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[Java教程]ActiveMQ笔记:搭建Broker集群(cluster)


上一篇介绍了基于Networks of Borkers的2节点HA方案,这一篇继续来折腾Networks of Brokers,当应用规模日渐增长时,2节点的broker可能仍然抗不住访问压力,这时候就需要多加一些broker,弄一个更大规模的Broker集群,但是怎么合理设置broker之间的网络桥接,却是有讲究的,先来看一种不太好的设计:

 

这个架构看上去没瑕疵,没毛病,3个broker之间两两互通,整体可用性极高,但是从消息的路由角度来看,却不是一个好的设计,当producer向broker1发送一条消息时,Consumer得到消息的路径可能有如下2条:

a) producer -> broker1 -> broker2 

b) producer -> broker1 -> broker3 -> broker2  

当broker更多时,情况会更复杂,比如下面这张图:

消息的路由途径将会更多:

a) producer -> broker1 -> broker4

b) producer -> broker1 -> broker2 -> broker4

c) producer -> broker1 -> broker2 -> broker3 -> broker4

d) producer -> broker1 -> broker3 -> broker4

不难想像,每多经过一个节点,消息处理的延时将会增加一些,如果Broker越多,情况越复杂,最终系统对外表现为消息处理有时很快,有时很慢,整体性能很不稳定,所以实际生产中,不要采用所有Broker之间两两互连的方案。

合理的方案如下:

这张图的灵感,应该来自组建局域网中的星形网络,在中心放置一个Borker充当Hub,与其它所有Broker互连,这样不管Consumer连接到外围的哪个Broker,消息的路由途径都比较稳定(最多经过3个Broker),这种架构性能虽然稳定了,但是中心的Hub就变成单点隐患,如果中间的DockerHub挂了,整个系统也就废了。

改进后的架构如下:

本质上仍然是一个星形网络,只不过将hub弄成二个互备,然后每个hub都与其它外围的broker相连,消费者连接到broker1/broker2/broker3,生产者(Producer)连接到hub1/hub2,消息的最长路径不超过3个broker (注:生产者也可以连接到broker1/2/3,与消费者一样,但是消息经过的最长路径会变成4)

如果以后要扩张,比如增加了Broker4,Broker5...,直接修改hub1/2上的配置,增加与新的broker的连接即可,不影响消息的路由途径长度。

最后,在本机演练一把,给出一些配置示例:

1、端口规划

activemq1: 61616 (broker1)activemq2: 61626 (broker2)activemq3: 61636 (broker3)activemq4: 61646 (broker-hub1)activemq5: 61656 (broker-hub2)

共5个activemq实例,端口61616、61626、61636为broker1、broker2、broker3,61645、61656为broker-hub1、broker-hub2

2、activemq.

以boker1为例,配置文件内容如下:

 1 <beans 2     ="http://www.springframework.org/schema/beans" 3     ="http://www.w3.org/2001/ 4     xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd 5  http://activemq.apache.org/schema/core http://activemq.apache.org/schema/core/activemq-core.xsd"> 6  7  <bean class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer"> 8   <property name="locations"> 9    <value>file:${activemq.conf}/credentials.properties</value>10   </property>11  </bean>12 13  <broker ="http://activemq.apache.org/schema/core" brokerName="broker1"> 14   <persistenceAdapter>15    <kahaDB directory="${activemq.data}/kahadb"/>16   </persistenceAdapter>17   <transportConnectors>18    <transportConnector name="openwire"19              uri="tcp://0.0.0.0:61616?maximumConnections=1000&amp;wireFormat.maxFrameSize=104857600"/>20   </transportConnectors>21  </broker>22 23  <import resource="jetty./>24 </beans>

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broker2及broker3,大家参考该配置修改端口号及brokerName即可。

broker-hub1的配置:

 1 <beans 2     ="http://www.springframework.org/schema/beans" 3     ="http://www.w3.org/2001/ 4     xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd 5  http://activemq.apache.org/schema/core http://activemq.apache.org/schema/core/activemq-core.xsd"> 6  7  <bean class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer"> 8   <property name="locations"> 9    <value>file:${activemq.conf}/credentials.properties</value>10   </property>11  </bean>12 13  <broker ="http://activemq.apache.org/schema/core" brokerName="broker-hub1">14   <networkConnectors>15    <networkConnector uri="static:(tcp://127.0.0.1:61656,tcp://127.0.0.1:61616,tcp://127.0.0.1:61626,tcp://127.0.0.1:61636)" duplex="true"/>   16   </networkConnectors>17   <persistenceAdapter>18    <kahaDB directory="${activemq.data}/kahadb"/>19   </persistenceAdapter>20   <transportConnectors>21    <transportConnector name="openwire"22              uri="tcp://0.0.0.0:61646?maximumConnections=1000&amp;wireFormat.maxFrameSize=104857600"/>23   </transportConnectors>24  </broker>25 26  <import resource="jetty./>27 </beans>

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broker-hub2的配置:

 1 <beans 2     ="http://www.springframework.org/schema/beans" 3     ="http://www.w3.org/2001/ 4     xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd 5  http://activemq.apache.org/schema/core http://activemq.apache.org/schema/core/activemq-core.xsd"> 6  7  <bean class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer"> 8   <property name="locations"> 9    <value>file:${activemq.conf}/credentials.properties</value>10   </property>11  </bean>12 13  <broker ="http://activemq.apache.org/schema/core" brokerName="broker-hub2">14   <networkConnectors>  15    <networkConnector uri="static:(tcp://127.0.0.1:61616,tcp://127.0.0.1:61626,tcp://127.0.0.1:61636)" duplex="true"/>16   </networkConnectors>17   <persistenceAdapter>18    <kahaDB directory="${activemq.data}/kahadb"/>19   </persistenceAdapter>20   <transportConnectors>21    <transportConnector name="openwire"22              uri="tcp://0.0.0.0:61656?maximumConnections=1000&amp;wireFormat.maxFrameSize=104857600"/>23   </transportConnectors>24  </broker>25 26  <import resource="jetty./>27 </beans>

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3、java代码中spring配置文件

a) 生产者

 1 <bean id="jmsFactory" class="org.apache.activemq.pool.PooledConnectionFactory" destroy-method="stop"> 2   <property name="connectionFactory"> 3     <bean class="org.apache.activemq.ActiveMQConnectionFactory"> 4       <!--broker服务的地址--> 5       <property name="brokerURL" value="failover:(tcp://localhost:61646,tcp://localhost:61656)"/> 6       <!--默认值为1000,如果不需要这么大,可以调小--> 7       <property name="maxThreadPoolSize" value="100"/> 8       <!--<property name="userName" value="system"/>--> 9       <!--<property name="password" value="manager"/>-->10     </bean>11   </property>12 </bean>

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b) 消费者

 1 <bean id="jmsFactory" class="org.apache.activemq.pool.PooledConnectionFactory" destroy-method="stop"> 2   <property name="connectionFactory"> 3     <bean class="org.apache.activemq.ActiveMQConnectionFactory"> 4       <!--broker服务的地址--> 5       <property name="brokerURL" value="failover:(tcp://localhost:61616,tcp://localhost:61626,tcp://localhost:61636)"/> 6       <!--默认值为1000,如果不需要这么大,可以调小--> 7       <property name="maxThreadPoolSize" value="100"/> 8       <!--<property name="userName" value="system"/>--> 9       <!--<property name="password" value="manager"/>-->10     </bean>11   </property>12 </bean>

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参考文章:

http://www.jakubkorab.net/2011/11/understanding-activemq-broker-networks.html

http://activemq.apache.org/networks-of-brokers.html