Temporarily kick out the problem service instance
Dubbo provides the service management capability of temporarily removing problematic service instances, which can temporarily remove problematic service instances without restarting the application.
Dubbo can temporarily remove problem service instances through XML configuration, annotation configuration, and dynamic configuration. Here we mainly introduce the dynamic configuration method. For other configuration methods, please refer to the old document Configuration
before the start
Please make sure to run Dubbo-Admin successfully
When the service is running online, it is inevitable that some nodes have problems. In order not to affect the normal operation of the overall service, the service instance with the problem needs to be temporarily offline. Dubbo-Admin provides the ability to temporarily remove problematic service instances, which can help you temporarily offline problematic service instances without affecting the operation of the overall service.
- Log in to the Dubbo-Admin console
- In the left navigation pane, select Service Governance > Dynamic Configuration.
- Click the Create button, fill in the rule content in the create dynamic configuration panel, and click Save.
--- configVersion: v2.7 scope: application/service key: app-name/group+service+version enabled: true configs: - addresses: ["0.0.0.0"] providerAddresses: ["126.96.36.199:20880", "188.8.131.52:20881"] side: consumer applications/services:  parameters: timeout: 1000 loadbalance: random - addresses: ["0.0.0.0:20880"] side: provider applications/services:  parameters: threadpool: fixed threads: 200 iothreads: 4 dispatcher: all weight: 200 ...
For the scenario of temporarily kicking out problematic service instances, you only need to clarify the following issues to know how to write the configuration:
- Whether you want to modify the configuration of the entire application or a service.
scope: application, key: app-name(you can also use
servicesto specify certain services).
scope: service, key:group+service+version.
- The modification is applied to the provider side.
- Whether the configuration takes effect only for certain specific instances.
- All instances:
addresses: ["0.0.0.0:*"]depends on the side value.
- Specified instances:
addersses[list of instance addresses].
- All instances:
- The disabled parameter to be modified.
Select the application related to the temporary removal of the problematic service instance configuration to trigger the call verification.