No `data` available to workers under ruby1.8 #3

jperville opened this Issue Jul 21, 2011 · 5 comments


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I encountered the following exception when running the "make sandwich" examples with ruby1.8.

If I run ruby worker_client.rb 1 (to request only one sandwich because I'm not very hungry) worker code will appear to behave as intended the first time. But when I ask for another sandwich (either by running my command line again, or by asking for 2 sandwiches after restarting the worker) the second time, just after the "Finished" displays I see the following exception in the console where I have been running the worker.

julien@dev:/data/sandbox7$ ruby worker.rb
I, [2011-07-21T07:35:26.577251 #23390]  INFO -- : Started Worker
Prefetch: 1
I, [2011-07-21T07:35:26.578369 #23390]  INFO -- : AMQP Subscribed: queue=make.sandwich exchange=
I, [2011-07-21T07:35:31.311294 #23390]  INFO -- : JOB (2c285500-9589-012e-61b3-08002795e76b) Make sandwich with white bread
D, [2011-07-21T07:35:36.320343 #23390] DEBUG -- : Finished Job in 5.01775193214417 seconds
worker.rb:23: warning: Object#id will be deprecated; use Object#object_id
worker.rb:23: undefined local variable or method `data' for Cloudist:Module (NameError)
        from /var/lib/gems/1.8/gems/amq-client-0.7.0.alpha9/lib/amq/client/exchange.rb:101:in `call'
        from /var/lib/gems/1.8/gems/amq-client-0.7.0.alpha9/lib/amq/client/exchange.rb:101:in `publish'
        from /var/lib/gems/1.8/gems/amqp-0.8.0.rc9/lib/amqp/exchange.rb:457:in `publish'
        from /var/lib/gems/1.8/gems/eventmachine-0.12.10/lib/em/deferrable.rb:47:in `call'
        from /var/lib/gems/1.8/gems/eventmachine-0.12.10/lib/em/deferrable.rb:47:in `callback'
        from /var/lib/gems/1.8/gems/amqp-0.8.0.rc9/lib/amqp/channel.rb:253:in `once_open'
        from /var/lib/gems/1.8/gems/amqp-0.8.0.rc9/lib/amqp/exchange.rb:456:in `publish'
        from /var/lib/gems/1.8/gems/eventmachine-0.12.10/lib/eventmachine.rb:996:in `call'
        from /var/lib/gems/1.8/gems/eventmachine-0.12.10/lib/eventmachine.rb:996:in `run_deferred_callbacks'
        from /var/lib/gems/1.8/gems/eventmachine-0.12.10/lib/eventmachine.rb:996:in `each'
        from /var/lib/gems/1.8/gems/eventmachine-0.12.10/lib/eventmachine.rb:996:in `run_deferred_callbacks'
        from /var/lib/gems/1.8/gems/eventmachine-0.12.10/lib/eventmachine.rb:256:in `run_machine'
        from /var/lib/gems/1.8/gems/eventmachine-0.12.10/lib/eventmachine.rb:256:in `run'
        from /var/lib/gems/1.8/gems/amqp-0.8.0.rc9/lib/amqp/connection.rb:39:in `start'
        from /var/lib/gems/1.8/gems/cloudist-0.4.3/lib/cloudist.rb:61:in `start'
        from worker.rb:19

If I run the same worker with ruby 1.9.2 (and the same version of installed gems) everything seems to run fine.

I have the following versions installed:

julien@dev:/data/sandbox7$ ruby -v
ruby 1.8.7 (2010-08-16 patchlevel 302) [x86_64-linux]
julien@dev:/data/sandbox7$ gem -v
julien@dev:/data/sandbox7$ gem list

*** LOCAL GEMS ***

activesupport (3.0.9)
amq-client (0.7.0.alpha9)
amq-protocol (0.7.0)
amqp (0.8.0.rc9)
bundler (1.0.12)
cloudist (0.4.3)
eventmachine (0.12.10)
hashie (1.0.0)
i18n (0.6.0)
json (1.4.6)
macaddr (1.0.0)
uuid (2.3.2)

I can work around the problem by running the worker code with ruby 1.9.2 but I would prefer to work with 1.8, as I am trying to build an application with QtRuby that will also make good use of cloudist.



ivanvanderbyl commented Jul 22, 2011


Thanks for pointing that out. It doesn't look like it will be hard to fix, I'll see if I can replicate and fix it shortly.

Hello ivan,

For information, I upgraded my amq* gems to the latest from github and the problem disappeared with ruby 1.8.
I now use the following version of amq gems :

julien@dev:/data/sandbox7$ gem list | grep amq
amq-client (0.7.0.beta10.pre)
amq-protocol (0.7.0.alpha8.pre)
amqp (0.8.0.rc14.pre)
amqp-spec (0.3.8)

I cross fingers for amq gems to hit 0.8 so that I can use official gems again.


@jperville if you are using amqp 0.8.0.rc14.pre (current master), please also use amq-client master. And amq-protocol 0.8.0 is now on, I am slowly phasing out of pre-release dependencies (rc14 won't have any) because rubygems 1.3.7 cannot compare them properly.

Also, please follow @rubyamqp, many smallish news that do not deserve ruby-amqp Google Group or rabbitmq-discuss announcements are posted there. amqp gem 0.8.0 is pretty close, however, I am investigating one rare sporadic concurrency issue and will not release RC14 until I fully understand & resolve it.

Thank you very much michael. I will follow the twitter.

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