarded_for";

server {

        listen 80;

        server_name 192.168.90.99;

        set $ROOT_PATH /home/himalayas/op;

        location / {

        #auth_basic            "Password please";

        #auth_basic_user_file  /usr/local/webserver/nginx/conf/htpasswd;

        root $ROOT_PATH;

        index index.php;

        }

        location ~ .php$ {

        fastcgi_pass  unix:/tmp/php-cgi.sock;

        fastcgi_param  SCRIPT_FILENAME  $ROOT_PATH$fastcgi_script_name;

        send_timeout 300;

        fastcgi_buffers 8 256k;

        include /usr/local/webserver/nginx/conf/fastcgi_params;

    }

        access_log /home/nginxlog/accesslog/access.log op_log;

        error_log /home/nginxlog/errorlog/error.log;

代码如下：

[root@robin ~]# cat /home/himalayas/op/test.php 

phpinfo();

?&gt;

访问方式：http://192.168.90.99/test.php

      本文转自Tenderrain 51CTO博客，原文链接：http://blog.51cto.com/tenderrain/1627342，如需转载请自行联系原作者