Rails - May 2008 - A copy of XX has been removed from the module tree but is still active!

I have a class in my /lib/ directory called tracker.rb

It''s function is to receive an array of URLs and then perform 4
separate tasks on each URL

Each of the 4 tasks gets it''s own thread.

the class is called from my controller like:

output = Tracker.go([array_of_urls])

Sometimes, when it hits an exception, instead of just dieing
gracefully, my logs repeatedly display:

A copy of Tracker has been removed from the module tree but is still
active!

After this happens, I have to reboot my development server before it
will respond again.


Any ideas how or why this is happening?

Many thanks in advance for your insight.
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Some more information:

Usually, when I get this "A copy of Tracker has been removed from the
module tree but is still active!" error, the exception raised is:

wrong status line: "A\353\307\351\245}\243Z\213\364\232\3117\203w?
\axcnv\313\356\230v\350\345\f\346\032e\262\2148\002$hZ\3163\362''\373N+e
\3306\005''\3555\241\016\340\364\351\022+\333\340F\b
\372\274\244\357\004\212\241\026\325)6v\0056\t\374\017\023N%
\352\214\207\267R_,\017e^\3321\327Gq\031!
gG5\020\241\3565\356\200\3053\233\e\237\201\313\367\351/\327\206u.S
\331z.\023\326''\2277\303\v\361\366a\270\304yf\376\315h
\257\345A{\226\264\2352?\365\335\001_Hl:F\2429\322\250\320k\250\002k
\315\332\200\226\027P\374\335\363&\344\201#t<\355\360.\331\365?(X=:5Y
\240w6\365x\310\367\346\3368\315\350>W\370\034\377\351Uk\001iOW.=\300k
\036\351\307\323\303N\315\243\240\326eu\375AP,
\326\243\036\263\306\250\313\335\254hm/H\254L\251\212\334\022\363\366\251W\251UK\227W\373\215E\346\223\3316\343\375
\a
\336\347\224\355\224u\017\tq\006\364\v\334\346O\355\205s
\317\031\202\260\322''v?\2303\022\210\0062\002\300j\212mo^\254R\334=?
\275\331cu''\320G\216\021\353Sb\223\234\037\262\200s\367\a"
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On 15 May 2008, at 00:44, histrionics wrote:
>
> I have a class in my /lib/ directory called tracker.rb
>
> It''s function is to receive an array of URLs and then perform 4
> separate tasks on each URL
>
> Each of the 4 tasks gets it''s own thread.
>
> the class is called from my controller like:
>
> output = Tracker.go([array_of_urls])
>
> Sometimes, when it hits an exception, instead of just dieing
> gracefully, my logs repeatedly display:
>
I bet if you switched to production mode it would work. What I think  
is happening is:

- request calls Tracker.go
- Rails unloads loaded classes (since we''re in dev mode)
- You threads continue to run trying to use classes that rails has  
unloaded. Chaos ensues.

Fred
> A copy of Tracker has been removed from the module tree but is still
> active!
>
> After this happens, I have to reboot my development server before it
> will respond again.
>
>
> Any ideas how or why this is happening?
>
> Many thanks in advance for your insight.
> >

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Frederick Cheung wrote:
> I bet if you switched to production mode it would work. What I think
> is happening is:
> 
> - request calls Tracker.go
> - Rails unloads loaded classes (since we''re in dev mode)
> - You threads continue to run trying to use classes that rails has
> unloaded. Chaos ensues.
> 
> Fred
Bingo! Putting my application in production mode allowed me to make 
continual requests. It, however, doesn''t solve the problem though.

Problem:
I''ve got a module (AccessControl) in RAILS_ROOT/lib that extends my 
controllers (which inherit from ResourceController) and adds 
functionality to AuthenticatedSystem.  In development mode, this works 
fine via requests through the browser. However, once I try to consume 
the resources with ActiveResource, the first request succeeds and the 
next request fails with the following error:

ArgumentError (A copy of AccessControl has been removed from the module 
tree but is still active!):
   
/opt/local/lib/ruby/gems/1.8/gems/activesupport-2.1.1/lib/active_support/dependencies.rb:250:in
`load_missing_constant''
   
/opt/local/lib/ruby/gems/1.8/gems/activesupport-2.1.1/lib/active_support/dependencies.rb:468:in
`const_missing''
    /lib/access_control.rb:122:in `controller_target''
...

I can''t figure out why this would work via the browser but not through 
ActiveResource. The only thing that''s different, if I understand it 
correctly, are the headers:
    Accept: application/xml
    Content-Type: application/xml

Why would that make a difference? Not only that, the error is 
originating in the class it says it can''t find. Does anyone understand 
why this might be the case?
-- 
Posted via http://www.ruby-forum.com/.

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On Oct 1, 8:56 pm, Shawn Pyle
<rails-mailing-l...-ARtvInVfO7ksV2N9l4h3zg@public.gmane.org>
wrote:
> Frederick Cheung wrote:
> > I bet if you switched to production mode it would work. What I think
> > is happening is:
>
> > - request calls Tracker.go
> > - Rails unloads loaded classes (since we''re in dev mode)
> > - You threads continue to run trying to use classes that rails has
> > unloaded. Chaos ensues.
>
> > Fred
>
> Bingo! Putting my application in production mode allowed me to make
> continual requests. It, however, doesn''t solve the problem though.
>
The depedencies system has been confused: something is referencing an
old copy of the module but that old copy should not be used anymore
(since rails has reloaded a fresh copy). This can be caused by using
require inappropriately (http://spacevatican.org/2008/9/28/required-or-
not) or when things that shouldn''t be reloaded are reloaded (this can
be changed by adding files to Dependencies.load_once_paths (see also
http://groups.google.com/group/rubyonrails-core/browse_thread/thread/710868b1292c737f/9e39c0716569a355?lnk=gst&q=module+tree#9e39c0716569a355).
In your case I''d guess the latter - you''re extending something
like a
plugin (which isn''t reloaded between requests) with something that is
reloaded between requests = trouble.

Fred

> Problem:
> I''ve got a module (AccessControl) in RAILS_ROOT/lib that extends
my
> controllers (which inherit from ResourceController) and adds
> functionality to AuthenticatedSystem.  In development mode, this works
> fine via requests through the browser. However, once I try to consume
> the resources with ActiveResource, the first request succeeds and the
> next request fails with the following error:
>
> ArgumentError (A copy of AccessControl has been removed from the module
> tree but is still active!):
>    
/opt/local/lib/ruby/gems/1.8/gems/activesupport-2.1.1/lib/active_support/de
pendencies.rb:250:in
> `load_missing_constant''
>    
/opt/local/lib/ruby/gems/1.8/gems/activesupport-2.1.1/lib/active_support/de
pendencies.rb:468:in
> `const_missing''
>     /lib/access_control.rb:122:in `controller_target''
> ...
>
> I can''t figure out why this would work via the browser but not
through
> ActiveResource. The only thing that''s different, if I understand
it
> correctly, are the headers:
>     Accept: application/xml
>     Content-Type: application/xml
>
> Why would that make a difference? Not only that, the error is
> originating in the class it says it can''t find. Does anyone
understand
> why this might be the case?
> --
> Posted viahttp://www.ruby-forum.com/.
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>ArgumentError (A copy of AccessControl has been removed from the module tree
but is still active!):
Check your environments/development.rb for config.cache_classes and try 
setting it to true:
config.cache_classes = true #false

It worked for me. It should also help, if you''re using RubyInline and 
have created some C/C++ methods in a class. In my case, I simply make a 
system call to run an external binary.

You may also want to try and put your code in a gem, as it gets loaded 
every time you start the server, and doesn''t get unloaded.
-- 
Posted via http://www.ruby-forum.com/.

Sorry, forgot to mention. You need to restart the server after modifying 
the config file (and will have to restart it every time you make any 
changes to your classes, too).
-- 
Posted via http://www.ruby-forum.com/.

> A copy of Tracker has been removed from the module tree but is still
> active!
> 
> After this happens, I have to reboot my development server before it
> will respond again.
> 
> Any ideas how or why this is happening?
Appears that it can occur when a plugin [which isn''t reloaded] keeps a 
reference to a normal class [which is reloaded].

ex: engines don''t reload, normal app does, if there was any 
intermingling boom!
http://groups.google.com/group/rubyonrails-core/browse_thread/thread/9067bce01444fb24#

"a copy of OrderHelper has been removed from the module tree"

I think that''s what happens to me, anyway.
So much for the usefulness of dev. mode :)

-r
-- 
Posted via http://www.ruby-forum.com/.