Answer inline.
Liu,Jiapeng <[email protected]> 于2020年1月2日周四 下午4:06写道： > Hi All: > Dear skywalking submitter,I am from Baidu Aifanfan,.We are currently > selecting the tracing system.There are currently 2 alternatives > 1. Skywalking > 2. Baidu Internal System in feng chao > Since the calculation of skywalking relies only on OAP clusters, reducing > the cost of deployment and operation and maintenance, currently it is more > inclined to choose skywalking > As the current system sla calculation is relatively special, the specific > logic is as follows: > One call across 3 systems.The call is c-> b-> a. If B is exception, A is > normal, C will also be recorded as an exception > In SkyWalking, it depends on the interface response of C, if C propagates the error because of b's response code, then yes, it will be recorded as one failure. > > I want to ask All, service, entrypoint dimensions, what is the logic of > sla? At present our department will want to It is used in the test > environment on k8s, but there is a problem in the calculation logic of sla, > because the relevant information is relatively small and cannot be > determined at present, > SLA today in SkyWalking is quite simple, SLA == successful rate, due to the OAL script. > service_sla = from(Service.*).percent(status == true); You could override this logic by providing your own function at OAL level. > The currently understood skywalking process: > 1. java agent dot, generate span > 2. Instance-level spans are aggregated into segments and issued > 3. OAP parsing segments and local files > 4. Stream processing > > > Points in doubt (none found in the code): > 1.The segment index in the es data has an isError field. Is this part of > the isError an OR relationship? If there is an error in a segment in a > segment, the overall segment is judged for error > If there is at least one span in the segment tagged as an error, then this segment will be `isError=true`. > 2.How does the isError of the spans in the segment converge to statuses > such as ALL, SERVICE, etc. > That depends on the OAL script. Such as for service > service_sla = from(Service.*).percent(status == true); You could find all in the official_analysis.oal in source code or release tar > 3. If the access party's RBI interface throws a service exception, is > there an ignored interface in skywalking? > What is RBI interface? Today, all error is related to error status of span in the tracing scenario, https://github.com/apache/skywalking/blob/4e501328171f434c74144d373be6df0264f43a24/oap-server/server-receiver-plugin/skywalking-trace-receiver-plugin/src/main/java/org/apache/skywalking/oap/server/receiver/trace/provider/parser/listener/endpoint/MultiScopesSpanListener.java#L224. How is span in error status, it depends on the plugin. Mostly, if an exception or 400+ HTTP response code detected. Sheng Wu 吴晟 Twitter, wusheng1108 > > I hope to get help from you, thankyou > > > > Evan.liu > > > > > Evan.liu > >
