candyleer commented on issue #1196: Complex span info for AsyncHttpClient and 
exception 
URL: 
https://github.com/apache/incubator-skywalking/issues/1196#issuecomment-387708818
 
 
   @wu-sheng  the work flow of `Async http client` can be drawed as:
   
![image](https://user-images.githubusercontent.com/11530760/39812286-98832838-53be-11e8-9358-488f5299cc2d.png)
   
   there are 3 thread to work ,so it's hard to start the local span in main 
thread ,the data is transfer by queue but not `new Thread()` directly, so do 
you have any proposal for this to trace? I can trace `thread-3` ,but it's hard 
to trace `main` to `thread-3` especially it's based on queue.

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