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releases: add TiDB 3.0.19 release notes (pingcap#4564)
* releases: add TiDB 3.0.19 release notes * Update release-3.0.19.md * Update releases/release-3.0.19.md Co-authored-by: Lei Zhao <zlwgx1023@gmail.com> * Update releases/release-3.0.19.md Co-authored-by: Lei Zhao <zlwgx1023@gmail.com> * Update release-3.0.19.md * commit suggestions from wjhuang201 * Update releases/release-3.0.19.md * add PD notes * Apply suggestions from code review * Update releases/release-3.0.19.md Co-authored-by: Lei Zhao <zlwgx1023@gmail.com> * Update releases/release-3.0.19.md * Update releases/release-3.0.19.md Co-authored-by: TomShawn <41534398+TomShawn@users.noreply.github.com> Co-authored-by: Lei Zhao <zlwgx1023@gmail.com>
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‎TOC.md‎

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- [3.1.0-beta.1](/releases/release-3.1.0-beta.1.md)
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- [3.1.0-beta](/releases/release-3.1.0-beta.md)
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+ v3.0
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- [3.0.19](/releases/release-3.0.19.md)
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- [3.0.18](/releases/release-3.0.18.md)
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- [3.0.17](/releases/release-3.0.17.md)
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- [3.0.16](/releases/release-3.0.16.md)

‎releases/release-3.0.19.md‎

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title: TiDB 3.0.19 Release Notes
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---
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# TiDB 3.0.19 Release Notes
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发版日期:2020 年 9 月 25 日
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TiDB 版本:3.0.19
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## 兼容性变化
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+ PD
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- 更改 PD 的导入路径 `pingcap/pd` 为 `tikv/pd` [#2779](https://github.com/pingcap/pd/pull/2779)
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- 更改 PD 的 copyright 信息 `PingCAP, Inc` 为 `TiKV Project Authors` [#2777](https://github.com/pingcap/pd/pull/2777)
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## 提升改进
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+ TiDB
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- 缓解故障恢复对 QPS 的影响 [#19764](https://github.com/pingcap/tidb/pull/19764)
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- 支持调整 `union` 运算符的并发数 [#19885](https://github.com/pingcap/tidb/pull/19885)
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+ TiKV
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- 永久开启 `sync-log` [#8636](https://github.com/tikv/tikv/pull/8636)
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+ PD
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- 添加关于 PD 重启的告警规则 [#2789](https://github.com/pingcap/pd/pull/2789)
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## Bug 修复
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+ TiDB
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- 修复 `slow-log` 文件不存在导致查询出错的问题 [#20050](https://github.com/pingcap/tidb/pull/20050)
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- 添加对 `SHOW STATS_META` 和 `SHOW STATS_BUCKET` 这两个命令的权限检查 [#19759](https://github.com/pingcap/tidb/pull/19759)
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- 禁止将 Decimal 类型改成 Integer 类型 [#19681](https://github.com/pingcap/tidb/pull/19681)
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- 修复更改 `ENUM`/`SET` 类型的列时没有检查限制的问题 [#20045](https://github.com/pingcap/tidb/pull/20045)
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- 修复 tidb-server 在 panic 后没有释放 table lock 的问题 [#20021](https://github.com/pingcap/tidb/pull/20021)
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- 修复 `OR` 运算符在 `WHERE` 子句中没有正确处理的问题 [#19901](https://github.com/pingcap/tidb/pull/19901)
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+ TiKV
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- 修复 TiKV 的 status server 解析响应出错导致 panic 的问题 [#8540](https://github.com/tikv/tikv/pull/8540)
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+ Tools
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+ TiDB Lightning
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- 修复了严格模式下 CSV 中遇到不合法 UTF 字符集没有及时退出进程的问题 [#378](https://github.com/pingcap/tidb-lightning/pull/378)

‎releases/release-notes.md‎

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## 3.0
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- [3.0.19](/releases/release-3.0.19.md)
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- [3.0.18](/releases/release-3.0.18.md)
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- [3.0.17](/releases/release-3.0.17.md)
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- [3.0.16](/releases/release-3.0.16.md)

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