java - ActiveMQ 传输 : tcp: Thread RUNNABLE state - too many threads hanging

Question

下面的 ActiveMQ 实现存在于代码中。有时，系统停止工作并变得非常缓慢。当我使用 JavaMelody 检查线程转储时 - 我看到太多线程长时间处于 Runnable 状态并且没有被终止。

ActiveMQ 版本 - activemq-all-5.3.0.jar

请引用以下代码:

经纪人:

public class ActiveMQ extends HttpServlet {

private static final long serialVersionUID = -1234568008764323456;
private static final Logger logger = Logger.getLogger(ActiveMQ.class.getName());
public Listener listener;

private String msgBrokerUrl = "tcp://localhost:61602";
public BrokerService broker = null;
public TransportConnector connector = null;

@Override
public void init() throws ServletException {

    try {
        broker = new BrokerService();
        broker.setPersistent(false);
        broker.setUseJmx(false);
        connector = broker.addConnector(msgBrokerUrl);
        broker.setUseShutdownHook(true);
        System.out.println("BROKER LOADED");
        broker.start();
        broker.deleteAllMessages();

        listener = new Listener();

    } catch (Exception e) {
        e.printStackTrace();
    }
}

听众:

public class Listener implements MessageListener {

private String msgQueueName = "jms/queue/MessageQueue";
public Session session;
public Destination adminQueue;

public static String id;

public ActiveMQConnection connection;
public MessageConsumer consumer = null;

public Listener() {
    try {

        ActiveMQConnectionFactory connectionFactory = new ActiveMQConnectionFactory(
                new URI("failover://(" + "tcp://localhost:61602" + "?wireFormat.cacheEnabled=false"
                        + "&wireFormat.maxInactivityDuration=0&wireFormat.tightEncodingEnabled=true)?maxReconnectDelay=1000"));

        connection = (ActiveMQConnection) connectionFactory.createConnection();
        connection.start();
        session = connection.createSession(false, Session.AUTO_ACKNOWLEDGE);
        adminQueue = session.createQueue(msgQueueName);
        id = new Timestamp(new Date().getTime()).toString();
        consumer = this.session.createConsumer(this.adminQueue, "ID='" + id + "'");
        consumer.setMessageListener(this);
    } catch (JMSException e) {
        e.printStackTrace();
    } catch (Exception e) {
        e.printStackTrace();
    }
}

@SuppressWarnings("unchecked")
@Override
public void onMessage(Message message) {
    TextMessage msg = (TextMessage) message;
    try {
        String xmlMsg = msg.getText();
        // business logic
    } catch (JMSException ex) {
        ex.printStackTrace();
    } catch (Exception e) {
        e.printStackTrace();
    }
}

制作人:

public class Producer {
private static String url = "tcp://localhost:61602";
private static String msgQueueName = "jms/queue/MessageQueue";

public ConnectionFactory connectionFactory = null;
public Connection connection = null;
public Session session = null;
public Destination destination = null;

public Producer() {
    connectionFactory = new ActiveMQConnectionFactory(url);
}

public void sendResponse(String xml, DataBean objDataBean) {
    sendToQueue(xml, msgQueueName, objDataBean);
}

private void sendToQueue(String xml, String msgQueueName, DataBean obj) {

    try {
        Connection connection = connectionFactory.createConnection();
        connection.start();
        Session session = connection.createSession(false, Session.AUTO_ACKNOWLEDGE);
        Destination destination = session.createQueue(msgQueueName);
        MessageProducer producer = session.createProducer(destination);
        TextMessage message = session.createTextMessage(xml);
        message.setJMSExpiration(1000);
        message.setStringProperty(obj.getMsgKey(), obj.getMsgValue());
        producer.send(message);

        xml = null;
        session.close();
        connection.close();

    } catch (Exception e) {
        e.printStackTrace();
    }
}

public static void main(String[] args) {

    for (int msg = 0; msg < 20; msg++) {
        DataBean obj = getData();
        new Producer().sendResponse(xml, obj);
        ;
    }
}

挂起线程异常详细信息:

类型 1:

ActiveMQ Transport: tcp:///127.0.0.1:41818
java.net.SocketInputStream.socketRead0(Native Method)
java.net.SocketInputStream.read(SocketInputStream.java:152)
java.net.SocketInputStream.read(SocketInputStream.java:122)
org.apache.activemq.transport.tcp.TcpBufferedInputStream.fill(TcpBufferedInputStream.java:50)
org.apache.activemq.transport.tcp.TcpBufferedInputStream.read(TcpBufferedInputStream.java:58)
java.io.DataInputStream.readInt(DataInputStream.java:387)
org.apache.activemq.openwire.OpenWireFormat.unmarshal(OpenWireFormat.java:272)
org.apache.activemq.transport.tcp.TcpTransport.readCommand(TcpTransport.java:210)
org.apache.activemq.transport.tcp.TcpTransport.doRun(TcpTransport.java:202)
org.apache.activemq.transport.tcp.TcpTransport.run(TcpTransport.java:185)
java.lang.Thread.run(Thread.java:745)

类型 2:

ActiveMQ Transport: tcp://localhost/127.0.0.1:61602
java.net.SocketInputStream.socketRead0(Native Method)
java.net.SocketInputStream.read(SocketInputStream.java:152)
java.net.SocketInputStream.read(SocketInputStream.java:122)
org.apache.activemq.transport.tcp.TcpBufferedInputStream.fill(TcpBufferedInputStream.java:50)
org.apache.activemq.transport.tcp.TcpBufferedInputStream.read(TcpBufferedInputStream.java:58)
java.io.DataInputStream.readInt(DataInputStream.java:387)
org.apache.activemq.openwire.OpenWireFormat.unmarshal(OpenWireFormat.java:272)
org.apache.activemq.transport.tcp.TcpTransport.readCommand(TcpTransport.java:210)
org.apache.activemq.transport.tcp.TcpTransport.doRun(TcpTransport.java:202)
org.apache.activemq.transport.tcp.TcpTransport.run(TcpTransport.java:185)
java.lang.Thread.run(Thread.java:745)

请您就此问题提供一些提示以供进一步调查。

编辑:我在 Internet 上阅读了一些帖子并得出结论，我必须更新 activemq jar 文件并实现超时，但是当我开始阅读有关超时设置的内容时，我很困惑是否应该在生产者和消费者或故障转移或消息或代理服务中设置超时。考虑到上述代码和异常，每个组件的超时都有不同的目的，那么我应该在哪里实现超时。

Answer 1

创建连接的成本非常高，当您关闭它时，该端口最多保留 3 分钟，以确保它干净地关闭。

您只想在确实必须避免性能问题时才创建连接。我建议您创建连接一次，并保持该连接打开，除非出现错误。这可以将性能提高 2 到 3 个数量级。

这是一个很好的性能调优模式，适用于许多情况；

• 仅在确实需要时才创建和销毁昂贵的资源。
• 您多次执行的操作应保持在最低限度。即尽可能少地重复做。