Comments on: Ruby Background Tasks with Starling

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By: Nancy Snyder

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By: Dave

Dave — Tue, 14 Dec 2010 00:59:52 +0000

I’m not sure what you are trying to accomplish by doing this? If you set RAILS_ENV=test, no queue will be used and your workers will be called synchronously. This will allow for testing to happen normally. You can also set your environments to use Asynch calls as well. However, if you do that, then your tests will only ensure that a message will be put on the queue. There will be no no way to know if anything happened as a result of the message.

By: Lee

Lee — Mon, 13 Dec 2010 20:59:32 +0000

Hi Dave,

I know this is a very late comment, but I’ll shoot anyway.

What if you want to run some tests that incorporate workling on the same box you develop on? Or what if your development box is the same as your production box (for perhaps a different branch of your code)?

It seems workling only respects RAILS_ENV and there is no way I can see to get this to play nicely.

I can do something like manually set RAILS_ENV=test in my tests, then set it back to RAILS_ENV=development afterwards, but that seems really hacky and far less than ideal.

any suggestions would be appreciated.

thanks,

Lee.

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By: Pierre

Pierre — Sun, 19 Sep 2010 19:58:38 +0000

Thanks a lot Dave – you pointed me in the right direction. My problem had nothing to do with Passenger. It took me a while to figure this out, but I think it was just a consequence of the load (I was testing with multiple simultaneous calls to my app). Indeed, I didn’t realize that the default timeout for memcache was 0.5s. Since I am making quite a lot of calls to the queue, some could not get completed in time and I was missing the respective message. When I set a long memcache timeout, the problem disappears.

I have to say it is kind of weird, since I have to set it really long (more than 10s, or even leaving it to nil). Something is blocking somewhere, I need to investigate.

Anyway, thank you very much for your help on this.

By: Dave

Dave — Fri, 17 Sep 2010 17:49:24 +0000

I can’t seem to find anything specific in my code. I processed several million messages with starling, workling, and passenger without a problem. The only thing I can think of is to make sure the :multithread arg is true when you init memcache-client. The issue here seems to be with starling which means that passenger may not have anyhing to do with it. Your workers are running in the workling processes, not passenger.

Are you getting the errors from your workers making the calls to each other vs. passenger app trying to add a new workling message to the queue?

By: Pierre

Pierre — Tue, 14 Sep 2010 20:25:05 +0000

Thanks a lot Dave. If you find out and could share some hints on how you managed to overcome this problem it would be fantastic – I am definitely struggling with this, and there is not that much info around…

I came across this fairly recent post:
http://plasti.cx/2010/02/03/getting-passenger-to-play-nice-with-interlock-cache_fu-and-memcached
where they say memcache-client just doesn’t work with Passenger and I was getting really concerned…

By: Dave

Dave — Tue, 14 Sep 2010 02:46:33 +0000

Pierre, I recall seeing something like this, but I can’t remember the details. Unfortunately, my computer is not available until Thursday. I will take a look then.