Shiny app works locally, fails on deploy with useless error messages

[tommy...@unbounce.com]

I have an app that works perfectly locally but when I deploy just says:

An error has occurred

The application failed to start.

and there are no logs available, so I can't debug. I've taken out nearly everything and it still fails. Not sure how to proceed here, any suggestions?

[Tareef Kawaf]

Can you include a link to your application please?  I am presuming that you see no logs when you run: rsconnect::showLogs()

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[Andy Kipp]

This is probably related to startup timeout. If you're loading lots of data outside shinyServer() function or in your global.R, you can get this error if that operation takes longer then 60 seconds. You can adjust the startup timeout in the advance settings page for your application in the shinyapps.io dashboard.

-Andy

On Thu, Apr 7, 2016 at 2:56 PM, Tommy Levi <tommy...@unbounce.com> wrote:

That is correct...

The link is:

https://tslevi.shinyapps.io/topicVis/

when I run that command I get:

 rsconnect::showLogs()

Error in rsconnect::showLogs() : 

  No application found. Specify the application's directory, name, and/or associated account.

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Thomas Levi

Director of Data Science

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[Tommy Levi]

Unfortunately that did not solve the problem (I increased the load time to 300s). I'd also note that locally it loads quite fast.

[Andy Kipp]

The other possibility is that you're exceeding memory limits (by default this is 1GB), which is casing your application to crash while its loading. If you're in the basic plan or above, you can increase the memory limit for your application by changing the instance size in the settings page for your application.

[Tommy Levi]

I'm not, but how can I tell if that's the case?

[Tommy Levi]

Looking at the performance charts on the web, the memory never goes above 150mb which is well below the 1gb limit I have set.

[Andy Kipp]

Tommy,

I double checked our internal logs and I can confirm your application is being killed for exceeding memory usage. It's not being reflected in the graphs probably because its happening so quickly after startup. 

-Andy

[Tommy Levi]

Awesome, that tells me how to debug it! Now I can go down the memory optimization rabbit hole as opposed to wondering at every line if double vs single quotes or some weird encoding error between OSX and Linux could be the issue.

Thanks a ton guys!

[tommy...@unbounce.com]

Awesome, that tells me how to debug it! Now I can go down the memory optimization rabbit hole as opposed to wondering at every line if double vs single quotes or some weird encoding error between OSX and Linux could be the issue.

Thanks a ton guys!

I guess this begats a feature suggestion whereby if that is the reason an application doesn't load the error message communicate that? It's very hard to tell (especially if you're already at the max size allowed in your tier) if that's the issue from the current reporting/logs.

[tommy...@unbounce.com]

I think there's something more going on here. I did these steps:

1. Took everything out of the original app except the slider and it still failed to load when deployed.

2. Copied that over to another directory and app, re-deployed and it ran fine.

3. Added all the original code back in (uncommenting basically) deployed and it ran fine.

4. Original project still failing with same error message.

5. Delete original project in shinyapps, redeploy and it works fine.

I don't really see how identical code, identical data (in rds files) can lead to completely different results so something must have been wrong with the project on the shinyapps.io end.

[Tareef Kawaf]

If you can send me your application code.  I can try and see if I have the same issues locally and then on shinyapps.io.