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Callbacks on large number of EmbeddedDocuments blows stack
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Jamie Orchard-Hays  
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 More options Apr 16 2012, 9:57 am
From: Jamie Orchard-Hays <jamie...@gmail.com>
Date: Mon, 16 Apr 2012 09:57:55 -0400
Local: Mon, Apr 16 2012 9:57 am
Subject: Callbacks on large number of EmbeddedDocuments blows stack
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I wonder if anyone else has encountered this. I've written a detailed description in a bug ticket at github.

https://github.com/jnunemaker/mongomapper/issues/405

(Not a problem on Rails 2.3.x and MM 0.8.6.)

I'm hoping to have time to dig into the MM code to see if I can offer up a fix soon.

Jamie


 
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Brandon Keepers  
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 More options Apr 16 2012, 10:06 am
From: Brandon Keepers <bran...@opensoul.org>
Date: Mon, 16 Apr 2012 10:06:50 -0400
Local: Mon, Apr 16 2012 10:06 am
Subject: Re: [MongoMapper] Callbacks on large number of EmbeddedDocuments blows stack
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Jamie,

That is the same issue as https://github.com/jnunemaker/mongomapper/issues/265. A lot of people have experienced the issue, but nobody has submitted a fix for it.

I've never run into it because I don't use embedded docs in that manner. If I ever sense that an embedded association could end up with more than two or three documents, I pull it out into a collection. I've never had an instance where I would need every associated doc whenever I fetched the parent. I'm not saying there's not a legitimate use case for needing ~80 embedded docs every time the parent is fetched, but I do think it's rare and most people would be better off using a non-embedded document.

Unless someone can figure out a way to hack ActiveSupport 3's Callbacks, then I agree with @jnunemaker, I think we should just pull callbacks on embedded documents.

=b


 
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Jamie Orchard-Hays  
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 More options Apr 16 2012, 10:22 am
From: Jamie Orchard-Hays <jamie...@gmail.com>
Date: Mon, 16 Apr 2012 10:22:28 -0400
Local: Mon, Apr 16 2012 10:22 am
Subject: Re: [MongoMapper] Callbacks on large number of EmbeddedDocuments blows stack
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Thanks, Brandon. My use case is I'm storing monthly reports. It makes a lot of sense to me to store my data this way. I'd love to hear arguments against it. My experience that past two years working extensively is that there is a sweet spot I have to find for certain situations between write and read performance when I have large trees like for these reports.

I'll take bug-specific comments to the ticket.

Cheers,

Jamie

On Apr 16, 2012, at 10:06 AM, Brandon Keepers wrote:


 
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