带有paho的java.io.EOFException

Question

我想对mosquitto进行压力测试,所以我创建了一些代码,如下所示

for (int i = 0; i < 800; i++) {
        final int j = i;
        Thread t = new Thread(new Runnable() {
            @Override
            public void run() {
                System.out.println(j + " : ************");
                try {
                    MqttClient client = new MqttClient("tcp://192.168.88.203", SERVER_CLIENTID_PREFIX + j); 
                    client.connect();

                    MqttMessage message = new MqttMessage((j + ":me").getBytes());
                    message.setQos(2);

                    client.publish(TOPIC_PREFIX + j, message);
                } catch (MqttSecurityException e) {
                    e.printStackTrace();
                } catch (MqttException e) {
                    e.printStackTrace();
                }
            }
        });
        t.start();
    }

但是,我遇到了一些错误,比如EOFException在运行期间,一些客户端断开连接.我想知道有多少客户可以使用一台mosquitto服务器同时发布消息,我怎样才能进行压力测试.谢谢!

详细例外是:

    Connection lost (32109) - java.io.EOFException
    at org.eclipse.paho.client.mqttv3.internal.CommsReceiver.run(CommsReceiver.java:162)
    at java.lang.Thread.run(Thread.java:662)
Caused by: java.io.EOFException
    at java.io.DataInputStream.readByte(DataInputStream.java:250)
    at org.eclipse.paho.client.mqttv3.internal.wire.MqttInputStream.readMqttWireMessage(MqttInputStream.java:51)
    at org.eclipse.paho.client.mqttv3.internal.CommsReceiver.run(CommsReceiver.java:121)
    ... 1 more

我从mosquitto服务器发现了一些日志:

1383736170: Socket read error on client Server-82, disconnecting.

请帮帮我,谢谢!

Answer 1

我使用类似于上面的代码得到了完全相同的错误.我发现将QOS更改为0可以解决问题.

message.setQos(0);

[编辑]多一点挖,我发现MQTT插件RabbitMQ的不支持的2. QOS http://www.rabbitmq.com/mqtt.html

Answer 2

Linux 中有 1024 个文件/套接字限制，但您可以打破它，ulimit -n 4096请参阅： mqtt mosquitto linux 连接限制