GitHub user jishengming1 added a comment to the discussion: In the same link, 
if request 1 blocks, will all subsequent requests block? Is request2 affected 
by request1?

> The main reason is Kvrocks stores its data in disk instead of memory, so 
> can't just simply keep the key counter in memory. And it's impossible to 
> store the row count like MySQL since we supports key expire feature, so we 
> can't know how many keys are expired before scanning the database.

Got it, thanks a lot!

GitHub link: 
https://github.com/apache/incubator-kvrocks/discussions/1243#discussioncomment-4965499

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