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I was under the impression [1] that a message would only be received more than once if the first attempt at processing failed to complete in the lock time - for example if the queue consumer crashed. Is it more complicated than that?

[1] http://aws.amazon.com/sqs/#functionality

Speaking of celery - I was looking at celery over the weekend. Do you know if its possible to submit jobs from languages other than Python (specifically, I would like to use Java)? I have some Clojure code running on Storm from which I would like to submit tasks to be executed in Python on other machines. Do you know if this is possible with celery? I couldn't really find any information on it.

Sorry, but lol. You had to implement locking on top of a job queueing system to make it work? That's the whole point of a queueing system!!!

You probably didn't realize you had to extend the lock peeiodically.