tokers commented on issue #2739:
URL: https://github.com/apache/apisix/issues/2739#issuecomment-731577350


   > @gewei2000 do you have fixed this issue? find out the reason?
   > 
   > what is it?
   
   The active health check target is added lazily when the upstream was first 
referenced, at that point, no health check information, so unhealthy endpoints 
might be used, especially when their weight are high or because the directional 
selection like consistent hash.
   
   Or after the health checker resume these offline endpoints from unhealthy to 
healthy,  they are offline again,  before the health checker spawns probe 
requests and achieve the threshold, these offline (or unstable) endpoints could 
be selected.


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