Today I learned: Python’s concurrency-safe queue structures have a hard limit of 32,768 items. I totally did not deadlock a piece of code by not paying attention to that, why do you ask?
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Debugging it was a fun story, too. At first I thought it was something else stalling out (since all the failures happened at suspicious powers of 2). Eventually isolated just the queue setup and saw it start to block put() at 32,768 items.
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So then I tried creating a queue with a higher maxsize, and got an immediate exception saying that’s not allowed. Turns out to be a hard-coded limit. Perhaps this should be documented better.
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(it’s not entirely Python’s fault, since this is actually handed off to system-specific non-Python semaphore implementations, and that’s where the hard-coded limit actually lives, but still, could be documented better)
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I've had pull requests accepted to Python's documentation - it made me feel very chuffed
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I’ve got a few things I’d like to fix. Main thing holding me back is the process of filing a bug; BPO is not a friendly thing to use.
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