GitHub user git-hulk added a comment to the discussion: pollupdate command not 
work as expected

@ninuxer Sorry for the late reply due to missing this message.

> flushdb and compact, then scan cannot display the keys, but pollupdate can

The POLLUPDATE command is used to poll the write updates, so it's expected to 
see intermediate states. For example, you send the request: `SET a b; DEL a;` 
to Kvrocks, and POLLUPDATE will receive two events `SET` and `DEL`.

GitHub link: 
https://github.com/apache/kvrocks/discussions/2906#discussioncomment-13245496

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