jthomas commented on issue #373: Improve message when activation is queried 
before action is run
URL: 
https://github.com/apache/incubator-openwhisk/issues/373#issuecomment-346653888
 
 
   I've also run into issues due to this design. There's a couple of use-cases 
where I'd like to be able to retrieve an activation record before it has 
finished....
   
   - Monitoring activation from non-blocking invoke. Currently you'd have to 
poll the record waiting for the 404 to disappear but it's a bit error prone in 
case the activation id was wrong. 
   
   - Checking for in-flight activations. I have an action connected to a timer 
that varies in execution duration. If the action takes too long to execute, the 
next trigger will fire before it has finished. If I could check for in-flight 
activations, the next action could exit instead of running. 

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