releases: add tidb v4.0.11 release notes

TOC.md

@@ -525,6 +525,7 @@
   + v5.0
     + [5.0.0-rc](/releases/release-5.0.0-rc.md)
   + v4.0
+    + [4.0.11](/releases/release-4.0.11.md)
     + [4.0.10](/releases/release-4.0.10.md)
     + [4.0.9](/releases/release-4.0.9.md)
     + [4.0.8](/releases/release-4.0.8.md)

releases/release-4.0.11.md

@@ -0,0 +1,150 @@
+---
+title: TiDB 4.0.11 Release Notes
+---
+
+# TiDB 4.0.11 Release Notes
+
+Release date: February 4, 2021
+
+TiDB version: 4.0.11
+
+## Compatibility Changes
+
+## New Features
+
++ TiKV
+
+    - Add `utf8mb4_unicode_ci` implement [#9577](https://github.com/tikv/tikv/pull/9577)
+    - Add `cast_year_as_time` [#9299](https://github.com/tikv/tikv/pull/9299)
+
++ TiFlash
+
+    - A coprocessor thread pool was added to queue coprocessor requests for execution, which can avoid OOM in some cases. Added two configs `cop_pool_size` and `batch_cop_pool_size`, default `NumOfPhysicalCores*2` [#1312](https://github.com/pingcap/tics/pull/1312)
+
+## Improvements
+
++ TiDB
+
+    - Reorder inner joins simplified from outer joins [#22402](https://github.com/pingcap/tidb/pull/22402)
+
++ TiKV
+
+    - Add server info metrics for DBasS [#9591](https://github.com/tikv/tikv/pull/9591)
+    - Grafana dashboards support multiple clusters [#9572](https://github.com/tikv/tikv/pull/9572)
+    - Report RocksDB metrics to TiDB [#9316](https://github.com/tikv/tikv/pull/9316)
+    - Record suspend time for coprocessor task [#9277](https://github.com/tikv/tikv/pull/9277)
+    - Add key and size threshold for load-base-split [#9354](https://github.com/tikv/tikv/pull/9354)
+    - Check whether file exist before importing [#9544](https://github.com/tikv/tikv/pull/9544)
+    - Improve Fast Tune panels [#9180](https://github.com/tikv/tikv/pull/9180)
+
++ TiFlash
+
+    - Optimize the performance of date_format function in TiFlash [#1339](https://github.com/pingcap/tics/pull/1339)
+    - Optimize memory consumption of handling ingest SST
+
+## Bug Fixes
+
++ TiDB
+
+    - Expression: handle duration type infer in least and greatest [#22580](https://github.com/pingcap/tidb/pull/22580)
+    - Fixed LIKE expressions when a single character (`_`) wildcard follows a multiple character wildcard (`%`). [#22575](https://github.com/pingcap/tidb/pull/22575)
+    - Expression: fix type infer for TiDB's builtin compare(least and greatest) [#22562](https://github.com/pingcap/tidb/pull/22562)
+    - Fix a bug that makes the `like` function get the wrong result if pattern string is a Unicode string [#22529](https://github.com/pingcap/tidb/pull/22529)
+    - Fix a bug that point get query does not get the snapshot data when the `@@tidb_snapshot` variable is set. [#22527](https://github.com/pingcap/tidb/pull/22527)
+    - Avoid potential panic when generating hints from joins [#22518](https://github.com/pingcap/tidb/pull/22518)
+    - Convert string to MySQL BIT correctly [#22420](https://github.com/pingcap/tidb/pull/22420)
+    - Fix the 'index out of range ' issue when insert values to `tidb_rowid`. [#22359](https://github.com/pingcap/tidb/pull/22359)
+    - Fix a bug about incorrectly reuse cached plan [#22353](https://github.com/pingcap/tidb/pull/22353)
+    - Fix runtime panic in WEIGHT_STRING function when the length of binary/char is too large [#22332](https://github.com/pingcap/tidb/pull/22332)
+    - Forbidden the invalid generated column with incorrect argument count. [#22174](https://github.com/pingcap/tidb/pull/22174)
+    - Show process info when building plan. [#22148](https://github.com/pingcap/tidb/pull/22148)
+    - Fix issue of runtime stats of index lookup reader doesn't accurate. [#22136](https://github.com/pingcap/tidb/pull/22136)
+    - Add a cache for memory info when the cluster is deployed in container. [#22116](https://github.com/pingcap/tidb/pull/22116)
+    - Fix issue of decode plan error cause by without escape special char. [#22022](https://github.com/pingcap/tidb/pull/22022)
+    - Report error for invalid window specifications which are not used in window functions. [#21976](https://github.com/pingcap/tidb/pull/21976)
+    - Throw error when prepared statement is execute, deallocate or prepare [#21972](https://github.com/pingcap/tidb/pull/21972)
+    - Fix `insert ignore` into not exists partition should not report error [#21971](https://github.com/pingcap/tidb/pull/21971)
+    - Unify the plan code for explain result and slow log. [#21964](https://github.com/pingcap/tidb/pull/21964)
+    - Fix unknown columns in join using below agg [#21957](https://github.com/pingcap/tidb/pull/21957)
+    - Fix wrong type inferring for ceiling function. [#21936](https://github.com/pingcap/tidb/pull/21936)
+    - Double type column from table should ignore its decimal [#21916](https://github.com/pingcap/tidb/pull/21916)
+    - Fix correlated aggregates which should be evaluated in outer query instead of in subqueries. [#21877](https://github.com/pingcap/tidb/pull/21877)
+    - Report error for json object with key length >= 65536. [#21870](https://github.com/pingcap/tidb/pull/21870)
+    - Fix compatibility issue with MySQL for function `dayname` [#21850](https://github.com/pingcap/tidb/pull/21850)
+    - When using input types longer than blob (such as a longblob or longtext), the function `to_base64` always returned `NULL`. It now returns the correct value. [#21813](https://github.com/pingcap/tidb/pull/21813)
+    - Fix the fail when we compare multi fields in the subquery [#21808](https://github.com/pingcap/tidb/pull/21808)
+    - Fix compare float64 with float64 in json [#21785](https://github.com/pingcap/tidb/pull/21785)
+    - Fix compare object json type [#21718](https://github.com/pingcap/tidb/pull/21718)
+    - Fix the coercibility of the cast function [#21714](https://github.com/pingcap/tidb/pull/21714)
+    - Fix unexpected panic when using IF function [#21711](https://github.com/pingcap/tidb/pull/21711)
+    - Fix #20161, json search result null is not compatible with mysql [#21700](https://github.com/pingcap/tidb/pull/21700)
+    - Check for only_full_group_by in ORDER BY and HAVING for query without group clause. [#21697](https://github.com/pingcap/tidb/pull/21697)
+    - Fix the compatibility of extract day_time unit functions [#21676](https://github.com/pingcap/tidb/pull/21676)
+    - Fix LEAD and LAG's default value can not adapt to field type [#21665](https://github.com/pingcap/tidb/pull/21665)
+    - TiDB now checks to make sure that the `LOAD DATA` statement can only load data into base tables. [#21638](https://github.com/pingcap/tidb/pull/21638)
+    - Handle invalid argument for addtime and subtime function [#21635](https://github.com/pingcap/tidb/pull/21635)
+    - Use “round to nearest even” rule instead of “round half away from zero” for approximate-value numbers [#21628](https://github.com/pingcap/tidb/pull/21628)
+    - The single-argument `WEEK()` call now recognize the global `@@default_week_format` even when the session one is not set explicitly. [#21623](https://github.com/pingcap/tidb/pull/21623)
+
++ TiKV
+
+    - Fix failed to build TiKV with PROST=1 [#9604](https://github.com/tikv/tikv/pull/9604)
+    - Fix unmatched memory information [#9589](https://github.com/tikv/tikv/pull/9589)
+    - Fix the issue that end key of a partial rawkv-restore range is inclusive [#9583](https://github.com/tikv/tikv/pull/9583)
+    - Fix the issue that when loading old value for CDC's incremental scan on a key where there's a rolled back transaction, in some cases TiKV may panic. [#9569](https://github.com/tikv/tikv/pull/9569)
+    - Fix old value config glitch when changefeeds with different settings connect to one region [#9565](https://github.com/tikv/tikv/pull/9565)
+    - Fix a crash problem when running a TiKV on a machine with a network interface lacking MAC address since v4.0.9. [#9516](https://github.com/tikv/tikv/pull/9516)
+    - Fix the problem that TiKV OOM when we backup a huge region. [#9448](https://github.com/tikv/tikv/pull/9448)
+    - Fix `region-split-check-diff` can not be customized [#9530](https://github.com/tikv/tikv/pull/9530)
+    - Fix TiKV panicked when system time go back [#9542](https://github.com/tikv/tikv/pull/9542)
+
++ PD
+
+    - Fix the issue that member health metrics not correct [#3368](https://github.com/pingcap/pd/pull/3368)
+    - If a tombstone store still has peers, make it cannot be removed. [#3352](https://github.com/pingcap/pd/pull/3352)
+
++ TiFlash
+
+    - Fix the bug that `min/max` result is wrong for decimal types
+    - Fix the bug that TiFlash may crash when reading data [#1358](https://github.com/pingcap/tics/pull/1358)
+    - Fix the issue that some data written after DDL operation may be lost after data compaction [#1350](https://github.com/pingcap/tics/pull/1350)
+
+## 请判断以下 note 是否为本次发版所需。如果是，请移动到以上分类中或指出其所属分类。如果不是，请删除相应的 note
+
++ TiDB
+
+    - Incorporate unicode_ci into constant propagation [#22614](https://github.com/pingcap/tidb/pull/22614)
+    - Fix an issue that cause wrong collation and coercibility [#22602](https://github.com/pingcap/tidb/pull/22602)
+    - Fix an issue that may get wrong collation result [#22599](https://github.com/pingcap/tidb/pull/22599)
+    - Refine `CollationStrictness` to support incompatible strictnessship [#22582](https://github.com/pingcap/tidb/pull/22582)
+    - Implement `utf8_unicode_ci` and `utf8mb4_unicode_ci` collation [#22558](https://github.com/pingcap/tidb/pull/22558)
+    - Metrics: grafana dashboards support multiple clusters [#22534](https://github.com/pingcap/tidb/pull/22534)
+    - Fix a bug that the `like` function returns the wrong result when using collation [#22531](https://github.com/pingcap/tidb/pull/22531)
+    - TiDB 4.0.9 fixed a security issue, where TiDB incorrectly permitted multiple statements to be executed in one `COM_QUERY` packet, leading to increased risk of SQL injection. To provide backwards compatibility for applications that depend on this behavior, a new option `tidb_multi_statement_mode` has been added. Assuming you understand the security risks, you can revert to the 4.0.8 by executing `SET GLOBAL tidb_multi_statement_mode='ON'`. The default behavior of `tidb_multi_statement_mode` also relaxes the error introduced in 4.0.9 to a warning. It is intended to be changed to an error again in a future release. [#22468](https://github.com/pingcap/tidb/pull/22468)
+    - Metrics slow query is divided into internal and general [#22405](https://github.com/pingcap/tidb/pull/22405)
+    - Add `utf8_unicode_ci` and `utf8mb4_unicode_ci` interface. [#22099](https://github.com/pingcap/tidb/pull/22099)
+    - Error message redact normalize. [#21889](https://github.com/pingcap/tidb/pull/21889) [#21891](https://github.com/pingcap/tidb/pull/21891) [#22669](https://github.com/pingcap/tidb/pull/22669)
+
++ PD
+
+    - Fix the issue that the store limit cannot be persisted [#3403](https://github.com/pingcap/pd/pull/3403)
+    - Fix the limit constriction of the scatter range scheduler [#3401](https://github.com/pingcap/pd/pull/3401)
+    - Metrics: grafana dashboards support multiple clusters [#3398](https://github.com/pingcap/pd/pull/3398)
+
++ Tools
+
+    - BR
+
+        * Fix the issue that in rawkv mode, the end key of restoring range may be included, which is expected to be exclusive. [#726](https://github.com/pingcap/br/pull/726)
+
+    - TiCDC
+
+        * Fix atomicity of transactions is broken in the downstream [#1375](https://github.com/pingcap/ticdc/pull/1375)
+        * Fix a bug that kv client may skip to recreate event feed receiving routine by accident. [#1373](https://github.com/pingcap/ticdc/pull/1373)
+        * Adjust default sort-dir and add warnings about choice of sort-dir [#1372](https://github.com/pingcap/ticdc/pull/1372)
+        * Check update safepoint error. [#1367](https://github.com/pingcap/ticdc/pull/1367)
+        * Fix potential data loss if a processor crashes when starting up a table. [#1363](https://github.com/pingcap/ticdc/pull/1363)
+        * Fix metric `ticdc_processor_num_of_tables` and `ticdc_processor_table_resolved_ts` are properly updated when processor removes a table or the processor itself stops. [#1351](https://github.com/pingcap/ticdc/pull/1351)
+        * Metrics: grafana dashboards support multiple clusters [#1350](https://github.com/pingcap/ticdc/pull/1350)
+        * Fix a bug that TiCDC server could hang when processing a new changefeed with invalid sort-engine parameter [#1326](https://github.com/pingcap/ticdc/pull/1326)
+        * Fix the output in changefeed out of order [#1323](https://github.com/pingcap/ticdc/pull/1323)

releases/release-notes.md

@@ -11,6 +11,7 @@ aliases: ['/docs/dev/releases/release-notes/','/docs/dev/releases/rn/']
 
 ## 4.0
 
+- [4.0.11](/releases/release-4.0.11.md)
 - [4.0.10](/releases/release-4.0.10.md)
 - [4.0.9](/releases/release-4.0.9.md)
 - [4.0.8](/releases/release-4.0.8.md)