releases: add tidb release notes 4.0.12 by TomShawn · Pull Request #5806 · pingcap/docs-cn

TomShawn · 2021-03-23T12:12:45Z

What is changed, added or deleted? (Required)

add tidb release notes 4.0.12

Which TiDB version(s) do your changes apply to? (Required)

What is the related PR or file link(s)?

This PR is translated from: update tidb v4.0.12 release notes docs#5090
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ti-chi-bot · 2021-03-23T12:12:46Z

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TomShawn · 2021-03-23T12:15:49Z

/translation from-docs
/label needs-cherry-pick-4.0
/label needs-cherry-pick-5.0
/status PTAL
/cc @qw4990 @NingLin-P @nolouch @solotzg @overvenus

TomShawn · 2021-03-24T03:27:11Z

/hold

ti-srebot · 2021-03-25T12:17:16Z

@overvenus, @nolouch, @qw4990, @solotzg, @NingLin-P, PTAL.

qw4990 · 2021-03-26T09:11:50Z

+## 新功能
+
+## 改进提升
+


Suggested change

+ TiDB

- 优化 explain 中 batch cop 的信息展示 [#23164](https://github.com/pingcap/tidb/pull/23164)

- 为在 explain 语句中不能下推的表达式增加 warning 信息 [#23020](https://github.com/pingcap/tidb/pull/23020)

- 调整 DDL 包中部分 Execute/ExecRestricted 使用为 ExecuteInternal (2) [#22935](https://github.com/pingcap/tidb/pull/22935)

- 调整 DDL 包中部分 Execute/ExecRestricted 使用为 ExecuteInternal (1) [#22929](https://github.com/pingcap/tidb/pull/22929)

- 添加 optimization-time 和 wait-TS-time 到慢日志中 [#22918](https://github.com/pingcap/tidb/pull/22918)

- 支持从 infoschema.partitions 表中查询 partition_id [#22489](https://github.com/pingcap/tidb/pull/22489)

- 支持 'last_plan_from_binding' 以帮助知道 SQL 计划是否来自于 binding [#21430](https://github.com/pingcap/tidb/pull/21430)

- 支持在没有 pre-split 选项时也能执行 truncate 表操作 Scattering truncated tables without pre-split option. [#22872](https://github.com/pingcap/tidb/pull/22872)

- 为 str_to_date 支持三种新的符号 [#22812](https://github.com/pingcap/tidb/pull/22812)

- 在 metircs 监控中记录 prepare 执行内存 OOM 问题失败 [#22672](https://github.com/pingcap/tidb/pull/22672)

- 当 tidb_snapshot 被设置时 prepare 语句执行不进行错误报告 [#22641](https://github.com/pingcap/tidb/pull/22641)

qw4990 · 2021-03-26T09:12:20Z

+
+## 改进提升
+
+## Bug 修复


Suggested change

## Bug 修复

## Bug 修复

+ TiDB

- 修复当变量为 16 进制字面量时 get 表达式出错问题 [#23372](https://github.com/pingcap/tidb/pull/23372)

- 修复生成 enum 和 set 类型的�快速执行计划时使用了错误 collation 的问题 [#23292](https://github.com/pingcap/tidb/pull/23292)

- 修复 nullif 和 is-null 表达式使用时可能出现结果错误的问题 [#23279](https://github.com/pingcap/tidb/pull/23279)

- 修复自动搜集统计信息在规定时间窗口外被触发的问题 [#23219](https://github.com/pingcap/tidb/pull/23219)

- 修复 point-get 计划中 cast 函数可能忽略错误的问题 [#23211](https://github.com/pingcap/tidb/pull/23211)

- 修复 CurrentDB 为空时 SPM 可能不生效的问题 [#23209](https://github.com/pingcap/tidb/pull/23209)

- 修复 IndexMerge 执行计划中可能出现错误过滤条件的问题 [#23165](https://github.com/pingcap/tidb/pull/23165)

- 修复 null 常量的返回类型中可能出现 NotNullFlag 的问题 [#23135](https://github.com/pingcap/tidb/pull/23135)

- 修复 text 类型可能遗漏处理 collation 的问题 [#23092](https://github.com/pingcap/tidb/pull/23092)

- 修复 range 分区表处理 IN 表达式可能出错的问题 [#23074](https://github.com/pingcap/tidb/pull/23074)

- 修复将 TiKV 标记为 Tombstone 后在相同地址和端口启动不同 StoreID 的新 TiKV 持续返回 StoreNotMatch 的问题 [#23071](https://github.com/pingcap/tidb/pull/23071)

- int 类型为 null 且和 year 进行比较时不进行类型调整 [#22844](https://github.com/pingcap/tidb/pull/22844)

- 修复当表含有 auto_random 列 load data 时失去连接的问题 [#22736](https://github.com/pingcap/tidb/pull/22736)

- 修复取消 DDL 操作 panic 时可能阻塞其他 DDL 操作的问题 [#23297](https://github.com/pingcap/tidb/pull/23297)

- 修复进行 null 和 year 比较时可能生成错误 key range 的问题 [#23104](https://github.com/pingcap/tidb/pull/23104)

- 修复创建 view 成功但是使用时可能失败的问题 [#23083](https://github.com/pingcap/tidb/pull/23083)

solotzg · 2021-03-29T05:15:41Z

+TiDB 版本：4.0.12
+
+## 新功能
+


Suggested change

+ TiFlash

- 新增工具用于检测当前 `tiflash replica` 的实际状态

solotzg · 2021-03-29T05:29:29Z

+    - 为 str_to_date 支持三种新的符号 [#22812](https://github.com/pingcap/tidb/pull/22812)
+    - 在 metircs 监控中记录 prepare 执行内存 OOM 问题失败 [#22672](https://github.com/pingcap/tidb/pull/22672)
+    - 当 tidb_snapshot 被设置时 prepare 语句执行不进行错误报告 [#22641](https://github.com/pingcap/tidb/pull/22641)
+


Suggested change

+ TiFlash

- 优化配置文件并删除无用项

- 减小 TiFlash 二进制文件大小

- 使用自适应的 GC 策略以减少内存使用

solotzg · 2021-03-29T05:43:11Z

+    - 当 tidb_snapshot 被设置时 prepare 语句执行不进行错误报告 [#22641](https://github.com/pingcap/tidb/pull/22641)
+
+## Bug 修复
+


Suggested change

+ TiFlash

- 修复当 `binary` 列的默认值包含前后 `\0` 字节时查询结果错误的问题

- 修复当数据库名称中包含特殊字符时无法同步数据的问题

- 修复 `IN` 表达式中出现 `Decimal` 列时查询结果错误的问题

- 修复 Grafana 中已打开文件数指标过高的问题

- 修复当表达式中包含 `Timestamp` 类型时查询结果错误的问题

- 修复处理 `FROM_UNIXTIME` 表达式时可能发生崩溃的问题

- 修复字符串转换为整数结果不正确的问题

- 修复 `like` 表达式可能返回错误结果的问题

tier-cap

TiKV变更点

tier-cap · 2021-03-29T08:20:30Z

+    - 为 str_to_date 支持三种新的符号 [#22812](https://github.com/pingcap/tidb/pull/22812)
+    - 在 metircs 监控中记录 prepare 执行内存 OOM 问题失败 [#22672](https://github.com/pingcap/tidb/pull/22672)
+    - 当 tidb_snapshot 被设置时 prepare 语句执行不进行错误报告 [#22641](https://github.com/pingcap/tidb/pull/22641)
+


TiKV

Pd_client:：禁止短时间内大量重连现象 #9879

对于多tombstones场景下的写操作进行优化 #9729

将leader-transfer-max-log-lag默认值改为128，以增加切主的成功率 #9605

tier-cap · 2021-03-29T08:26:34Z

+    - 当 tidb_snapshot 被设置时 prepare 语句执行不进行错误报告 [#22641](https://github.com/pingcap/tidb/pull/22641)
+
+## Bug 修复
+


TiKV

解决IN表达式没有正确处理有符号、无符号整型数的问题 #9850

解决ingest操作不可重入问题 #9779

解决TiKV在处理Json向String转换时空格缺失的问题 #9666

overvenus · 2021-03-29T15:16:08Z

+    - 修复当表含有 auto_random 列 load data 时失去连接的问题 [#22736](https://github.com/pingcap/tidb/pull/22736)
+    - 修复取消 DDL 操作 panic 时可能阻塞其他 DDL 操作的问题 [#23297](https://github.com/pingcap/tidb/pull/23297)
+    - 修复进行 null 和 year 比较时可能生成错误 key range 的问题 [#23104](https://github.com/pingcap/tidb/pull/23104)
+    - 修复创建 view 成功但是使用时可能失败的问题 [#23083](https://github.com/pingcap/tidb/pull/23083)


Suggested change

- 修复创建 view 成功但是使用时可能失败的问题 [#23083](https://github.com/pingcap/tidb/pull/23083)

- 修复创建 view 成功但是使用时可能失败的问题 [#23083](https://github.com/pingcap/tidb/pull/23083)

# TiCDC

## Improvements

* 在启动暂停同步时间超过 1 天的任务时需要二次确认 [#1497](https://github.com/pingcap/ticdc/pull/1497)

## Bug Fixes

* 解决 resolved ts 时间乱序的问题 [#1464](https://github.com/pingcap/ticdc/pull/1464)

* 解决由于网络不稳定而导致的表调度出错引发的数据丢失问题 [#1508](https://github.com/pingcap/ticdc/pull/1508)

# TiDB-binlog

None

# BR

## Improvements

* 记录 `HTTP_PROXY` 和 `HTTPS_PROXY` 环境变量 [#827](https://github.com/pingcap/br/pull/827)

* 提升多表场景下的备份性能 [#745](https://github.com/pingcap/br/pull/745)

* 在 service safe point 检查失败时汇报错误 [#826](https://github.com/pingcap/br/pull/826)

* 在 backupmeta 中记录集群版本和 BR 版本 [#803](https://github.com/pingcap/br/pull/803)

* 重试外部存储错误以便提高备份成功率 [#851](https://github.com/pingcap/br/pull/851)

* 减少 BR 备份的内存使用 [#886](https://github.com/pingcap/br/pull/886)

## Bug Fixes

* 解决 WalkDir 在 target 为 bucket name 的时候无返回值的问题 [#773](https://github.com/pingcap/br/pull/773)

* 解决 status 端口无 TLS 的问题 [#839](https://github.com/pingcap/br/pull/839)

# Dumpling

None

# TiDB-Lightning

## Improvements

* 检查 TiDB 版本以防止未知错误 [#787](https://github.com/pingcap/br/pull/787)

* 在遇到 cancel 错误时及时退出 [#867](https://github.com/pingcap/br/pull/867)

* 添加 `tikv-importer.engine-mem-cache-size` 和 `tikv-importer.local-writer-mem-cache-size` 参数以便调整内存占用和性能之间平衡. [#866](https://github.com/pingcap/br/pull/866)

* Local backend 并发运行 batch split region 已提高导入速度 [#868](https://github.com/pingcap/br/pull/868)

* 从 S3 导入数据时，Lightning 不在要求 s3:ListBucket 权限 [#919](https://github.com/pingcap/br/pull/919)

* 从 checkpoint 恢复时, Lightning 会继续使用之前的导入引擎 [#924](https://github.com/pingcap/br/pull/924)

## Bug Fixes

* 解决 importer 可能忽略文件已存在的错误 [#848](https://github.com/pingcap/br/pull/848)

* 解决 Lightning 可能使用错误的时间戳而读到错误数据的问题 [#850](https://github.com/pingcap/br/pull/850)

* 解决 Lightning 非预期退出时可能造成 checkpoint 损坏的问题 [#889](https://github.com/pingcap/br/pull/889)

* 解决由于忽略 cancel 错误而可能导致的数据错误的问题 [#874](https://github.com/pingcap/br/pull/874)

Co-authored-by: Grace Cai <qqzczy@126.com>

tier-cap

ok。

ti-chi-bot · 2021-04-01T11:21:10Z

@tier-cap: /lgtm is only allowed for the reviewers in list.

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ok。

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the ti-community-infra/tichi repository.

ti-chi-bot · 2021-04-02T03:18:19Z

@qw4990: /lgtm is only allowed for the reviewers in list.

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In response to this:

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the ti-community-infra/tichi repository.

Co-authored-by: Yilin Chen <sticnarf@gmail.com>

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

ti-srebot · 2021-04-02T08:52:57Z

cherry pick to release-4.0 in PR #5938

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

ti-srebot · 2021-04-02T08:53:58Z

cherry pick to release-5.0 in PR #5939

solotzg · 2021-04-02T09:00:28Z

LGTM

releases: add tidb release notes 4.0.12

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ti-chi-bot added missing-translation-status This PR does not have translation status info. size/S Denotes a PR that changes 10-29 lines, ignoring generated files. labels Mar 23, 2021

ti-chi-bot requested review from NingLin-P, nolouch, overvenus, qw4990 and solotzg March 23, 2021 12:15

ti-chi-bot added translation/from-docs This PR is translated from a PR in pingcap/docs. status/PTAL This PR is ready for reviewing. needs-cherry-pick-4.0 and removed missing-translation-status This PR does not have translation status info. labels Mar 23, 2021

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qw4990 reviewed Mar 26, 2021

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add tidb notes

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TomShawn added 2 commits March 30, 2021 15:52

Merge remote-tracking branch 'upstream/master' into 4.0.12-rn

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add tools, tikv, tiflash

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