Shirly

请按照 [审核标准](https://github.com/pingcap-incubator/tidb-in-action/blob/master/README.md) 审核以下章节： 第二部分 [1.3 集群扩容缩容](https://github.com/pingcap-incubator/tidb-in-action/tree/master/session2/chapter1/tidb-scale.md)

请按照 [审核标准](https://github.com/pingcap-incubator/tidb-in-action/blob/master/README.md) 审核以下章节： 第二部分 [1.2.8 TiDB-Operator 升级](https://github.com/pingcap-incubator/tidb-in-action/tree/master/session2/chapter1/tidb-operator-upgrade.md)

请按照 [审核标准](https://github.com/pingcap-incubator/tidb-in-action/blob/master/README.md) 审核以下章节： 第二部分 [1.2.4 访问 Kubernetes 上的 TiDB 集群及其监控](https://github.com/pingcap-incubator/tidb-in-action/tree/master/session2/chapter1/tidb-operator-access-monitoring.md)

pd-client: share the connection when GetStoreMinResolvedTS from PD

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Hi, currently, we try to `GetStoreMinResolvedTS` for all stores from PD every 2 seconds https://github.com/tikv/client-go/blob/719e6456f7d5d59d45b70b77a36b450b6ce41c86/tikv/kv.go#L602-L607 Here we use http request and do not share the connections. https://github.com/tikv/client-go/blob/719e6456f7d5d59d45b70b77a36b450b6ce41c86/util/pd.go#L89-L94 This will be...

[参赛项目] 基于 TiDB + Flink + Pravega 网约车实时智能调度系统

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## 项目简述 在海量乘客和司机的背景下，当乘客通过网约车平台开始叫车时，系统能够根据当前周围车辆调度情况，实时智能分配网约车到乘客。本项目将基于 TiDB + Flink + Pravega 的架构，提供在高密度、覆盖广的运力背景下，为网约车服务提供一个强大的实时智能调度系统，快速计算出哪个车、以什么路线能更快的接送乘客。 ## 背景 数字化时代，网约车服务的出现极大地优化了资源的配置，提高资源的利用率，提供海量工作机会的同时也为人类的出行提供了极大的便利。 为了提高网约车服务的质量，更大的提升资源配置，从乘客和司机的角度出发，出现了以下基本需求： #### 对乘客而言，最常见的期望如下： - 能够在最短的时间内坐上车（叫车速度快，距离短）。 - 到达目的的时间最快（躲避拥堵&选最优路径）。 - 到达目的的成本最低（避开高速&跑的近）。 …… 北京网约车需求动图：  #### 对司机而言，最基本的需求如下： - 能够在成本最低的情况下接到乘客（接单距离相对行程距离足够短）。 - 尽量能避免空车回，如能够选择想去的目的地，如离自己家近一些。...

Could we move all images into one directory?

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Could we move all images into one directory? By the way, png is big, could we convert it to jpg to speed up the page loading?

Could we use Analytics tools to better understand our readers?

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Could we use Analytics tools like google or baidu(in China) to better understand our readers?

Evict-leader should stop leader transfer into stores with 'reject-leader' label while not

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## Bug Report it seems the command of `evict-leader` does not stop other leaders transfer into it. ### What did you do? 30 tikv/3pd/3tidb 1. pd-ctl config set label-property reject-leader...

## Bug Report when we try to add new placement-rule into the cluster, we would use the following function to check whether the new rule has conflictions with some exist...

schedule/placement/fit: cache the match info for rules to peers

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### What problem does this PR solve? Issue Number: Close #5276 ### Check List Tests - Unit test - benchmark #### current branch ``` ➜ placement git:(fit_cache) ✗ go test...