java - 启用 stomp 后的 activemq oom

Question

在 Activemq 服务器上启用 STOMP 协议(protocol)(​​之前仅启用默认协议(protocol))后，它开始因 oom 而失败。我只有 1 个客户使用 STOMP。它可以工作 1 周而不会失败或在重新启动后一天失败。这是配置文件:

<beans
  xmlns="http://www.springframework.org/schema/beans"
  xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
  xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
  http://activemq.apache.org/schema/core http://activemq.apache.org/schema/core/activemq-core.xsd">

    <bean id="logQuery" class="io.fabric8.insight.log.log4j.Log4jLogQuery"
          lazy-init="false" scope="singleton"
          init-method="start" destroy-method="stop">
    </bean>

    <!--
        The <broker> element is used to configure the ActiveMQ broker.
    -->
    <broker useJmx="true" xmlns="http://activemq.apache.org/schema/core" brokerName="cms-mq" dataDirectory="${activemq.data}">

        <destinationInterceptors>
            <virtualDestinationInterceptor>
                <virtualDestinations>
                    <virtualTopic name="VirtualTopic.>" selectorAware="true"/>
                </virtualDestinations>
            </virtualDestinationInterceptor>
        </destinationInterceptors>

        <destinationPolicy>
            <policyMap>
              <policyEntries>
                <policyEntry topic=">" producerFlowControl="false">
                </policyEntry>
                <policyEntry queue=">" producerFlowControl="false">
                </policyEntry>
              </policyEntries>
            </policyMap>
        </destinationPolicy>

        <managementContext>
            <managementContext createConnector="false"/>
        </managementContext>
        <persistenceAdapter>
            <kahaDB directory="${activemq.data}/kahadb"/>
        </persistenceAdapter>
          <systemUsage>
            <systemUsage>
                <memoryUsage>
                    <memoryUsage percentOfJvmHeap="70" />
                </memoryUsage>
                <storeUsage>
                    <storeUsage limit="4 gb"/>
                </storeUsage>
                <tempUsage>
                    <tempUsage limit="4 gb"/>
                </tempUsage>
            </systemUsage>
        </systemUsage>

        <transportConnectors>
            <transportConnector name="auto" uri="auto+nio://0.0.0.0:61616?maximumConnections=1000&amp;auto.protocols=default,stomp"/>
        </transportConnectors>
        <shutdownHooks>
            <bean xmlns="http://www.springframework.org/schema/beans" class="org.apache.activemq.hooks.SpringContextHook" />
        </shutdownHooks>

        <plugins>
          ... security plugins config...
        </plugins>

    </broker>

    <import resource="jetty.xml"/>

</beans>

开始参数:

/usr/java/default/bin/java -Xms256M -Xmx1G -Dorg.apache.activemq.UseDedicatedTaskRunner=false -XX:HeapDumpPath=/var/logs/heapDumps -XX:+HeapDumpOnOutOfMemoryError -Dcom.sun.management.jmxremote.port=8162 -Dcom.sun.management.jmxremote.rmi.port=8162 -Dcom.sun.management.jmxremote.password.file=/opt/apache-activemq-5.13.0//conf/jmx.password -Dcom.sun.management.jmxremote.access.file=/opt/apache-activemq-5.13.0//conf/jmx.access -Dcom.sun.management.jmxremote.ssl=false -Dcom.sun.management.jmxremote -Djava.awt.headless=true -Djava.io.tmpdir=/opt/apache-activemq-5.13.0//tmp -Dactivemq.classpath=/opt/apache-activemq-5.13.0//conf:/opt/apache-activemq-5.13.0//../lib/ -Dactivemq.home=/opt/activemq -Dactivemq.base=/opt/activemq -Dactivemq.conf=/opt/apache-activemq-5.13.0//conf -Dactivemq.data=/opt/apache-activemq-5.13.0//data -jar /opt/activemq/bin/activemq.jar start

更新:来自 Eclipse MemoryAnalizer:

Leak Suspects
247,036 instances of "org.apache.activemq.command.ActiveMQBytesMessage", loaded by "java.net.URLClassLoader @ 0xc02e9470" occupy 811,943,360 (76.92%) bytes. 

81 instances of "org.apache.activemq.broker.region.cursors.FilePendingMessageCursor", loaded by "java.net.URLClassLoader @ 0xc02e9470" occupy 146,604,368 (13.89%) bytes.

更新:在出现 OOM 错误之前，日志中有几个错误，如下所示:

| ERROR | Could not accept connection from null: java.lang.IllegalStateException: Timer already cancelled. | org.apache.activemq.broker.TransportConnector | ActiveMQ BrokerService[cms-mq] Task-13707
| INFO  | The connection to 'null' is taking a long time to shutdown. | org.apache.activemq.broker.TransportConnection | ActiveMQ BrokerService[cms-mq] Task-13738

希望在调试方面提供任何帮助。如果需要，可以提供其他信息。

Answer 1

一种猜测是，您正在通过 STOMP 向代理发送来自生产者的消息，并最终耗尽代理内存。您已经关闭了生产者流量控制，即使是默认的 JMS 客户端也可能导致这种情况，而 STOMP 更容易进入这种情况，因为默认情况下没有返回生产者的确认以允许流量控制机制，您必须在每次发送时要求收据。

要对此进行调试，您需要通过控制台或您选择的其他工具开始检查您的代理日志以及目的地和使用情况统计信息，以查看代理的状态。