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Before, we were relying on `multiprocessing.fork` which can and did regularly cause deadlocks. Now, we use `multiprocess` with the `forkserver` strategy, so we can run consumers in a background process without these deadlocks occurring.
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forkstrategy which was causing regular hangs of the integration test runner. This required making the things we pass aroundpickle-able, and usingmultiprocessinstead ofmultiprocessingso we can pass closures around.