代码之家 › 专栏 › 技术社区 › jckdnk111

MycCurp用Python获得字符串集的NULL,然后从Java获取

memcached python java

jckdnk111 · 技术社区 · 14 年前

当我试图从memcached读取我在python中设置的字符串时:

import memcache

MC_SERVER = "192.168.1.100"
MC_PORT = "11211"

mc = memcache.Client(['%s:%s' % (MC_SERVER, MC_PORT)], debug=0)
mc.set("test_string", "true")
print mc.get("test_string")

Java告诉我是不存在的,当我试图得到它时,它显然是空的:

import com.danga.MemCached.*;
public class Tester {

        // create a static client as most installs only need
        // a single instance
        protected static MemCachedClient mcc = new MemCachedClient(true, false);

        // set up connection pool once at class load
        static {

                // server list and weights
                String[] servers =
                        {
                          "192.168.1.100:11211"
                        };

                // grab an instance of our connection pool
                SockIOPool pool = SockIOPool.getInstance();

                // set the servers and the weights
                pool.setServers( servers );

                // set some TCP settings
                // disable nagle
                // set the read timeout to 3 secs
                // and don't set a connect timeout
                pool.setNagle( false );
                pool.setSocketTO( 3000 );
                pool.setSocketConnectTO( 0 );

                // initialize the connection pool
                pool.initialize();
        }

        // from here on down, you can call any of the client calls
        public static void main(String[] args) {
                //System.out.println( mcc.set( "test_string", "blah!" ) ); // everything is great is value is set by Java
                System.out.println( mcc.keyExists( "test_string" ) ); // output is false when value set by python
                System.out.println( mcc.get( "test_string" ) ); // output is null when value set by python
        }
}

我猜这可能与跨语言的对象序列化/取消序列化有关,但我想我可以使用简单的字符串-以前有人遇到过这种情况吗?

以下是我正在使用的libs:

http://www.tummy.com/Community/software/python-memcached/

http://github.com/gwhalin/Memcached-Java-Client/downloads

5 回复 | 直到 9 年前

Dmytro Leonenko 14 年前

文档中的解决方案:

如果需要支持多个客户端(即Java、PHP、Perl等) 你需要做一些改变你在设置:

// use a compatible hashing algorithm
pool.setHashingAlg( SockIOPool.NEW_COMPAT_HASH );

// store primitives as strings
// the java client serializes primitives
//
// note: this will not help you when it comes to
// storing non primitives
mcc.setPrimitiveAsString( true );

// donât url encode keys
// by default the java client url encodes keys
// to sanitize them so they will always work on the server
// however, other clients do not do this
mcc.setSanitizeKeys( false );

user4179639 9 年前

更改为使用 pylibmc 解决它:

import pylibmc

mc = pylibmc.Client(["127.0.0.1"], binary=True,
                   behaviors={"tcp_nodelay": True,
                               "ketama": True})

key="someKey"
i=0
while True:
    #mc.set(key, str(i))
    value = mc.get(key)
    print(value)
    sleep(1)
    i+=1

Simon Callan 14 年前

Java不使用Unicode吗?如果是这样,我怀疑python正在使用ascii/latin 1字符集写入memcache。因此,键看起来非常不同(“test_string”与“t\00e\00s\00t\00s\00t\00r\00i\00n\00g\00”)。

试着用这个,看看会发生什么。

import memcache

MC_SERVER = "192.168.1.100"
MC_PORT = "11211"

mc = memcache.Client(['%s:%s' % (MC_SERVER, MC_PORT)], debug=0)
mc.set(u"test_string", u"true")
print mc.get(u"test_string")

Nishant Nawarkhede 10 年前

确保 memcached 服务已启动,如果它已启动,则重新启动服务。

sibnick 9 年前

它是Java客户端中的bug。您应该获得带有修复的分叉项目: https://github.com/zmokhtar/Memcached-Java-Client

编辑

我可以用GWHALIN /MeMcCaskJava客户端复制问题,但是ZMKHTAR/MeMcCaskJava客户端的一切都很好