memcached使用及监控

memached，分布式缓存，在互联网应用中应用相当普遍，性能极佳，下面简单说一下memcached的使用及监控。

1) 确认libevent已安装

# rpm -qa | grep libevent
# yum install libevent-devel

(如果是RHEL5请查看我的另外一遍博文：http://www.cnblogs.com/javapro/archive/2012/09/25/2701462.html)

2) 安装memcached

# tar zxvf memcached-1.4.15.tar.gz
# cd memcached-1.4.15
# ./configure --prefix=/usr/local/memcached-1.4.15
# make && make test
# make install
# make clean

3) 使用

# memcached -d -u memcached -p 12000 -f 1.25 -m 1024

memcached -d -u memcached -p 12001 -f 1.25 -m 1024

memcached -d -u memcached -p 12002 -f 1.25 -m 1024

memcached -d -u memcached -p 12003 -f 1.25 -m 1024

-p 侦听端口号
-t 线程数(与CPU个数一致)
-f 成长因子，可以有效使用内存
-m 最大使用内存
-d 后台驻留

键名：appname:modulename:entity:id

>> 使用phpMemcachedAdmin进行监控
1) 安装php

# tar zxvf php-5.3.17.tar.gz
# cd php-5.3.17
# ./configure --prefix=/usr/local/php-5.3.17 --enable-mbstring --with-apx2=/usr/local/httpd-2.0.64/bin/apxs
# make && make test
# make install
# make clean

2) 安装phpMemcachedAdmin

# tar zxvf phpMemcachedAdmin-1.2.2-r262.zip
# mv phpMemcachedAdmin-1.2.2-r262 /usr/local/httpd-2.0.64/htdocs/memcached

3) 修改apache配置

# vi /usr/local/httpd-2.0.64/conf/httpd.conf

AddType application/x-httpd-php .php

AddType application/x-httpd-php-source .phps

DirectoryIndex index.php index.html

<Directory "/usr/local/httpd-2.0.64/htdocs/memcached">
Options FollowSymLinks
AllowOverride None
Order allow,deny
Allow from all
</Directory>

 

>> Spring整合memcached

<bean id="memcachedClient" class="net.spy.memcached.spring.MemcachedClientFactoryBean">
  <property name="servers" value="10.1.1.116:12000,10.1.1.116:12001,10.1.1.116:12002,10.1.1.116:12003" />
  <property name="protocol" value="BINARY" />
  <property name="transcoder">
    <bean class="net.spy.memcached.transcoders.SerializingTranscoder">
      <property name="compressionThreshold" value="1024"/>
    </bean>
  </property>
  <property name="opTimeout" value="1000" />
  <property name="timeoutExceptionThreshold" value="1998" />
  <property name="hashAlg">
    <value type="net.spy.memcached.DefaultHashAlgorithm">KETAMA_HASH</value>
  </property>
  <property name="locatorType" value="CONSISTENT" />
  <property name="failureMode" value="Redistribute" />
  <property name="useNagleAlgorithm" value="false" />
</bean>

>> add和set的区别

add和set方法的不同之处是add方法不允许key值相同，如果第二次add的key相同，则存储失败，而set方法允许key相同，如果相同，则替换该key对应的value。