[GitHub] jinlongwang opened a new issue #1549: Shadow tracing context. Thread dump error when pressure test

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jinlongwang opened a new issue #1549: Shadow tracing context. Thread dump error when pressure test
URL: https://github.com/apache/incubator-skywalking/issues/1549
 
 
   Please answer these questions before submitting your issue.
   
   - Why do you submit this issue?
   - [ ] Question or discussion
   - [x] Bug
   - [ ] Requirement
   - [ ] Feature or performance improvement
   
   ___
   ### Question
   - What do you want to know?
   My application provide a http interface and it will query redis. i added skywalking agent to my application. When qps under 2000 everything is fine but when the qps over 2000 i get some exceptions 
   ```
   WARN 2018-08-15 19:04:36 TracingContext :  More than 300 spans required to create 
   java.lang.RuntimeException: Shadow tracing context. Thread dump
   	at org.apache.skywalking.apm.agent.core.context.TracingContext.isLimitMechanismWorking(TracingContext.java:515)
   	at org.apache.skywalking.apm.agent.core.context.TracingContext.access$100(TracingContext.java:56)
   	at org.apache.skywalking.apm.agent.core.context.TracingContext$7.doProcess(TracingContext.java:334)
   	at org.apache.skywalking.apm.agent.core.dictionary.PossibleFound.doInCondition(PossibleFound.java:50)
   	at org.apache.skywalking.apm.agent.core.context.TracingContext.createExitSpan(TracingContext.java:330)
   	at org.apache.skywalking.apm.agent.core.context.ContextManager.createExitSpan(ContextManager.java:125)
   	at org.apache.skywalking.apm.plugin.jedis.v2.JedisMethodInterceptor.beforeMethod(JedisMethodInterceptor.java:37)
   	at org.apache.skywalking.apm.agent.core.plugin.interceptor.enhance.InstMethodsInter.intercept(InstMethodsInter.java:82)
   	at redis.clients.jedis.Jedis.get(Jedis.java)
   ```
   obviously， this http interface can not have to many spans. so what's wrong with it?
   
   ___
   ### Bug
   - Which version of SkyWalking, OS and JRE?
     SkyWalking: `5.0.0-beta2`
     OS: `CentOS release 6.6 (Final)`
    JRE: `jdk1.7.0_80`
   
   - Which company or project?
     autohome Inc
   
   - What happen?
   If possible, provide a way for reproducing the error. e.g. demo application, component version.
   
   ___
   ### Requirement or improvement
   - Please describe about your requirements or improvement suggestions.

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