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Resilience4j Plugin

Description#

  • Resilience4j is one of the options that supports flow control and circuit breaking.
  • Resilience4j supports flow control and circuit breaking functions for gateway.

Plugin Setting#

Select a mode to start shenyu-admin. For details, see deployment. For example, with Local Deployment starts the Apache ShenYu background management system.

  • In BasicConfig --> Plugin --> resilience4j, set to enable.
  • If the user don't use, please disable the plugin in the background.

Add resilience4j plugin dependency#

  • Add resilience4j dependency in the pom.xml file of the gateway.
        <!-- apache shenyu resilience4j plugin start-->        <dependency>            <groupId>org.apache.shenyu</groupId>            <artifactId>shenyu-spring-boot-starter-plugin-resilience4j</artifactId>            <version>${project.version}</version>        </dependency>        <!-- apache shenyu resilience4j plugin end-->

Resilience4j Config#

For more information on selectors and rules configuration, see Selector And Rule Config , only some of the fields are covered here.

Selector Config#

It is used to filter traffic for the first time and does not require handle fields.

Rule Config#

For the final filtering of traffic, there is a rule handler logic.

  • Resilience4j Processing Details

    • limitForPeriod ：Configures the number of permissions available during one limit refresh period,default value:50.

    • limitRefreshPeriod ：Configures the period of a limit refresh. After each period the rate limiter sets its permissions count back to the limitForPeriod value,default value:500.

    • timeoutDurationRate ：Configures wait time(ms) a thread waits for a permission,default value:5000.

    • circuitEnable ：Configures circuitBreaker enable, 0:OFF ,1:ON ,default value:0.

    • failureRateThreshold ：Configures the failure rate threshold in percentage,When the failure rate is equal or greater than the threshold the CircuitBreaker transitions to open and starts short-circuiting calls,default value:50.

    • fallbackUri ：Configures the fallback uri.

    • minimumNumberOfCalls ：Configures the minimum number of calls which are required (per sliding window period) before the CircuitBreaker can calculate the error rate or slow call rate,default value:100.

    • bufferSizeInHalfOpen：Configures the number of permitted calls when the CircuitBreaker is half open,default value:10.

    • slidingWindowSize ：Configures the size of the sliding window which is used to record the outcome of calls when the CircuitBreaker is closed,default value:100.

    • slidingWindowType ：Configures the type of the sliding window which is used to record the outcome of calls when the CircuitBreaker is closed, Sliding window can either be 0:count-based or 1:time-based.,default value:0.

    • timeoutDuration ：Configures request CircuitBreaker timeout(ms),default value:30000.

    • waitIntervalInOpen ：Configures the circuitBreaker time(ms) of duration,default value:10.

    • automaticTransitionFromOpenToHalfOpenEnabled ：Configures automatically transition from open state to half open state,true:ON, false:OFF, default value:false.