[Spring Cloud Gateway] More than 500 spans required to create

[weixing-qiao]

System Info:
Gateway version: 2.1.5
skywalking agent version: 8.11.0
skywalking oap version: 9.1.0
skywalking satellite version: 1.0.0
Gateway agent Plugins: apm-spring-cloud-gateway-2.1.x-plugin-8.11.0.jar and spring-webflux-5.x-webclient-plugin-8.11.0.jar

1. When I set SW_AGENT_SPAN_LIMIT = 500, we got ERROR,

java.lang.RuntimeException: Shadow tracing context. Thread dump at org.apache.skywalking.apm.agent.core.context.TracingContext.isLimitMechanismWorking(TracingContext.java:558) at org.apache.skywalking.apm.agent.core.context.TracingContext.createEntrySpan(TracingContext.java:270) at org.apache.skywalking.apm.agent.core.context.ContextManager.createEntrySpan(ContextManager.java:116) at org.apache.skywalking.apm.plugin.spring.webflux.v5.DispatcherHandlerHandleMethodInterceptor.beforeMethod(DispatcherHandlerHandleMethodInterceptor.java:65) at org.apache.skywalking.apm.agent.core.plugin.interceptor.enhance.InstMethodsInter.intercept(InstMethodsInter.java:76) at org.springframework.web.reactive.DispatcherHandler.handle(DispatcherHandler.java) at org.springframework.web.server.handler.DefaultWebFilterChain.lambda$filter$0(DefaultWebFilterChain.java:122) at reactor.core.publisher.MonoDefer.subscribe(MonoDefer.java:44) at reactor.core.publisher.MonoDefer.subscribe(MonoDefer.java:52) at reactor.core.publisher.MonoFlatMap$FlatMapMain.onNext(MonoFlatMap.java:150) at reactor.core.publisher.Operators$MonoSubscriber.complete(Operators.java:1643) at reactor.core.publisher.MonoZip$ZipCoordinator.signal(MonoZip.java:247) at reactor.core.publisher.MonoZip$ZipInner.onNext(MonoZip.java:329) at reactor.core.publisher.Operators$ScalarSubscription.request(Operators.java:2205) at reactor.core.publisher.MonoZip$ZipInner.onSubscribe(MonoZip.java:318) at reactor.core.publisher.MonoJust.subscribe(MonoJust.java:54)

2. I was try to set SW_AGENT_SPAN_LIMIT = 30000, Gateway tracing normal will keep about serval mins on UI. After I not found any error log on oap and agent.

Questions:

1. if just enable two plugins(apm-spring-cloud-gateway-2.1.x-plugin-8.11.0.jar and spring-webflux-5.x-webclient-plugin-8.11.0.jar). is ok for skywalking ?
2. is there any idea for gateway can't display tracing on UI after serval mins ?
   

[weixing-qiao]

https://github.com/apache/skywalking-java/blob/main/test/plugin/scenarios/gateway-2.1.x-scenario/support-version.lis

Could Gateway version must full match with the support list version?

[wu-sheng]

https://github.com/apache/skywalking-java/tree/main/test/plugin/scenarios/gateway-2.1.x-scenario

This is how we test, and which versions are tested.

We have declared clearly, plugins are contributed by global community. We provide tests to verify as much as possible. If it doesn't work in your case, you have to check on your own. The maintainers can't know all plugins.

[weixing-qiao]

got it, Is there any suggestion what are plugins is must have for gateway? And is there any idea for gateway can't display tracing on UI after serval mins ?