Limit worker queue size #226
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This fixes an issue where long-running tasks could get assigned to a worker which would start the work but then also accept other tasks before the work is done.
Most of the time it makes sense for a worker to accept one message at a time, except for deployments with specialized workers, like an index-worker which might have a higher prefetch count. This is why we set the local_queue maxsize to the maximum of the prefetch count for that given worker.