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Take more than 5 hours to merge empty region after drop 6T data #12421

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@mayjiang0203

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What version of TiKV are you using?

[2022/04/23 23:53:15.874 +08:00] [INFO] [client.go:376] ["Cluster version information"] [type=tikv] [version=6.0.0-alpha] [git_hash=ed7e1aa945d9ada9dc3ad3bd6420a9879d49ed44]

What operating system and CPU are you using?

Steps to reproduce

What did you expect?

Since there are only less than 50G data during region merge, should not cost so much time.

What did happened?

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affects-5.4This bug affects the 5.4.x(LTS) versions.affects-6.1This bug affects the 6.1.x(LTS) versions.severity/majortype/bugThe issue is confirmed as a bug.

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