A batch of coprocessor requests(indexscan mostly) occurs every five minutes under low load.
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Description
## Bug Report
Please answer these questions before submitting your issue. Thanks!
### 1. Minimal reproduce step (Required)
when there are no external requests, or low load.
### 2. What did you expect to see? (Required)
SQL very fast and the QPS of coprocessor should similar with external requests.
### 3. What did you see instead (Required)
A batch of coprocessor requests(indexscan mostly) occurs every five minutes under low load.
most of the coprocessor request are `indexscan` and the left are `tablescan`
most are batch-index only
### 4. What is your TiDB version? (Required)
since v4.0.0 to master
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