[GitHub] [skywalking] liyanyan-dev opened a new issue #3482: What the sampling mechanism is

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liyanyan-dev opened a new issue #3482:  What the sampling mechanism is
URL: https://github.com/apache/skywalking/issues/3482
 
 
   Please answer these questions before submitting your issue.
   
   - Why do you submit this issue?
   - [ √] Question or discussion
   - [ ] Bug
   - [ ] Requirement
   - [ ] Feature or performance improvement
   
   ___
   ### Question
   - What do you want to know?
   I want to know what the sampling mechanism is? For example, I have 3 services and are distributed in different nodes. The calling relationship is A->B->C. When I configure the sampling to 300, if a call A is acquired, B and C will be collected. Is it still possible that in a call chain, A and C are collected, B is discarded, and the actual call chain becomes A->C?
   If this is the latter case, the configuration of the sample may cause the call chain displayed on the web interface to be missing or incorrect.
   
   我想了解一下采样的机制是什么？例如我有3个服务，并且分布在不同的节点，调用关系为A->B->C；当我配置采样为300时，如果某一次调用A被采集，B和C一定会被采集？还是有可能在一次调用链中，A和C被采集到，B被丢弃，实际调用链就成了A->C?如果是后一种这样的话，配置采样之后就有可能导致在web界面显示的调用链缺失或者不正确
   
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   ### Bug
   - Which version of SkyWalking, OS and JRE?
    skywalking v6.20
   - Which company or project?
   
   - 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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