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?
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