Dynamically Adjust Service Timeout

Dubbo provides the ability to dynamically adjust service timeout, allowing adjustments without restarting the application, which is very effective for temporarily resolving issues of invocation failure due to unstable upstream and downstream service dependencies.

Before You Start

• Deploy the Shop mall project
• Deploy and open Dubbo Admin

Task Details

The mall project provides user information management services through org.apache.dubbo.samples.UserService. Access http://localhost:8080/, enter any username and password, and click Login to log into the system.

In some scenarios, the speed of the User service may slow down, such as when the database storing user data is overloaded, resulting in slow queries, which can cause UserService access timeouts and login failures.

In the demo system, you can simulate a sudden UserService access timeout exception through the Timeout Login in the image below.

Dynamically Adjust Timeout Through Rules

To address sudden login timeout issues, we can simply increase the waiting time for UserService service calls.

Steps

1. Open the Dubbo Admin console.
2. In the left navigation bar, select 【Service Governance】 > 【Dynamic Configuration】.
3. Click “Create”, enter the service org.apache.dubbo.samples.UserService, and the new timeout such as 2000.

After saving, click Timeout Login again, and after a brief wait, the system can log in normally.

Rule Details

Rule key: org.apache.dubbo.samples.UserService

Rule body

configVersion: v3.0
enabled: true
configs:
  - side: provider
    parameters:
      timeout: 2000

From the perspective of the UserService provider, the overall timeout is adjusted to 2s.

parameters:
  timeout: 2000

The side: provider configuration will send the rule to the service provider instance, and all UserService instances will re-publish based on the new timeout value, notifying all consumers via the registry.

Cleanup

To avoid affecting other tasks, delete or disable the timeout rule just configured through Admin.