Memcached通过python为String设置为null,然后从Java获取 [英] Memcached getting null for String set with python and then get from Java
问题描述
当我尝试从我在python中设置的memcached中读取字符串时:
When I try to read a String from memcached that I set in python:
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告诉我它不存在,当我试图得到它时显然会返回null:
Java tells me is doesn't exist and obviously returns null when I try to get it:
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
}
}
I我猜它与跨语言的对象序列化/非序列化有关但我觉得我对简单的字符串可能没问题 - 以前有人碰到这个吗?
I am guessing it has something to do with the Object serialization / un-serialization across languages but I thought I might be OK for simple Strings - anyone run into this before?
这里是我正在使用的库:
Here are the libs I am using:
http://www.tummy.com/Community/software/python-memcached/
http://github.com/gwhalin/Memcached-Java-Client/downloads
推荐答案
解决方案直接来自文档:
The solution right from documentation:
如果你需要支持多个
客户端(即Java,PHP,Perl等)
当您设置
时需要进行一些更改:
If you need to support multiple clients (i.e. Java, PHP, Perl, etc.) you need to make a few changes when you are setting things up:
// 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 );
// don’t 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 );
这篇关于Memcached通过python为String设置为null,然后从Java获取的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持IT屋!