ActiveMq优化

最近在研究ActiveMq，期间也遇到过很多问题，做了一些总结。

连接数配置

修改activemq.xml文件中maximumConnections参数值，默认最大连接为1000。


<transportConnectors>
    <!-- DOS protection, limit concurrent connections to 1000 and frame size to 100MB -->
    <transportConnector name="openwire" uri="tcp://0.0.0.0:61616?maximumConnections=1000&amp;wireFormat.maxFrameSize=104857600"/>
    <transportConnector name="amqp" uri="amqp://0.0.0.0:5672?maximumConnections=1000&amp;wireFormat.maxFrameSize=104857600"/>
    <transportConnector name="stomp" uri="stomp://0.0.0.0:61613?maximumConnections=1000&amp;wireFormat.maxFrameSize=104857600"/>
    <transportConnector name="mqtt" uri="mqtt://0.0.0.0:1883?maximumConnections=100000&amp;wireFormat.maxFrameSize=104857600"/>
    <transportConnector name="ws" uri="ws://0.0.0.0:61614?maximumConnections=1000&amp;wireFormat.maxFrameSize=104857600"/>
</transportConnectors>

如果超出最大连接限制，会提示以下错误！

org.apache.activemq.transport.tcp.ExceededMaximumConnectionsException: Exceeded the maximum number of allowed client connections. See the 'maximumConnections' property on the TCP transport configuration URI in the ActiveMQ configuration file (e.g., activemq.xml)
	at org.apache.activemq.transport.tcp.TcpTransportServer.doHandleSocket(TcpTransportServer.java:582)[activemq-client-5.15.6.jar:5.15.6]
	at org.apache.activemq.transport.tcp.TcpTransportServer.handleSocket(TcpTransportServer.java:571)[activemq-client-5.15.6.jar:5.15.6]
	at org.apache.activemq.transport.tcp.TcpTransportServer$1.run(TcpTransportServer.java:497)[activemq-client-5.15.6.jar:5.15.6]
	at java.lang.Thread.run(Thread.java:748)[:1.8.0_181]