- 如果 @FeignClient 标注的接口扩展了其他接口，则设置 fallback 后，Spring 会提示被扩展的接口有两个实现 Bean，改为设置 fallbackFactory 可以解决此问题。需要注意的是，FallbackFactory的实现类必须为 Spring 中的组件。
import java.util.List;
import com.yonyou.ocm.common.rules.RuleDto;
import feign.hystrix.FallbackFactory;
import lombok.extern.slf4j.Slf4j;
import org.springframework.stereotype.Component;
@Slf4j
@Component
public class RuleClientFallbackFactory implements FallbackFactory<RuleClient> {
@Override
public RuleClient create(Throwable throwable) {
return new RuleClient() {
@Override
public List<RuleDto> getEnabledCommonRules() {
log.info("Fallback for RuleClient.getEnabledCommonRules");
return null;
}
@Override
public List<RuleDto> getEnabledRulesByPackage(String packageName) {
log.info("Fallback for RuleClient.getEnabledRulesByPackage");
return null;
}
};
}
}
- 超时时间配置：Hystrix 的超时时间应当大于 Ribbon 的超时时间。否则在控制台会出现一条警告信息。
- Hystrix
hystrix:
command:
default:
execution:
isolation:
thread:
# 应该大于(ribbonReadTimeout + ribbonConnectTimeout) * (maxAutoRetries + 1) * (maxAutoRetriesNextServer + 1)
timeoutInMilliseconds: 21000
- Ribbon
ribbon:
ReadTimeout: 5000
ConnectTimeout: 5000
