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The sync load could not decrease to zero, even though there is no stats cache eviction at all #65050

@0xPoe

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@0xPoe

Bug Report

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1. Minimal reproduce step (Required)

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As you can see, there is no stats cache eviction at all, yet it continued to attempt a sync load after the workload had been running for 24 hours.

2. What did you expect to see? (Required)

The sync load QPS should gradually drop to 0.

3. What did you see instead (Required)

It continued to try to sync loads.

4. What is your TiDB version? (Required)

v8.5.4,master

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