Feature Request

Describe your feature request related problem

As user reports, there are about 200w regions, and the workload is uniform. so there are many region need to update if the flow changed. the qps update_cache is about 9k, which means 9k/s need Locks and more operator in heartbeat needRLocks.

Describe the feature you'd like

• reduce the update operations
• Alleviate lock contention

Describe alternatives you've considered

• add a switch to reduce updates when region flow changed.
• optimize heartbeat with segmented lock

Teachability, Documentation, Adoption, Migration Strategy

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