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More incremental active expired keys collection process.
If a large amonut of keys are all expiring about at the same time, the "active" expired keys collection cycle used to block as far as the percentage of already expired keys was >= 25% of the total population of keys with an expire set. This could block the server even for many seconds in order to reclaim memory ASAP. The new algorithm uses at max a small amount of milliseconds per cycle, even if this means reclaiming the memory less promptly it also means a more responsive server.
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