releases: add TiDB 3.0.19 release notes (#3952) (#3972)

Signed-off-by: ti-srebot <ti-srebot@pingcap.com>

TOC.md

@@ -540,6 +540,7 @@
     + [3.1.0-beta.1](/releases/release-3.1.0-beta.1.md)
     + [3.1.0-beta](/releases/release-3.1.0-beta.md)
   + v3.0
+    + [3.0.19](/releases/release-3.0.19.md)
     + [3.0.18](/releases/release-3.0.18.md)
     + [3.0.17](/releases/release-3.0.17.md)
     + [3.0.16](/releases/release-3.0.16.md)

releases/release-3.0.19.md

@@ -0,0 +1,52 @@
+---
+title: TiDB 3.0.19 Release Notes
+---
+
+# TiDB 3.0.19 Release Notes
+
+Release date: September 25, 2020
+
+TiDB version: 3.0.19
+
+## Compatibility Changes
+
++ PD
+
+    - Change the import path from `pingcap/pd` to `tikv/pd` [#2779](https://github.com/pingcap/pd/pull/2779)
+    - Change the copyright information from `PingCAP, Inc` to `TiKV Project Authors` [#2777](https://github.com/pingcap/pd/pull/2777)
+
+## Improvements
+
++ TiDB
+
+    - Mitigate the impact of failure recovery on QPS performance [#19764](https://github.com/pingcap/tidb/pull/19764)
+    - Support adjusting the concurrency of the `union` operator [#19885](https://github.com/pingcap/tidb/pull/19885)
+
++ TiKV
+
+    - Set `sync-log` to `true` as a nonadjustable value [#8636](https://github.com/tikv/tikv/pull/8636)
+
++ PD
+
+    - Add an alert rule for PD restart [#2789](https://github.com/pingcap/pd/pull/2789)
+
+## Bug Fixes
+
++ TiDB
+
+    - Fix the query error that occurs when the `slow-log` file does not exist [#20050](https://github.com/pingcap/tidb/pull/20050)
+    - Add the privilege check for `SHOW STATS_META` and `SHOW STATS_BUCKET` [#19759](https://github.com/pingcap/tidb/pull/19759)
+    - Forbid changing the decimal type to the integer type [#19681](https://github.com/pingcap/tidb/pull/19681)
+    - Fix the issue that the constraint is not checked when altering the `ENUM`/`SET` type column [#20045](https://github.com/pingcap/tidb/pull/20045)
+    - Fix the bug that tidb-server does not release table locks after a panic [#20021](https://github.com/pingcap/tidb/pull/20021)
+    - Fix the bug that the `OR` operator is not handled correctly in the `WHERE` clause [#19901](https://github.com/pingcap/tidb/pull/19901)
+
++ TiKV
+
+    - Fix the bug that TiKV panics when parsing responses with missing reason phrases [#8540](https://github.com/tikv/tikv/pull/8540)
+
++ Tools
+
+    + TiDB Lightning
+
+        - Fix the issue that the TiDB Lightning process does not exit in time when encountering illegal UTF characters in CSV in the strict mode [#378](https://github.com/pingcap/tidb-lightning/pull/378)

releases/release-notes.md

@@ -33,6 +33,7 @@ aliases: ['/docs/stable/releases/release-notes/','/docs/v4.0/releases/release-no
 
 ## 3.0
 
+- [3.0.19](/releases/release-3.0.19.md)
 - [3.0.18](/releases/release-3.0.18.md)
 - [3.0.17](/releases/release-3.0.17.md)
 - [3.0.16](/releases/release-3.0.16.md)