Memcached 学习笔记 多节点测试

一，启动两个（或者多个）节点：

memcached -d -p 11212 -u nobody -c 1024 -m 64
memcached -d -p 11213 -u nobody -c 1024 -m 64

memcached -d -p 11212 -u nobody -c 1024 -m 64
memcached -d -p 11213 -u nobody -c 1024 -m 64

查看一下进程树：



二，用Ruby测试多个memcached节点：

$KCODE='u'

require "rubygems"
require "memcache"
require "logger"

server=['localhost:11211','localhost:11212','localhost:11213']
option={
:logger=>Logger.new(STDOUT)
}

cache=MemCache.new(server,option)

cache['key1']=123
cache['key2']="ABCDE"
cache['key3']=%w(hoge fuga)
cache['key4']={:foo=>1,:bar=>"a"}

p cache['key1']
p cache['key2']
p cache['key3']
p cache['key4']

$KCODE='u'

require "rubygems"
require "memcache"
require "logger"

server=['localhost:11211','localhost:11212','localhost:11213']
option={
:logger=>Logger.new(STDOUT)
}

cache=MemCache.new(server,option)

cache['key1']=123
cache['key2']="ABCDE"
cache['key3']=%w(hoge fuga)
cache['key4']={:foo=>1,:bar=>"a"}

p cache['key1']
p cache['key2']
p cache['key3']
p cache['key4']

其运行结果如下图：



从图中可以看到，对于多个节点的测试，图中红色部分key2,key3都写入11211节点中；绿色部分key1写入到11212节点中，蓝色部分key4写入到了11213节点中。

三，模拟失去一个节点

[ruby]
view plaincopyprint?

require "rubygems"
require "memcache"
require "logger"

server=['localhost:11212','localhost:11213']
option={
:logger=>Logger.new(STDOUT)
}

cache=MemCache.new(server,option)

cache['key1']=123
cache['key2']="ABCDE"
cache['key3']=%w(hoge fuga)
cache['key4']={:foo=>1,:bar=>"a"}

p cache['key1']
p cache['key2']
p cache['key3']
p cache['key4']

require "rubygems"
require "memcache"
require "logger"

server=['localhost:11212','localhost:11213']
option={
:logger=>Logger.new(STDOUT)
}

cache=MemCache.new(server,option)

cache['key1']=123
cache['key2']="ABCDE"
cache['key3']=%w(hoge fuga)
cache['key4']={:foo=>1,:bar=>"a"}

p cache['key1']
p cache['key2']
p cache['key3']
p cache['key4']

在上面的代码中，我们在

[ruby]
view plaincopyprint?

server=['localhost:11212','localhost:11213']

server=['localhost:11212','localhost:11213']

去掉了一个节点'localhost:11211'，执行结果如下图：



可以看到，当丢掉一个节点后，key1,key2,key3的数据都写到了11212节点上，key4的值写到了11213节点上。