Rocketmq Client 3.6.2.2.final framework high availability and fault tolerance mechanism (High AvailanceY and Fault Tolerance MeChanism of Rocketmq Client 3.6.2.final Framework))
RocketMQ Client 3.6.2.final framework high availability and fault tolerance mechanism
Overview:
RocketMQ is an open source distributed message middleware that is used to solve the problem of high concurrency transmission and processing problems.RocketMQ Client is a client library of RocketMQ, which provides applications with the ability to send and consumer messages.RocketMQ Client 3.6.2.final framework provides high availability and fault -tolerant mechanism to ensure the reliable transmission and processing of the message.
1. High availability mechanism:
1. Main architecture:
Rocketmq Client 3.6.2.final framework provides high availability by achieving the main architecture.When sending messages, the client sends the message to the master node, the master node stores the message in the disk, and replicates the message to the node asynchronously.If the main node fails, the node will take over the work of the master node and continue to process and store messages.This main framework ensures the redundancy of the message and the rapid switching and recovery capabilities of the system when the master node fails.
2. Fault detection and automatic switching:
Rocketmq Client 3.6.2.2.final framework sends a heartbeat to the server to detect the availability of the server.If the client fails to receive the heartbeat of the server, the judgment server will fail.In this case, the client will automatically switch to another available server to ensure the continuous transmission and processing of the message.
2. Mascher tolerance mechanism:
1. Review of the message:
Rocketmq Client 3.6.2.final framework provides a message retry mechanism to deal with messages caused by network failure and processing failure.When the sending message fails, the client will automatically send the message automatically until the maximum number of reviews or the sending is successful.
2. Power and other sexual guarantees:
Rocketmq Client 3.6.2.final framework realizes power such as the only messageid of the message.When the message sends fails and needs to be retrieved, the server can identify and filter the duplicated messages based on the message ID, ensuring the power processing of the message processing according to the message ID.
3. Affairs news:
RocketMQ Client 3.6.2.final framework also provides transaction message mechanisms.Affairs messages can ensure the reliability transmission and processing of the message, and can maintain the consistency of transaction even in the face of client or server failure.By implementing a specific transaction monitor interface and using transaction producers to send transaction messages, the transactional operation of messages can be achieved in the process of sending and consumption.
Example code:
The following is an example of Java code that uses RocketMQ Client 3.6.2.2.final framework:
import org.apache.rocketmq.client.producer.DefaultMQProducer;
import org.apache.rocketmq.client.producer.SendCallback;
import org.apache.rocketmq.client.producer.SendResult;
import org.apache.rocketmq.client.producer.SendStatus;
import org.apache.rocketmq.common.message.Message;
import org.apache.rocketmq.remoting.exception.RemotingException;
public class RocketMQProducer {
public static void main(String[] args) {
DefaultMQProducer producer = new DefaultMQProducer("producerGroup");
producer.setNamesrvAddr("localhost:9876");
try {
producer.start();
Message message = new Message("myTopic", "myTag", "Hello RocketMQ".getBytes());
producer.send(message, new SendCallback() {
@Override
public void onSuccess(SendResult sendResult) {
if (sendResult.getSendStatus() == SendStatus.SEND_OK) {
System.out.println("Message sent successfully.");
}
}
@Override
public void onException(Throwable e) {
System.out.println("Failed to send message: " + e.getMessage());
}
});
} catch (Exception e) {
e.printStackTrace();
} finally {
producer.shutdown();
}
}
}
This is a simple RocketMQ producer example. By creating the DEFAULTMQPRODUCER object, and setting the name server address, we can use the Producer.send () method to send messages.When sending messages, you can use SendCallback to handle success and send abnormalities.
Summarize:
RocketMQ Client 3.6.2.final framework provides high availability and fault -tolerant mechanisms to ensure the reliable transmission and processing of the message.The main architecture and fault detection and automatic switching mechanism provides high availability, and the fault tolerance is provided with the sexual guarantee and transaction message mechanism of message retry, power, and transaction message mechanisms.By using RocketMQ Client, developers can easily build a reliable message transmission system.
