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add v8.2.0 release notes #17514

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259 changes: 259 additions & 0 deletions releases/release-8.2.0.md
Original file line number Diff line number Diff line change
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---
title: TiDB 8.2.0 Release Notes
summary: 了解 TiDB 8.2.0 版本的新功能、兼容性变更、改进提升,以及错误修复。
---

# TiDB 8.2.0 Release Notes

发版日期:2024 年 x 月 x 日

TiDB 版本:8.2.0

试用链接:[快速体验](https://docs.pingcap.com/zh/tidb/v8.2/quick-start-with-tidb) | [下载离线包](https://cn.pingcap.com/product-community/?version=v8.2.0-DMR#version-list)

在 8.2.0 版本中,你可以获得以下关键特性:

## 功能详情

### 可扩展性

* 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)。

### 性能

* 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)。

* 支持下推以下字符串函数到 TiKV [#50601](https://github.com/pingcap/tidb/issues/50601) @[dbsid](https://github.com/dbsid) **tw@Oreoxmt** <!--1663-->

* `JSON_ARRAY_APPEND()`
* `JSON_MERGE_PATCH()`
* `JSON_REPLACE()`

更多信息,请参考[用户文档](/functions-and-operators/expressions-pushed-down.md)。

* TiDB 支持并行排序功能 [#49217](https://github.com/pingcap/tidb/issues/49217) [#50746](https://github.com/pingcap/tidb/issues/50746) @[xzhangxian1008](https://github.com/xzhangxian1008) **tw@Oreoxmt** <!--1665-->

在 v8.2.0 版本之前,TiDB 进行排序计算时只能以非并行的方式进行处理,当需要对大量数据进行排序时,查询性能收到影响。
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在 v8.2.0 版本中,TiDB 支持并行排序功能,所有的排序计算性能都将得到提升。该功能不需要单独开启,TiDB 将根据变量 [`tidb_executor_concurrency`](/system-variables.md#tidb_executor_concurrency-从-v50-版本开始引入) 的设定,确定使用并行方式或非并行方式进行排序。
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* TiDB 的并发 HashAgg 算法支持数据落盘(GA)[#35637](https://github.com/pingcap/tidb/issues/35637) @[xzhangxian1008](https://github.com/xzhangxian1008) **tw@Oreoxmt** <!--1842-->

在 v8.0.0 中,TiDB 以实验特性发布了并发 HashAgg 算法支持数据落盘功能。

在 v8.2.0 中,TiDB 正式发布该功能。TiDB 在使用并发 HashAgg 算法时,将根据内存使用情况自动触发数据落盘,从而兼顾性能和数据处理量。该功能默认打开,变量 `tidb_enable_concurrent_hashagg_spill` 将被废弃。

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### 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)。

### 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)。

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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)。

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### 可观测性

* 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)。

### 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)。

* 增强 TiFlash 日志脱敏 [#8977](https://github.com/pingcap/tiflash/issues/8977) @[JaySon-Huang](https://github.com/JaySon-Huang) **tw@Oreoxmt** <!--1818-->

在 v8.0,0 版本,TiDB 增强了日志脱敏功能,可以控制是否对日志信息进行脱敏,以实现在不同场景下安全使用 TiDB 日志,提升了使用日志脱敏能力的安全性和灵活性。在 v8.2.0 版本中,TiFlash 进行了类似的日志脱敏功能增强。要使用此功能,需要将 tiflash-server 中 `security.redact_info_log` 配置项的值均设为 `MARKER`。
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更多信息,请参考[用户文档](/tiflash/tiflash-configuration.md#配置文件-tiflashtoml)。

### 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)。

## 兼容性变更

> **注意:**
>
> 以下为从 v8.1.0 升级至当前版本 (v8.2.0) 所需兼容性变更信息。如果从 v8.0.0 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。

### 行为变更

* 行为变更 1
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* 行为变更 2

### MySQL 兼容性

* 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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| [`tidb_enable_historical_stats`](/system-variables.md#tidb_enable_historical_stats) | 修改 | 自 v8.2.0,默认不保存历史统计信息,避免潜在的稳定性问题 |
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| [`tidb_analyze_skip_column_types`](/system-variables.md#tidb_analyze_skip_column_types-从-v720-版本开始引入) | 修改 | 默认设置下,TiDB 不会收集类型为 `mediumtext` 和 `longtext` 的列,避免潜在的 OOM 风险。 |
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| | | |
| | | |

### 系统表

### 其他

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## 离线包变更

## 废弃功能

* 废弃功能 1

* 变量 [`tidb_enable_concurrent_hashagg_spill`](/system-variables.md#tidb_enable_concurrent_hashagg_spill-从-v800-版本开始引入) 将被废弃。

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## 改进提升

+ TiDB

- 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)
- 优化客户端读取数据超时无法终止查询的问题 [#44009](https://github.com/pingcap/tidb/issues/44009) @[wshwsh12](https://github.com/wshwsh12) **tw@Oreoxmt** <!--1636-->
- 优化对大数据量的表进行简单查询的性能 [#53850](https://github.com/pingcap/tidb/issues/53850) @[you06](https://github.com/you06) **tw@Oreoxmt** <!--1561-->
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这个表达没有问题,但是涵盖的范围可能过大,有的简单查询并不在这个优化的范畴之内

改成 “优化对大数据量的表进行简单查询时定位数据分布的性能” 这样如何?

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@joey-yez PTAL

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LGTM

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+ TiKV

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

- 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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+ Tools

+ Backup & Restore (BR)

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+ TiCDC

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+ TiDB Data Migration (DM)

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+ TiDB Lightning

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+ TiUP

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## 错误修复

+ TiDB

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+ TiKV

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+ PD

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+ TiFlash

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+ Tools

+ Backup & Restore (BR)

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+ TiCDC

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+ TiDB Data Migration (DM)

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+ TiDB Lightning

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+ TiUP

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## 贡献者

感谢来自 TiDB 社区的贡献者们:

- [贡献者 GitHub ID]()
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