"Cannot invoke an uninitialized action." error occurs intermittently about openwhisk-runtime-dotnet HOT 5 CLOSED

@sechunOH Thank you for the contribution.
I believe @shawnallen85 can review it.
Please open a pr :)

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@sechunOH Can you provide the stress test you had performed and I can review the code and duplicate the issue and validate the resolution? Thanks!!

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@shawnallen85
I found history and the error occurred not only on stress test.
I created cron trigger(using alarm package) consisting of two or more same actions with option "*/1 * * * *"
Then I was waiting a few hours or a day until "running result: not ok" appears. (in invoker log)

< Action info >

Action is a dotnet sample action.

action download: https://github.com/sechunOH/sample-actions/blob/master/helloDotNet.zip
main: Apache.OpenWhisk.Example.Dotnet::Apache.OpenWhisk.Example.Dotnet.Hello::Main


< Test environment spec >

4core 4G mem VM 2EA : 2-controller deployed per vm
4core 4G mem VM 3EA : 1-invoker deployed per vm

Controller heap : 2G
Invoker heap : 2G, user-memory : 2048

no prewarmed container provided for dotnet action

First, if you duplicate this issue, I will open a pr.
if you need more informations, please reply. thanks!

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Alrighty -- I finally got to reviewing this. The only change I believe that needs to happen is in Startup.cs for both 2.2 and 3.0.

We need to check if run is null before returning the ok.
~ line 43
if (httpContext.Request.Path.Equals(initPath))
{
run = await init.HandleRequest(httpContext);
if(run != null)
await httpContext.Response.WriteResponse(200, "OK");
return;
}

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@shawnallen85
Ok. I added that codes and opened a pr. (#29)
could you please review it?

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