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TiFlash causes heavy PD pressure when there are many regions #38570

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#38571
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TiFlash causes heavy PD pressure when there are many regions#38570
#38571
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affects-6.1This bug affects the 6.1.x(LTS) versions.component/tiflashseverity/moderatetype/bugThe issue is confirmed as a bug.
@hehechen

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@hehechen
hehechen
opened on Oct 20, 2022

Bug

Currently when there are many regions, TiFlash may cause high PD CPU usage.

After this PR merged, TiDB can get TiFlash replica table region count by PD new API /pd/api/v1/stats/region\?count to reduce the overhead of PD when there are many regions.

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    affects-6.1This bug affects the 6.1.x(LTS) versions.component/tiflashseverity/moderatetype/bugThe issue is confirmed as a bug.

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