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Add v7.2.0 release notes #14154

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253 changes: 253 additions & 0 deletions releases/release-7.2.0.md
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---
title: TiDB 7.2.0 Release Notes
summary: 了解 TiDB 7.2.0 版本的新功能、兼容性变更、改进提升,以及错误修复。
---

# TiDB 7.2.0 Release Notes

发版日期:2023 年 x 月 x 日

TiDB 版本:7.2.0

试用链接:[快速体验](https://docs.pingcap.com/zh/tidb/v7.2/quick-start-with-tidb) | [下载离线包](https://cn.pingcap.com/product-community/)

在 7.2.0 版本中,你可以获得以下关键特性:

<!-- 关键特性表格 placeholder-->

## 功能详情

### 可扩展性

<!-- 请将 **tw@xxx** 中的 xxx 替换为这个 feature 的 writer 的 ID,这个标记会在发布前删除-->

* 功能标题 [#issue号](链接) @[贡献者 GitHub ID](链接) **tw@xxx** <!--1234-->

功能描述(需要包含这个功能是什么、在什么场景下对用户有什么价值、怎么用)

更多信息,请参考[用户文档](链接)。

### 性能

* 功能标题 [#issue号](链接) @[贡献者 GitHub ID](链接) **tw@xxx** <!--1234-->

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功能描述(需要包含这个功能是什么、在什么场景下对用户有什么价值、怎么用)

更多信息,请参考[用户文档](链接)。

* 新增支持下推两个[窗口函数](/tiflash/tiflash-supported-pushdown-calculations.md) 至 TiFlash [#7427](https://github.com/pingcap/tiflash/issues/7427) @[xzhangxian1008](https://github.com/xzhangxian1008) **tw@qiancai** <!--1310-->

* `FIRST_VALUE`
* `LAST_VALUE`

* TiFlash 支持副本选择策略 [#44106](https://github.com/pingcap/tidb/issues/44106) @[XuHuaiyu](https://github.com/XuHuaiyu) **tw@qiancai** <!--1394-->

在 v7.2.0 版本之前,TiFlash 尽量使用所有节点的副本进行数据扫描及 MPP 计算,以提供最强大的性能。在 v7.2.0 版本中,TiFlash 引入副本选择策略,可以根据节点区域属性,选择特定的副本,并调度部分节点进行数据扫描及 MPP 计算。当集群部署在超过一个机房,并且每个机房都拥有完整的 TiFlash 数据副本时,可以只选择当前机房的 TiFlash 副本,在当前机房的 TiFlash 节点中进行数据扫描和 MPP 计算,避免大量跨机房的网络数据传输。新增系统变量 [`tiflash_replica_read`](/system-variables.md#tiflash_replica_read) 用于设定节点选择策略。

更多信息,请参考[用户文档](/system-variables.md#tiflash_replica_read)。

### 稳定性

* 功能标题 [#issue号](链接) @[贡献者 GitHub ID](链接) **tw@xxx** <!--1234-->

功能描述(需要包含这个功能是什么、在什么场景下对用户有什么价值、怎么用)

更多信息,请参考[用户文档](链接)。
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### 高可用

* 功能标题 [#issue号](链接) @[贡献者 GitHub ID](链接) **tw@xxx** <!--1234-->

功能描述(需要包含这个功能是什么、在什么场景下对用户有什么价值、怎么用)

更多信息,请参考[用户文档](链接)。

### SQL 功能

* 功能标题 [#issue号](链接) @[贡献者 GitHub ID](链接) **tw@xxx** <!--1234-->

功能描述(需要包含这个功能是什么、在什么场景下对用户有什么价值、怎么用)

更多信息,请参考[用户文档](链接)。

* TiDB 支持完整的分区类型管理功能 [#42728](https://github.com/pingcap/tidb/issues/42728) @[mjonss](https://github.com/mjonss) **tw@qiancai** <!--1370-->

在 v7.2.0 之前,TiDB 中的分区表不能调整分区类型。从 v7.2.0 开始,TiDB 支持将分区表修改为非分区表、将非分区表修改为分区表、修改分区类型功能。你可以根据需要灵活调整表的分区类型、数量。例如,通过 `ALTER TABLE t PARTITION BY ...` 语句修改分区类型。

更多信息,请参考[用户文档](/partitioned-table.md#分区管理)。

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* LIST 分区表支持 DEFAULT 分区功能 [#42728](https://github.com/pingcap/tidb/issues/42728) @[mjonss](https://github.com/mjonss) **tw@qiancai** <!--1342-->

LIST 分区表必须指定所有的分区,不满足任何分区条件的数据,无法正常写入该表。从 v7.2.0 开始,TiDB 支持 [默认 LIST 分区](/partitioned-table.md#list-分区) 功能。该功能启用时,所有不符合已有 LIST 分区的数据将被保存在默认 LIST 分区中。通过系统变量 `tidb_enable_default_list_partition` 控制是否启用默认 LIST 分区gonna。

更多信息,请参考[用户文档](/partitioned-table.md#list-分区)。

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### 数据库管理

* 功能标题 [#issue号](链接) @[贡献者 GitHub ID](链接) **tw@xxx** <!--1234-->

功能描述(需要包含这个功能是什么、在什么场景下对用户有什么价值、怎么用)

更多信息,请参考[用户文档](链接)。

### 可观测性

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* 功能标题 [#issue号](链接) @[贡献者 GitHub ID](链接) **tw@xxx** <!--1234-->

功能描述(需要包含这个功能是什么、在什么场景下对用户有什么价值、怎么用)

更多信息,请参考[用户文档](链接)。

### 安全

* 功能标题 [#issue号](链接) @[贡献者 GitHub ID](链接) **tw@xxx** <!--1234-->

功能描述(需要包含这个功能是什么、在什么场景下对用户有什么价值、怎么用)

更多信息,请参考[用户文档](链接)。
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### 数据迁移

* 功能标题 [#issue号](链接) @[贡献者 GitHub ID](链接) **tw@xxx** <!--1234-->

功能描述(需要包含这个功能是什么、在什么场景下对用户有什么价值、怎么用)

更多信息,请参考[用户文档](链接)。

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## 兼容性变更

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> **注意:**
>
> 以下为从 v7.0.0 升级至当前版本 (v7.2.0) 所需兼容性变更信息。如果从 v6.6.0 或之前版本升级到当前版本,可能也需要考虑和查看中间版本 release notes 中提到的兼容性变更信息。
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### 行为变更

<!-- 此小节包含 MySQL 兼容性变更-->

* 兼容性 1

* 兼容性 2

### 系统变量

| 变量名 | 修改类型(包括新增/修改/删除) | 描述 |
|--------|------------------------------|------|
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| | | |
| | | |
| | | |
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### 配置文件参数

| 配置文件 | 配置项 | 修改类型 | 描述 |
| -------- | -------- | -------- | -------- |
| | | | |
| | | | |
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| | | | |
| | | | |

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## 废弃功能

## 改进提升

+ TiDB

- note [#issue](链接) @[贡献者 GitHub ID](链接)
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+ TiKV

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- note [#issue](链接) @[贡献者 GitHub ID](链接)
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- note [#issue](链接) @[贡献者 GitHub ID](链接)

+ PD

- note [#issue](链接) @[贡献者 GitHub ID](链接)
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- note [#issue](链接) @[贡献者 GitHub ID](链接)

+ TiFlash

- note [#issue](链接) @[贡献者 GitHub ID](链接)
- note [#issue](链接) @[贡献者 GitHub ID](链接)

+ Tools

+ Backup & Restore (BR)

- note [#issue](链接) @[贡献者 GitHub ID](链接)
- note [#issue](链接) @[贡献者 GitHub ID](链接)

+ TiCDC

- note [#issue](链接) @[贡献者 GitHub ID](链接)
- note [#issue](链接) @[贡献者 GitHub ID](链接)

+ TiDB Data Migration (DM)
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- note [#issue](链接) @[贡献者 GitHub ID](链接)
- note [#issue](链接) @[贡献者 GitHub ID](链接)
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+ TiDB Lightning
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- note [#issue](链接) @[贡献者 GitHub ID](链接)
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  • 优化大表导入下 region 分裂和打散的处理机制 #43510
  • 优化导入遇到 RPC 错误的重试机制 #43291
  • 优化导入时遇到 leader 切换导致的错误的重试机制 #44478
  • 导入完成后通过 SQL 的方式校验 checksum,提升检验的稳定性 #41941
  • 优化宽表导入下 lightning OOM 的问题 43853

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#43510 和 #43291 已经在 v7.1.0 release notes 中出现过了(如下),请确认是否是相同的问题,如果是,就不需要在 7.2 release notes 中写了

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这俩也不用了

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- note [#issue](链接) @[贡献者 GitHub ID](链接)
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+ TiUP

- note [#issue](链接) @[贡献者 GitHub ID](链接)
- note [#issue](链接) @[贡献者 GitHub ID](链接)

## 错误修复

+ TiDB

- note [#issue](链接) @[贡献者 GitHub ID](链接)
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+ TiKV

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+ PD

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+ TiCDC
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+ TiDB Lightning
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  • 修复开启 expression index 且默认值是 uuid 导致 lightning panic 的问题 #44516
  • 修复划分数据文件时任务退出导致 lightning panic 的问题 #43195
  • 修复某些监控面板不显示数据的问题 #43357
  • 修复负载较小的情况下仍可能出现 OOM 的问题 #43728

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#43357 和 #43728 已经在 v7.1.0 release notes 中出现过了(如下),请确认是否是相同的问题,如果是,就不需要在 7.2 release notes 中写了

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ok,这俩不用了

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+ TiUP

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