What is the principle and mechanism of dubbo

Explanation of dubbo principles and mechanisms: 1. Core components; 2. Communication principles; 3. Cluster fault tolerance; 4. Automatic discovery and registration; 5. Load balancing and routing; 6. Serialization and transmission; 7 , monitoring and logging; 8. Scalability; 9. Security; 10. Integration with Spring; 11. Integration with other technologies. Detailed introduction: 1. Core components, including registration center, monitoring center, service consumer and service provider; 2. Communication principle, Dubbo uses the network communication framework to make service calls, and it provides a variety of long-term connections based on it.

The operating system for this tutorial: Windows 10 system, DELL G3 computer.

Dubbo is a high-performance distributed service framework, mainly used to improve service performance and transparent remote procedure calls (RPC). The following is a detailed explanation of Dubbo’s principles and mechanisms:

1. Core components:

• Registry: Service consumers and providers pass Registration center for registration and discovery. The registration center is responsible for storing service provider information and notifying consumers of changes in service providers.
• Monitoring Center (Monitor): The monitoring center is used to collect statistical information on service calls, such as the number of calls, calling time, etc., and sends it to the monitoring center in real time.
• Service Consumer (Consumer): The service consumer obtains the address list of service providers through the registration center, and then selects an appropriate service provider to call according to the load balancing policy.
• Service provider (Provider): The service provider exposes its service interface to consumers and publishes its services through the registration center.

2. Communication principle:

• Dubbo uses the network communication framework to make service calls. It provides abstract encapsulation of a variety of long-term connection-based NIO frameworks, including multiple thread model serialization and "request-response" mode information exchange methods. This communication method based on long connections can reduce the cost of each communication and improve the performance of service calls.

3. Cluster fault tolerance:

• Dubbo provides transparent remote procedure calls based on interface methods, including multi-protocol support and soft load balancing , failure tolerance, address routing, dynamic configuration and other cluster support. This fault-tolerant mechanism ensures that when a problem occurs with a service provider, consumers can automatically switch to other available providers, ensuring service availability.

4. Automatic discovery and registration:

• Dubbo is based on the registration center directory service, enabling service consumers to dynamically find server providers. Make addresses transparent so that service providers can smoothly add or remove machines. When service providers start, they register their information in the registry. Consumers will also subscribe to the services they need in the registration center when they start. When a service provider or consumer starts or stops, the registration center will push a notification to the consumer so that the consumer can obtain the latest status of the service in a timely manner.

5. Load balancing and routing:

• Dubbo supports a variety of load balancing strategies, such as random, polling, least active calls, etc. The consumer selects an appropriate service provider to call based on the load balancing policy. At the same time, Dubbo also supports method-based routing, which can be routed based on method names, parameter types, etc., to achieve more flexible service calls.

6. Serialization and transmission:

• Dubbo supports multiple serialization protocols, such as Hessian2, Kryo, Protobuf, etc. Serialization protocols are used to convert data into a format that can be transmitted over the network. Dubbo can choose the appropriate serialization protocol as needed to improve the efficiency and compatibility of data transmission.

7. Monitoring and logging:

• Dubbo provides a monitoring function that can collect service call statistics, such as the number of calls, call time, etc., and send it to the monitoring center. This can help developers and operation and maintenance personnel understand the performance and bottlenecks of the service and make corresponding optimizations. At the same time, Dubbo also provides a detailed log output function to facilitate debugging and troubleshooting.

8. Scalability:

• Dubbo has good scalability and allows developers to customize some functions, such as load balancing strategies and sequences. protocol, etc. This enables Dubbo to meet a variety of different business needs and scenarios.

9. Security:

• Dubbo supports OAuth2-based security authentication and authorization mechanism to ensure security and permissions during service invocation. control. At the same time, Dubbo also supports the use of SSL/TLS for encrypted communication to protect the security of data transmission.

10. Integration with Spring:

• Dubbo can be seamlessly integrated with the Spring framework, making service configuration and management more convenient and flexible. Through Spring configuration, you can easily enable Dubbo service and specify related parameters.

11. Integration with other technologies:

• Dubbo is not limited to the Java platform, but can also be integrated with other languages ​​and platforms. For example, Dubbo provides support for Python, C, etc., allowing services in different languages ​​to call and integrate with each other.

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