Backgroundrb devel - Feb 2007 - failed to find slave socket - (RuntimeError)

Hi everyone,

I''ve a class that try to spawn two workers, every 5 seconds.

The code is something like:

while true do
	MiddleMan.new_worker(:class => :researches_worker,:job_key  
=> :researches)
	MiddleMan.new_worker(:class => :products_worker,:job_key => :products)
	sleep(5)
end

I''m using ":job_key", so if a worker hasn''t already
ended its work
after five seconds, it''s not duplicated.

The code inside the worker is something like:

class ResearchesWorker < BackgrounDRb::Worker::RailsBase
	def do_work(args)
		completed = RunningResearch.find(:all,:conditions => ["endtime  
< ?",Time.now])
		for complete in completed
			complete.complete
		end
		self.delete
	end
end
ResearchesWorker.register

After 4 or 5 minutes of working, the worker stops to respond and i''ve  
this error in the log file:

20070222-15:13:37 (15574) failed to find slave socket - (RuntimeError)
20070222-15:13:37 (15574) /usr/local/lib/ruby/gems/1.8/gems/ 
slave-1.2.0/lib/slave.rb:435:in `initialize''
20070222-15:13:37 (15574) /Users/abernesco/Documents/ruby/alfaomega/ 
vendor/plugins/backgroundrb/server/lib/backgroundrb/middleman.rb: 
210:in `new''
20070222-15:13:37 (15574) /Users/abernesco/Documents/ruby/alfaomega/ 
vendor/plugins/backgroundrb/server/lib/backgroundrb/middleman.rb: 
210:in `new_worker''
20070222-15:13:37 (15574) /Users/abernesco/Documents/ruby/alfaomega/ 
vendor/plugins/backgroundrb/server/lib/backgroundrb/thread_pool.rb: 
36:in `dispatch''
20070222-15:13:37 (15574) /Users/abernesco/Documents/ruby/alfaomega/ 
vendor/plugins/backgroundrb/server/lib/backgroundrb/thread_pool.rb: 
22:in `initialize''
20070222-15:13:37 (15574) /Users/abernesco/Documents/ruby/alfaomega/ 
vendor/plugins/backgroundrb/server/lib/backgroundrb/thread_pool.rb: 
22:in `new''
20070222-15:13:37 (15574) /Users/abernesco/Documents/ruby/alfaomega/ 
vendor/plugins/backgroundrb/server/lib/backgroundrb/thread_pool.rb: 
22:in `dispatch''
20070222-15:13:37 (15574) /Users/abernesco/Documents/ruby/alfaomega/ 
vendor/plugins/backgroundrb/server/lib/backgroundrb/middleman.rb: 
199:in `new_worker''


I''ve try to keep the workers class as simple and light as i can...  
any advice about?

Thanks,
ale.

Hi-

	You are trying to spawn new workers too fast for the new  
architecture in bdrb. With a job like this that you want to run every  
5 seconds you are way better of creating a single worker that lives  
forever and just does a loop and sleep then does the work you want.

	Trying to spawn new workers every 5 seconds will work with the old  
version of the plugin but not with the new version.  Try something  
more like this:

class ResearchesWorker < BackgrounDRb::Worker::RailsBase
	def do_work(args)
             loop {
		completed = RunningResearch.find(:all,:conditions => ["endtime  
< ?",Time.now])
		for complete in completed
			complete.complete
		end
               sleep 5
	     }
	end
end
ResearchesWorker.register


	Then just have this worker get started at server boot time or  
whatever and run forever.

-Ezra


On Feb 22, 2007, at 6:29 AM, Alessio Bernesco L?vore wrote:
> Hi everyone,
>
> I''ve a class that try to spawn two workers, every 5 seconds.
>
> The code is something like:
>
> while true do
> 	MiddleMan.new_worker(:class => :researches_worker,:job_key
> => :researches)
> 	MiddleMan.new_worker(:class => :products_worker,:job_key  
> => :products)
> 	sleep(5)
> end
>
> I''m using ":job_key", so if a worker hasn''t
already ended its work
> after five seconds, it''s not duplicated.
>
> The code inside the worker is something like:
>
> class ResearchesWorker < BackgrounDRb::Worker::RailsBase
> 	def do_work(args)
> 		completed = RunningResearch.find(:all,:conditions => ["endtime
> < ?",Time.now])
> 		for complete in completed
> 			complete.complete
> 		end
> 		self.delete
> 	end
> end
> ResearchesWorker.register
>
> After 4 or 5 minutes of working, the worker stops to respond and
i''ve
> this error in the log file:
>
> 20070222-15:13:37 (15574) failed to find slave socket - (RuntimeError)
> 20070222-15:13:37 (15574) /usr/local/lib/ruby/gems/1.8/gems/
> slave-1.2.0/lib/slave.rb:435:in `initialize''
> 20070222-15:13:37 (15574) /Users/abernesco/Documents/ruby/alfaomega/
> vendor/plugins/backgroundrb/server/lib/backgroundrb/middleman.rb:
> 210:in `new''
> 20070222-15:13:37 (15574) /Users/abernesco/Documents/ruby/alfaomega/
> vendor/plugins/backgroundrb/server/lib/backgroundrb/middleman.rb:
> 210:in `new_worker''
> 20070222-15:13:37 (15574) /Users/abernesco/Documents/ruby/alfaomega/
> vendor/plugins/backgroundrb/server/lib/backgroundrb/thread_pool.rb:
> 36:in `dispatch''
> 20070222-15:13:37 (15574) /Users/abernesco/Documents/ruby/alfaomega/
> vendor/plugins/backgroundrb/server/lib/backgroundrb/thread_pool.rb:
> 22:in `initialize''
> 20070222-15:13:37 (15574) /Users/abernesco/Documents/ruby/alfaomega/
> vendor/plugins/backgroundrb/server/lib/backgroundrb/thread_pool.rb:
> 22:in `new''
> 20070222-15:13:37 (15574) /Users/abernesco/Documents/ruby/alfaomega/
> vendor/plugins/backgroundrb/server/lib/backgroundrb/thread_pool.rb:
> 22:in `dispatch''
> 20070222-15:13:37 (15574) /Users/abernesco/Documents/ruby/alfaomega/
> vendor/plugins/backgroundrb/server/lib/backgroundrb/middleman.rb:
> 199:in `new_worker''
>
>
> I''ve try to keep the workers class as simple and light as i can...
> any advice about?
>
> Thanks,
> ale.
> _______________________________________________
> Backgroundrb-devel mailing list
> Backgroundrb-devel at rubyforge.org
> http://rubyforge.org/mailman/listinfo/backgroundrb-devel
>
-- Ezra Zygmuntowicz 
-- Lead Rails Evangelist
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