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Memcached分布式客户端(Xmemcached)
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memcached 安装配置:http://donald-draper.iteye.com/blog/2395580
memcached 命令:http://donald-draper.iteye.com/blog/2395628
Memcached Standby客户端:http://donald-draper.iteye.com/blog/2396260
上一篇MemcachedStandbyClient文章,我们测试了XMemcached的Standby模式客户端,
今天来看一下XMemcached分布式客户端:
Memcached的分布是通过客户端实现的,客户端根据key的哈希值得到将要存储的memcached节点,并将对应的value存储到相应的节点。XMemcached同样支持客户端的分布策略,
默认分布的策略是按照key的哈希值模以连接数得到的余数,对应的连接就是将要存储的节点。如果使用默认的分布策略,你不需要做任何配置或者编程。
XMemcached同样支持一致性哈希(consistent hash),通过编程设置:
一致性hash可以参见这篇文章:
MemCache超详细解读:http://www.csdn.net/article/2016-03-16/2826609
XMemcached还提供了额外的一种哈希算法——选举散列,在某些场景下可以替代一致性哈希
我们选用用一致性hash算法:
本文的源代码可以从以下地址load:
https://github.com/Donaldhan/memcached-demo
启动3个memcached实例:
创建memcache属性文件memcached.properties:
创建属性文件工具类:
创建memcache分布式客户端:
创建测试类:
运行测试类,控制台输出如下:
从控制台输出来看,与Standby客户端的测试类控制台输出基本没有区别,唯一不同的是,创建了三个会话,三个会话的Memcached实例为:
关闭客户端时,同时关闭了三个会话:
分别连接3个Memcached实例,分别获取name,age,counter属性:
从上面可以看出,由于我们name属性已经删除,所有name为空,counter在11211上,
age在11213上。
创建测试实例2:
运行测试类控制台输出:
分别连接3个Memcached实例,分别获取name,age,counter属性:
从上面可以看出,name,age,counter分布在11211,11212,11213上。
memcached 命令:http://donald-draper.iteye.com/blog/2395628
Memcached Standby客户端:http://donald-draper.iteye.com/blog/2396260
上一篇MemcachedStandbyClient文章,我们测试了XMemcached的Standby模式客户端,
今天来看一下XMemcached分布式客户端:
Memcached的分布是通过客户端实现的,客户端根据key的哈希值得到将要存储的memcached节点,并将对应的value存储到相应的节点。XMemcached同样支持客户端的分布策略,
默认分布的策略是按照key的哈希值模以连接数得到的余数,对应的连接就是将要存储的节点。如果使用默认的分布策略,你不需要做任何配置或者编程。
XMemcached同样支持一致性哈希(consistent hash),通过编程设置:
MemcachedClientBuilder builder = new XMemcachedClientBuilder(AddrUtil .getAddresses(properties.getProperty("test.memcached.servers")) builder.setSessionLocator(new KetamaMemcachedSessionLocator()); MemcachedClient client=builder.build();
一致性hash可以参见这篇文章:
MemCache超详细解读:http://www.csdn.net/article/2016-03-16/2826609
XMemcached还提供了额外的一种哈希算法——选举散列,在某些场景下可以替代一致性哈希
MemcachedClientBuilder builder = new XMemcachedClientBuilder( AddrUtil.getAddresses("server1:11211 server2:11211 server3:11211")); builder.setSessionLocator(new ElectionMemcachedSessionLocator()); MemcachedClient mc = builder.build();
我们选用用一致性hash算法:
本文的源代码可以从以下地址load:
https://github.com/Donaldhan/memcached-demo
启动3个memcached实例:
[memcached@donald ~]$ memcached -p 11211 -d -u memcached -l 192.168.126.128 -c 1024 [memcached@donald ~]$ memcached -p 11212 -d -u memcached -l 192.168.126.128 -c 1024 [memcached@donald ~]$ memcached -p 11213 -d -u memcached -l 192.168.126.128 -c 1024 [memcached@donald ~]$ ps -ef | grep memcached root 4514 1248 0 22:01 ? 00:00:00 sshd: memcached [priv] memcach+ 4517 4514 0 22:01 ? 00:00:00 sshd: memcached@pts/1 memcach+ 5172 1 0 22:04 ? 00:00:00 memcached -p 11211 -d -u memcached -l 192.168.126.128 -c 1024 memcach+ 5208 1 0 22:07 ? 00:00:00 memcached -p 11212 -d -u memcached -l 192.168.126.128 -c 1024 memcach+ 5219 1 0 22:07 ? 00:00:00 memcached -p 11213 -d -u memcached -l 192.168.126.128 -c 1024 memcach+ 5238 4522 0 22:07 pts/1 00:00:00 grep --color=auto memcached [memcached@donald ~]$
创建memcache属性文件memcached.properties:
############################ ##memcached server ip address list ############standby############## standbyServerList=192.168.126.128:11211 ############Distribute############## distributeServerList=192.168.126.128:11211 192.168.126.128:11212 192.168.126.128:11213 poolName=sidsock poolSize=16
创建属性文件工具类:
package util; import java.io.IOException; import java.io.InputStream; import java.util.Properties; import org.slf4j.Logger; import org.slf4j.LoggerFactory; /** * * @author donald * 2017年9月29日 * 下午10:21:34 */ public class PropertiesUtil { private static final Logger log = LoggerFactory.getLogger(PropertiesUtil.class); private static final String MEMCACHED_CONFIG_FILE = "memcached.properties"; private static volatile PropertiesUtil instance = null; private static Properties properties = null; static{ if (properties == null) { properties = new Properties(); } try { InputStream inputStream = Thread.currentThread().getContextClassLoader() .getResourceAsStream(MEMCACHED_CONFIG_FILE); properties.load(inputStream); } catch (IOException e1) { e1.printStackTrace(); } } /** * * @return */ public static synchronized PropertiesUtil getInstance() { if (instance == null) { instance = new PropertiesUtil(); } return instance; } /** * * @param key * @return */ public String getProperty(String key) { return properties.getProperty(key); } /** * 获取属性int值 * @param key * @return */ public Integer getInteger(String key) { String value = properties.getProperty(key); return Integer.valueOf(value); } public static void main(String[] args) { log.info("serverList:"+PropertiesUtil.getInstance().getProperty("standbyServerList")); } }
创建memcache分布式客户端:
package bootstrap; import java.io.IOException; import java.net.InetSocketAddress; import java.util.List; import java.util.concurrent.TimeoutException; import org.slf4j.Logger; import org.slf4j.LoggerFactory; import net.rubyeye.xmemcached.Counter; import net.rubyeye.xmemcached.GetsResponse; import net.rubyeye.xmemcached.MemcachedClient; import net.rubyeye.xmemcached.MemcachedClientBuilder; import net.rubyeye.xmemcached.XMemcachedClientBuilder; import net.rubyeye.xmemcached.exception.MemcachedException; import net.rubyeye.xmemcached.impl.KetamaMemcachedSessionLocator; import net.rubyeye.xmemcached.utils.AddrUtil; import util.PropertiesUtil; /** * Memcached distribution 客户端 * Memcached的分布是通过客户端实现的,客户端根据key的哈希值得到将要存储的memcached节点, * 并将对应的value存储到相应的节点。 * XMemcached同样支持客户端的分布策略,默认分布的策略是按照key的哈希值模以连接数得到的余数, * 对应的连接就是将要存储的节点。如果使用默认的分布策略,你不需要做任何配置或者编程。 * XMemcached同样支持一致性哈希(consistent hash),通过编程设置: * MemcachedClientBuilder builder = new XMemcachedClientBuilder(AddrUtil * .getAddresses(properties.getProperty("test.memcached.servers")) * builder.setSessionLocator(new KetamaMemcachedSessionLocator()); * MemcachedClient client=builder.build(); * 具体一致性哈希算法原理见:http://www.csdn.net/article/2016-03-16/2826609 * XMemcached还提供了额外的一种哈希算法——选举散列,在某些场景下可以替代一致性哈希 * MemcachedClientBuilder builder = new XMemcachedClientBuilder( * AddrUtil.getAddresses("server1:11211 server2:11211 server3:11211")); * builder.setSessionLocator(new ElectionMemcachedSessionLocator()); * MemcachedClient mc = builder.build(); * @author donald * 2017年10月10日 * 下午12:49:45 */ public class MemcachedDistributeClient { private static final Logger log = LoggerFactory.getLogger(MemcachedDistributeClient.class); private static final String MEMCACHED_SERVER_LIST = "distributeServerList"; private static PropertiesUtil propertiesUtil = PropertiesUtil.getInstance(); private static volatile MemcachedDistributeClient instance; private static MemcachedClientBuilder builder; private static MemcachedClient memcachedClient; static{ String distributeServerList = propertiesUtil.getProperty(MEMCACHED_SERVER_LIST); List<InetSocketAddress> serverAddresses = AddrUtil.getAddresses(distributeServerList); builder = new XMemcachedClientBuilder(serverAddresses); builder.setSessionLocator(new KetamaMemcachedSessionLocator()); try { memcachedClient = builder.build(); } catch (IOException e) { log.error("连接异常"); e.printStackTrace(); } } public static synchronized MemcachedDistributeClient getInstance() { if (instance == null) { instance = new MemcachedDistributeClient(); } return instance; } /** * * @param key * @param value * @return */ public boolean set(String key,Object value){ return set(key, 0, value); } /** * * @param key * @param expire 过期时间秒 * @param value * @return */ public boolean set(String key,int expire,Object value){ boolean finish = false; try { finish = memcachedClient.set(key, expire, value); } catch (TimeoutException e) { log.error("set超时"); e.printStackTrace(); } catch (InterruptedException e) { log.error("set中断异常"); e.printStackTrace(); } catch (MemcachedException e) { log.error("set错误"); e.printStackTrace(); } return finish; } /** * * @param key * @param value * @return */ public boolean add(String key,Object value){ return add(key, 0, value); } /** * * @param key * @param expire 过期时间秒 * @param value * @return */ public boolean add(String key,int expire,Object value){ boolean finish = false; try { finish = memcachedClient.add(key, expire, value); } catch (TimeoutException e) { log.error("add超时"); e.printStackTrace(); } catch (InterruptedException e) { log.error("add中断异常"); e.printStackTrace(); } catch (MemcachedException e) { log.error("add错误"); e.printStackTrace(); } return finish; } /** * * @param key * @return */ public Object get(String key){ Object value = null; try { value = memcachedClient.get(key); } catch (TimeoutException e) { log.error("get超时"); e.printStackTrace(); } catch (InterruptedException e) { log.error("get中断异常"); e.printStackTrace(); } catch (MemcachedException e) { log.error("get操作错误"); e.printStackTrace(); } return value; } /** * * @param key * @param appendValue * @return */ public boolean append(String key,Object appendValue){ boolean finish = false; try { finish = memcachedClient.append(key, appendValue); } catch (TimeoutException e) { log.error("append超时"); e.printStackTrace(); } catch (InterruptedException e) { log.error("append中断异常"); e.printStackTrace(); } catch (MemcachedException e) { log.error("append操作错误"); e.printStackTrace(); } return finish; } /** * * @param key * @param prependValue * @return */ public boolean prepend(String key,Object prependValue){ boolean finish = false; try { finish = memcachedClient.prepend(key, prependValue); } catch (TimeoutException e) { log.error("prepend超时"); e.printStackTrace(); } catch (InterruptedException e) { log.error("prepend中断异常"); e.printStackTrace(); } catch (MemcachedException e) { log.error("prepend操作错误"); e.printStackTrace(); } return finish; } /** * * @param key * @param value * @return */ public boolean replace(String key,Object value){ return replace(key, 0, value); } /** * * @param key * @param expire 过期时间秒 * @param value * @return */ public boolean replace(String key,int expire,Object value){ boolean finish = false; try { finish = memcachedClient.replace(key, expire, value); } catch (TimeoutException e) { log.error("replace超时"); e.printStackTrace(); } catch (InterruptedException e) { log.error("replace中断异常"); e.printStackTrace(); } catch (MemcachedException e) { log.error("replace错误"); e.printStackTrace(); } return finish; } /** * * @param key * @param expire * @return */ public boolean touch(String key,int expire){ boolean finish = false; try { finish = memcachedClient.touch(key, expire); } catch (TimeoutException e) { log.error("touch超时"); e.printStackTrace(); } catch (InterruptedException e) { log.error("touch中断异常"); e.printStackTrace(); } catch (MemcachedException e) { log.error("touch操作错误"); e.printStackTrace(); } return finish; } /** * @param key * @param step * @param defalut * @return */ public long incr(String key,long step,long defalut){ long value = 0; try { value = memcachedClient.incr(key, step, defalut); } catch (TimeoutException e) { log.error("incr超时"); e.printStackTrace(); } catch (InterruptedException e) { log.error("incr中断异常"); e.printStackTrace(); } catch (MemcachedException e) { log.error("incr操作错误"); e.printStackTrace(); } return value; } /** * * @param key * @param step * @return */ public long incr(String key,long step){ long value = 0; try { value = memcachedClient.incr(key, step); } catch (TimeoutException e) { log.error("incr超时"); e.printStackTrace(); } catch (InterruptedException e) { log.error("incr中断异常"); e.printStackTrace(); } catch (MemcachedException e) { log.error("incr操作错误"); e.printStackTrace(); } return value; } /** * * @param key * @param step * @return */ public long decr(String key,long step){ long value = 0; try { value = memcachedClient.decr(key, step); } catch (TimeoutException e) { log.error("decr超时"); e.printStackTrace(); } catch (InterruptedException e) { log.error("decr中断异常"); e.printStackTrace(); } catch (MemcachedException e) { log.error("decr操作错误"); e.printStackTrace(); } return value; } /** * * @param key * @return */ public long gets(String key){ long sid = 0; try { GetsResponse<Integer> result = memcachedClient.gets(key); sid = result.getCas(); } catch (TimeoutException e) { log.error("gets超时"); e.printStackTrace(); } catch (InterruptedException e) { log.error("gets中断异常"); e.printStackTrace(); } catch (MemcachedException e) { log.error("gets操作错误"); e.printStackTrace(); } return sid; } /** * * @param key * @param obj * @return */ public boolean cas(String key,Object obj){ boolean finish = false; long sid = gets(key); finish = cas(key, 0, obj, sid); return finish; } /** * * @param key * @param expire * @param obj * @param sid key当前版本id * @return */ public boolean cas(String key, int expire, Object obj, long sid){ boolean finish = false; try { finish = memcachedClient.cas(key, expire, obj, sid); } catch (TimeoutException e) { log.error("cas超时"); e.printStackTrace(); } catch (InterruptedException e) { log.error("cas中断异常"); e.printStackTrace(); } catch (MemcachedException e) { log.error("cas操作错误"); e.printStackTrace(); } return finish; } /** * @param key * @return */ public boolean delete(String key){ boolean finish = false; try { finish = memcachedClient.delete(key); } catch (TimeoutException e) { log.error("delete超时"); e.printStackTrace(); } catch (InterruptedException e) { log.error("delete中断异常"); e.printStackTrace(); } catch (MemcachedException e) { log.error("delete操作错误"); e.printStackTrace(); } return finish; } /** * * @param key * @return */ public void deleteWithNoReply(String key){ try { memcachedClient.deleteWithNoReply(key); } catch (InterruptedException e) { log.error("deleteWithNoReply中断异常"); e.printStackTrace(); } catch (MemcachedException e) { log.error("deleteWithNoReply操作错误"); e.printStackTrace(); } } /** * @param key * @return */ public Counter getCounter(String key) { return getCounter(key,0); } /** * @param key * @param init * @return */ public Counter getCounter(String key,int init) { Counter counter = memcachedClient.getCounter(key,init); return counter; } /** * */ public void flushAll(){ try { memcachedClient.flushAll(); } catch (TimeoutException e) { log.error("flushAll超时"); e.printStackTrace(); } catch (InterruptedException e) { log.error("flushAll中断异常"); e.printStackTrace(); } catch (MemcachedException e) { log.error("flushAll操作错误"); e.printStackTrace(); } } public void shutdown(){ try { memcachedClient.shutdown(); } catch (IOException e) { log.error("客户端关闭异常"); e.printStackTrace(); } } /* (non-Javadoc) * @see java.lang.Object#finalize() */ @Override protected void finalize() { try { memcachedClient.shutdown(); } catch (IOException e) { log.error("memcached 关闭客户端连接失败!"); e.printStackTrace(); } } }
创建测试类:
package bootstrap; import java.util.concurrent.TimeoutException; import org.slf4j.Logger; import org.slf4j.LoggerFactory; import net.rubyeye.xmemcached.Counter; import net.rubyeye.xmemcached.exception.MemcachedException; /** * Memcached 分布式客户端测试类 * @author * donald * 2017年10月10日 * 下午12:49:45 */ public class MemcachedDistributeClientTest { private static final Logger log = LoggerFactory.getLogger(MemcachedDistributeClientTest.class); public static void main(String[] args) { MemcachedDistributeClient memcachedClient = MemcachedDistributeClient.getInstance(); memcachedClient.set("name", 0, "donald"); String value = (String) memcachedClient.get("name"); log.info("set name={}", value); memcachedClient.delete("name"); value = (String) memcachedClient.get("name"); log.info("delete name={}", value); if (!memcachedClient.set("name", 0, "jamel")) { log.error("set error"); } value = (String) memcachedClient.get("name"); log.info("set name={}", value); if (memcachedClient.add("name", 0, "donald")) { log.error("Add error,key is existed"); } value = (String) memcachedClient.get("name"); log.info("name={}", value); if (!memcachedClient.replace("name", 0, "rain")) { log.error("replace error"); } value = (String) memcachedClient.get("name"); log.info("repalce name={}", value); memcachedClient.append("name", "-han"); value = (String) memcachedClient.get("name"); log.info("append name={}", value); memcachedClient.prepend("name", "0-"); value = (String) memcachedClient.get("name"); log.info("prepend name={}", value); memcachedClient.touch("name", 3); try { Thread.sleep(3000); } catch (InterruptedException e) { e.printStackTrace(); } value = (String) memcachedClient.get("name"); log.info("after touch name={}", value); memcachedClient.deleteWithNoReply("name"); memcachedClient.set("age", 0, "27"); log.info("age={}", memcachedClient.get("age")); memcachedClient.incr("age", 2, 1);// age 增加2,age不存在,则为1 memcachedClient.incr("age", 1); log.info("incr age={}", memcachedClient.get("age")); memcachedClient.decr("age", 2); log.info("decr age={}", memcachedClient.get("age")); if (!memcachedClient.cas("age", 27)) { log.error("cas error"); } log.info("cas age={}", memcachedClient.get("age")); Counter counter = memcachedClient.getCounter("counter", 0); try { log.info("incrementAndGet counter,{}", counter.incrementAndGet()); log.info("decrementAndGet counter,{}", counter.decrementAndGet()); log.info("addAndGet counter,{}", counter.addAndGet(3)); } catch (MemcachedException e) { e.printStackTrace(); } catch (InterruptedException e) { e.printStackTrace(); } catch (TimeoutException e) { e.printStackTrace(); } memcachedClient.shutdown(); } }
运行测试类,控制台输出如下:
22:32:41.794 [main] INFO net.rubyeye.xmemcached.XMemcachedClient 729- XMemcachedClient is using Text protocol 22:32:41.841 [main] INFO com.google.code.yanf4j.nio.impl.SelectorManager 37- Creating 4 reactors... 22:32:41.859 [main] INFO com.google.code.yanf4j.core.impl.AbstractController 377- The Controller started at localhost/127.0.0.1:0 ... 22:32:50.918 [Xmemcached-Reactor-0] INFO com.google.code.yanf4j.core.impl.AbstractController 253- Add a session: 192.168.126.128:11211 22:33:00.033 [Xmemcached-Reactor-0] INFO com.google.code.yanf4j.core.impl.AbstractController 253- Add a session: 192.168.126.128:11212 22:33:09.118 [Xmemcached-Reactor-0] INFO com.google.code.yanf4j.core.impl.AbstractController 253- Add a session: 192.168.126.128:11213 22:33:09.185 [main] INFO bootstrap.MemcachedDistributeClientTest 24- set name=donald 22:33:09.196 [main] INFO bootstrap.MemcachedDistributeClientTest 27- delete name=null 22:33:09.202 [main] INFO bootstrap.MemcachedDistributeClientTest 32- set name=jamel 22:33:09.210 [main] INFO bootstrap.MemcachedDistributeClientTest 37- name=jamel 22:33:09.216 [main] INFO bootstrap.MemcachedDistributeClientTest 42- repalce name=rain 22:33:09.221 [main] INFO bootstrap.MemcachedDistributeClientTest 45- append name=rain-han 22:33:09.227 [main] INFO bootstrap.MemcachedDistributeClientTest 48- prepend name=0-rain-han 22:33:12.234 [main] INFO bootstrap.MemcachedDistributeClientTest 56- after touch name=null 22:33:12.240 [main] INFO bootstrap.MemcachedDistributeClientTest 59- age=27 22:33:12.250 [main] INFO bootstrap.MemcachedDistributeClientTest 62- incr age=30 22:33:12.255 [main] INFO bootstrap.MemcachedDistributeClientTest 64- decr age=28 22:33:12.267 [main] INFO bootstrap.MemcachedDistributeClientTest 68- cas age=27 22:33:12.275 [main] INFO bootstrap.MemcachedDistributeClientTest 71- incrementAndGet counter,1 22:33:12.278 [main] INFO bootstrap.MemcachedDistributeClientTest 72- decrementAndGet counter,0 22:33:12.281 [main] INFO bootstrap.MemcachedDistributeClientTest 73- addAndGet counter,3 22:33:12.320 [Xmemcached-Reactor-3] INFO com.google.code.yanf4j.core.impl.AbstractController 368- Remove a session: 192.168.126.128:11212 22:33:12.326 [Xmemcached-Reactor-1] INFO com.google.code.yanf4j.core.impl.AbstractController 368- Remove a session: 192.168.126.128:11213 22:33:12.328 [Xmemcached-Reactor-2] INFO com.google.code.yanf4j.core.impl.AbstractController 368- Remove a session: 192.168.126.128:11211 22:33:12.330 [main] INFO com.google.code.yanf4j.core.impl.AbstractController 486- Controller has been stopped.
从控制台输出来看,与Standby客户端的测试类控制台输出基本没有区别,唯一不同的是,创建了三个会话,三个会话的Memcached实例为:
192.168.126.128:11211 192.168.126.128:11212 192.168.126.128:11213
关闭客户端时,同时关闭了三个会话:
分别连接3个Memcached实例,分别获取name,age,counter属性:
[memcached@donald ~]$ telnet 192.168.126.128 11211 Trying 192.168.126.128... Connected to 192.168.126.128. Escape character is '^]'. get name END get age END get counter VALUE counter 0 1 3 END
Last login: Wed Oct 11 22:22:25 2017 from 192.168.126.1 [memcached@donald ~]$ telnet 192.168.126.128 11212 Trying 192.168.126.128... Connected to 192.168.126.128. Escape character is '^]'. get name END get age END get counter END
[memcached@donald ~]$ telnet 192.168.126.128 11213 Trying 192.168.126.128... Connected to 192.168.126.128. Escape character is '^]'. get name END get age VALUE age 512 1 END get counter END
从上面可以看出,由于我们name属性已经删除,所有name为空,counter在11211上,
age在11213上。
创建测试实例2:
package bootstrap; import java.util.concurrent.TimeoutException; import org.slf4j.Logger; import org.slf4j.LoggerFactory; import net.rubyeye.xmemcached.Counter; import net.rubyeye.xmemcached.exception.MemcachedException; /** * Memcached 分布式客户端测试类 * @author * donald * 2017年10月10日 * 下午12:49:45 */ public class MemcachedDistributeClientTest2 { private static final Logger log = LoggerFactory.getLogger(MemcachedDistributeClientTest2.class); public static void main(String[] args) { MemcachedDistributeClient memcachedClient = MemcachedDistributeClient.getInstance(); memcachedClient.flushAll(); memcachedClient.set("name", 0, "donald"); String value = (String) memcachedClient.get("name"); log.info("set name={}", value); memcachedClient.set("age", 0, "27"); log.info("age={}", memcachedClient.get("age")); memcachedClient.incr("age", 1); log.info("incr age={}", memcachedClient.get("age")); Counter counter = memcachedClient.getCounter("counter", 0); try { log.info("incrementAndGet counter,{}", counter.incrementAndGet()); log.info("decrementAndGet counter,{}", counter.decrementAndGet()); log.info("addAndGet counter,{}", counter.addAndGet(3)); } catch (MemcachedException e) { e.printStackTrace(); } catch (InterruptedException e) { e.printStackTrace(); } catch (TimeoutException e) { e.printStackTrace(); } memcachedClient.shutdown(); } }
运行测试类控制台输出:
22:53:04.215 [main] INFO net.rubyeye.xmemcached.XMemcachedClient 729- XMemcachedClient is using Text protocol 22:53:04.257 [main] INFO com.google.code.yanf4j.nio.impl.SelectorManager 37- Creating 4 reactors... 22:53:04.275 [main] INFO com.google.code.yanf4j.core.impl.AbstractController 377- The Controller started at localhost/127.0.0.1:0 ... 22:53:13.334 [Xmemcached-Reactor-0] INFO com.google.code.yanf4j.core.impl.AbstractController 253- Add a session: 192.168.126.128:11211 22:53:22.375 [Xmemcached-Reactor-0] INFO com.google.code.yanf4j.core.impl.AbstractController 253- Add a session: 192.168.126.128:11212 22:53:31.397 [Xmemcached-Reactor-0] INFO com.google.code.yanf4j.core.impl.AbstractController 253- Add a session: 192.168.126.128:11213 22:53:31.544 [main] INFO bootstrap.MemcachedDistributeClientTest2 25- set name=donald 22:53:31.553 [main] INFO bootstrap.MemcachedDistributeClientTest2 27- age=27 22:53:31.562 [main] INFO bootstrap.MemcachedDistributeClientTest2 29- incr age=28 22:53:31.570 [main] INFO bootstrap.MemcachedDistributeClientTest2 32- incrementAndGet counter,1 22:53:31.573 [main] INFO bootstrap.MemcachedDistributeClientTest2 33- decrementAndGet counter,0 22:53:31.578 [main] INFO bootstrap.MemcachedDistributeClientTest2 34- addAndGet counter,3 22:53:31.625 [Xmemcached-Reactor-1] INFO com.google.code.yanf4j.core.impl.AbstractController 368- Remove a session: 192.168.126.128:11213 22:53:31.629 [Xmemcached-Reactor-2] INFO com.google.code.yanf4j.core.impl.AbstractController 368- Remove a session: 192.168.126.128:11211 22:53:31.631 [Xmemcached-Reactor-3] INFO com.google.code.yanf4j.core.impl.AbstractController 368- Remove a session: 192.168.126.128:11212 22:53:31.632 [main] INFO com.google.code.yanf4j.core.impl.AbstractController 486- Controller has been stopped.
分别连接3个Memcached实例,分别获取name,age,counter属性:
[memcached@donald ~]$ telnet 192.168.126.128 11211 Trying 192.168.126.128... Connected to 192.168.126.128. Escape character is '^]'. get name END get age END get counter VALUE counter 0 1 3 END [memcached@donald ~]$ telnet 192.168.126.128 11212 Trying 192.168.126.128... Connected to 192.168.126.128. Escape character is '^]'. get name END get age END get counter END quit [memcached@donald ~]$ telnet 192.168.126.128 11212 Trying 192.168.126.128... Connected to 192.168.126.128. Escape character is '^]'. get name END get age END get counter END [memcached@donald ~]$ telnet 192.168.126.128 11213 Trying 192.168.126.128... Connected to 192.168.126.128. Escape character is '^]'. get name VALUE name 0 6 donald END get age VALUE age 0 2 28 END get counter END
从上面可以看出,name,age,counter分布在11211,11212,11213上。
评论
1 楼
flyfeifei66
2018-07-09
打算使用xmemcache作为memcache的客户端,由于xmemcache是基于NIO的异步多路复用IO技术,网上的资料都说只需要一个客户端连接即可(线程安全?)。做法基本就是实例化出来XMemcachedClientBuilder,然后利用这个builder创建一个memcachedClient就可以操作缓存了。
在其他资料上看到并发量大时一个连接性能也是有问题的,容易timeout,其实也可以用多个client。且XMemcachedClientBuilder确实有个setConnectionPoolSize方法。但是我看了下XMemcachedClientBuilder确没有其他的设置参数的方法,一个真正意义上的池化技术,至少得有连接最大数,默认初始数量,最大空闲等配置,还得有资源的回收/释放方法,我找了下这些XMemcachedClientBuilder统统没有。并且memcachedClient也没有close 、disconnect类似的方法?难道XMemcachedClientBuilder只是个伪池子?设置PoolSize仅仅是设置它能生产client的最大数量,然后自己没有管理这些client的功能?
我尝试读了下源码,看的非常晕,没找到头绪
另外就是服务器的参数顺序不同,一个度一个写是否会有问题?
在其他资料上看到并发量大时一个连接性能也是有问题的,容易timeout,其实也可以用多个client。且XMemcachedClientBuilder确实有个setConnectionPoolSize方法。但是我看了下XMemcachedClientBuilder确没有其他的设置参数的方法,一个真正意义上的池化技术,至少得有连接最大数,默认初始数量,最大空闲等配置,还得有资源的回收/释放方法,我找了下这些XMemcachedClientBuilder统统没有。并且memcachedClient也没有close 、disconnect类似的方法?难道XMemcachedClientBuilder只是个伪池子?设置PoolSize仅仅是设置它能生产client的最大数量,然后自己没有管理这些client的功能?
我尝试读了下源码,看的非常晕,没找到头绪
另外就是服务器的参数顺序不同,一个度一个写是否会有问题?
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