memcached演练(4) 使用apache+memcached-session-manager+tomcat集群（续）

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memcached演练(4) 使用apache+memcached-session-manager+tomcat集群，存在一些问题。问题列表
问题1：2个tomcat节点，apache,memcached服务器均放在一个虚拟机，不能真正模拟真实环境。
问题2：不能整整模拟分布式环境。
本文，重新设计下物理结构。沿用《memcached演练(4) 使用apache+memcached-session-manager+tomcat集群》配置。仅仅将主机进行了调整。


操作步骤。
1.将配置好的tomcat节点分别复制到 2个主机

1 2	scp -r apache-tomcat-node1 root@hadoop2:/u01 scp -r apache-tomcat-node2 root@hadoop3:/u01

2.修改apache的worker.properties

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[iyunv@hadoop1 /]# vi /etc/httpd/conf/workers.properties worker.list=loadbalancer worker.tomcat1.port=8009 worker.tomcat1.host=192.168.163.156 worker.tomcat1.type=ajp13 worker.tomcat1.lbfactor=1 worker.tomcat2.port=8019 worker.tomcat2.host=192.168.163.166 worker.tomcat2.type=ajp13 worker.tomcat2.lbfactor=1 worker.loadbalancer.type=lb worker.loadbalancer.balance_workers=tomcat1,tomcat2 worker.loadbalancer.sticky_session=true

3.修改每个节点的tomcat的context相关MSM配置

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<Manager className="de.javakaffee.web.msm.MemcachedBackupSessionManager"       memcachedNodes="n1:192.168.163.146:11211" sticky="false"       requestUriIgnorePattern=".*\.(ico|png|gif|jpg|css|js)$" />

指向192.168.163.146:11211

4.测试下吞吐量

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c:\Apache24\bin>ab  -n 10000 -c 4  http://192.168.163.146/examples/testSession.jsp This is ApacheBench, Version 2.3 <$Revision: 1604373 $> Copyright 1996 Adam Twiss, Zeus Technology Ltd, http://www.zeustech.net/ Licensed to The Apache Software Foundation, http://www.apache.org/ Benchmarking 192.168.163.146 (be patient) Completed 1000 requests ... Completed 10000 requests Finished 10000 requests Server Software:        Apache/2.2.15 Server Hostname:        192.168.163.146 Server Port:            80 Document Path:          /examples/testSession.jsp Document Length:        331 bytes Concurrency Level:      4 Time taken for tests:   10.322 seconds Complete requests:      10000 Failed requests:        0 Total transferred:      5930000 bytes HTML transferred:       3310000 bytes Requests per second:    968.84 [#/sec] (mean) Time per request:       4.129 [ms] (mean) Time per request:       1.032 [ms] (mean, across all concurrent requests) Transfer rate:          561.06 [Kbytes/sec] received Connection Times (ms)               min  mean[+/-sd] median   max Connect:        0    0   0.4      1       5 Processing:     0    4  11.7      3     585 Waiting:        0    4  11.7      3     585 Total:          0    4  11.7      3     585 ERROR: The median and mean for the initial connection time are more than twice the standard        deviation apart. These results are NOT reliable.

吞吐量：968.84。比上节中的测试结果“727.55”超出不少。
经过多次测试，差别有点大。
Requests per second:    1281.74 [#/sec] (mean)

Requests per second:    1451.22 [#/sec] (mean)

模拟一台节点宕机情况，测试吞吐量

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c:\Apache24\bin>ab  -n 10000 -c 4  http://192.168.163.146/examples/testSession.jsp This is ApacheBench, Version 2.3 <$Revision: 1604373 $> Copyright 1996 Adam Twiss, Zeus Technology Ltd, http://www.zeustech.net/ Licensed to The Apache Software Foundation, http://www.apache.org/ Benchmarking 192.168.163.146 (be patient) Completed 1000 requests ... Finished 10000 requests Server Software:        Apache/2.2.15 Server Hostname:        192.168.163.146 Server Port:            80 Document Path:          /examples/testSession.jsp Document Length:        331 bytes Concurrency Level:      4 Time taken for tests:   7.994 seconds Complete requests:      10000 Failed requests:        0 Total transferred:      5930000 bytes HTML transferred:       3310000 bytes Requests per second:    1250.92 [#/sec] (mean) Time per request:       3.198 [ms] (mean) Time per request:       0.799 [ms] (mean, across all concurrent requests) Transfer rate:          724.41 [Kbytes/sec] received

吞吐量：1250.92。FUCK出乎意料啊。竟然比2个节点的情况下还高。
多次测试，发现均在1700左右。

Requests per second:    1729.64 [#/sec] (mean)
Requests per second:    1779.67 [#/sec] (mean)。

结果出乎我的意料。 记住这个结果，以后做个监控分析下。