The TPS of point-get drops to 0 while the QPS remains unchanged
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Description
## Bug Report
Please answer these questions before submitting your issue. Thanks!
### 1. Minimal reproduce step (Required)
1. deploy a tidb cluster with 3 tidb + 3 tikv
2. run ycsb workloadc
### 2. What did you expect to see? (Required)
The TPS metric worked well.
| tidb | tikv| pd|
|---|---|---|
| [9c5981c1401a243af21ff1ba9d219710363a8f2f](https://github.com/pingcap/tidb/commit/9c5981c1401a243af21ff1ba9d219710363a8f2f)|[e106c8dd7237b95e8f26e064856b96b7fe384420](https://github.com/tikv/tikv/commit/e106c8dd7237b95e8f26e064856b96b7fe384420)|[740f15e6529ea7607be801fcc8a5747f96f6585d](https://github.com/tikv/pd/commit/740f15e6529ea7607be801fcc8a5747f96f6585d)|
|tps|qps|
|---|---|
| 74967 | 74942 |
### 3. What did you see instead (Required)
The TPS of point dropped to nearly 0.
| tidb | tikv| pd|
|---|---|---|
| [203e5f2cff1d094166d67a144de3be0aa96bdef5](https://github.com/pingcap/tidb/commit/203e5f2cff1d094166d67a144de3be0aa96bdef5)|[e15796505d01ec56b01bd5a893accd0a186c3e32](https://github.com/tikv/tikv/commit/e15796505d01ec56b01bd5a893accd0a186c3e32)|[78cb08160a8e16a4704c5def5d44a50ae10f6e4c](https://github.com/tikv/pd/commit/78cb08160a8e16a4704c5def5d44a50ae10f6e4c)|
|tps|qps|
|---|---|
|25.2| 75615|
### 4. What is your TiDB version? (Required)
Contributor guide
Assessment
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