p-jonghyun opened a new issue, #5416:
URL: https://github.com/apache/openwhisk/issues/5416

   
https://github.com/apache/openwhisk/blob/ba871e59f7b77f02689a13e4e24e438645d67a47/tests/src/test/scala/ha/ShootComponentsTests.scala#L142-L145
   
   'use controller1 if controller0 goes down' test in  
ShootComponentsTests.scala does following procedures.
   
   1. restart controller0 container 
   2. /ping controller0 until it’s down 
   3. /ping controller1 to check it’s still up 
   4. ( Invoke Action(POST) + Get Action(GET) ) * 96 to nginx
   
   Isn't there a case when nginx will forward the first POST request to 
controller0, dispatching a request when the container is up, but the backend in 
the container not.
   
   Such behaivor will result in connection reset by peer which is not in 
Swagger Spec, failing the test.
   
   


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