关于 TiKV 性能调优文档中 grpc-concurrency 默认值的问题

[yanggno]

Change Request

This repository is ONLY used to solve problems related to DOCS-CN.
For other issues (TiDB, TiKV, etc), please move to other repositories.

Please answer the following questions before submitting your issue. Thanks!

1. Describe what you find is inappropriate or missing in the existing docs.

• grpc-concurrency 默认值为4，但在 TiKV 配置项模板中，该配置项默认值为5

2. Describe your suggestion or addition.

• 建议修改 grpc-concurrency 配置项的默认值为5

3. Provide some reference materials (documents, websites, etc) if you could.

• 出错地址：https://docs.pingcap.com/zh/tidb/stable/tune-tikv-thread-performance
• 官方模板：https://docs.pingcap.com/zh/tidb/stable/tikv-configuration-file

[TomShawn]

@Connor1996 PTAL whether the default value of grpc-concurrency should be changed to 5.
@en-jin19 Please follow up on this issue.
Thanks!

[Connor1996]

@TomShawn Yes, the default value of grpc-concurrency should be changed to 5

[TomShawn]

@en-jin19 Could you help create a PR to correct it? Thanks~