Immediately fetch another batch when a full set of job is returned #663
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Jobs can often be stuck on queues for a long while when jobs are sporadically enqueued in large batches. Prior to this change jobs would be fetched every FetchPollInterval (default 1s) unless new jobs were enqueued. This change reduces that to FetchCooldown (default 100ms) when a full set of jobs is returned implying that there may be more in the queue.
See #652 for benchmarks and further discussion.