From: "Iñaki Baz Castillo" <ibc@aliax.net>
To: mongrel-unicorn@rubyforge.org
Subject: Re: Confused classes
Date: Sat, 6 Feb 2010 14:06:04 +0100 [thread overview]
Message-ID: <201002061406.04172.ibc@aliax.net> (raw)
In-Reply-To: <de9b0f01002060433s3a8cdcf6j7476ef7e83d396ca@mail.gmail.com>
El Sábado, 6 de Febrero de 2010, Warren Konkel escribió:
> I switched from mod_passenger to unicorn on a fairly high traffic site
> and ran into a strange problem that forced me to move back to
> mod_passenger... it seems as if classes would sometimes get mixed up
> with each other. If I had two Rails models:
>
> class Foo < ActiveRecord::Base; end
> class Bar < ActiveRecord::Base; end
>
> Normally Foo.inspect and Bar.inspect would return:
>
> Foo(field1: integer, field2: integer)
> Bar(field3: integer, field4: integer)
>
> When things were "broken" within a process, sometimes I would see:
>
> Foo(field3: integer, field4: integer) <--- note field3/field4
> actually belong to Bar, not Foo
>
> And because of that, wacky errors would appear in my logs like:
>
> Foo.find_by_field1(12345) --> not a method
> Foo.create(:field1 => 12345) --> column not found
>
> I also noticed the problem with field serializing in ActiveRecord... given:
>
> class Boz < ActiveRecord::Base
> serialize :some_data
> end
>
> When processes were working correctly, Boz.find(1).some_data would
> return an actual object (like a Hash). When things were broken, the
> raw serialized string from the database would be returned... almost as
> if the Boz class "forgot" that it's supposed to deserialize
> "some_data".
>
> Could it be that class attributes are somehow being co-mingled when
> unicorn is starting up under high concurrency? Perhaps a mutex is
> missing somewhere?
IMHO all your Unicorn workers are sharing the same DB connection (the same
ActiveRecord instances) so the problem arises.
Take a look to the configuration here:
http://unicorn.bogomips.org/examples/unicorn.conf.rb
You can see there how the ActiveRecord is disconnected at the beggining and
started for each worker later.
--
Iñaki Baz Castillo <ibc@aliax.net>
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next prev parent reply other threads:[~2010-02-06 13:22 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-02-06 12:33 Confused classes Warren Konkel
2010-02-06 13:06 ` Iñaki Baz Castillo [this message]
2010-02-07 2:01 ` Eric Wong
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