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releases: add tidb 4.0.15 release notes #7129

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Sep 27, 2021
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releases: add tidb 4.0.15 release notes #7129

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releases: add tidb 4.0.15 release notes
TomShawn Sep 15, 2021
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Update release-4.0.15.md
IANTHEREAL Sep 15, 2021
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add notes according to comments
TomShawn Sep 22, 2021
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TomShawn Sep 22, 2021
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TomShawn Sep 23, 2021
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Update release-4.0.15.md
qiancai Sep 24, 2021
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more pr to issue
TomShawn Sep 24, 2021
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Update releases/release-4.0.15.md
TomShawn Sep 24, 2021
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fix
TomShawn Sep 26, 2021
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Update releases/release-4.0.15.md
TomShawn Sep 26, 2021
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add compatibility changes
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@TomShawn
TomShawn committed Sep 22, 2021
commit 4b85803bdc75da51c2348feec4736a33727fe583
23 changes: 14 additions & 9 deletions releases/release-4.0.15.md
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Expand Up @@ -12,31 +12,36 @@ TiDB 版本：4.0.15

+ TiDB

- 回滚 [#21045](https://github.com/pingcap/tidb/pull/21045) 以避免第一次跑 show variables 很慢的问题。[#24326](https://github.com/pingcap/tidb/issues/24326).[26240]
- 修复在新会话中执行 `SHOW VARIABLES` 速度较慢的问题。该修复回退了 [#21045](https://github.com/pingcap/tidb/pull/21045) 中的部分更改，可能会引起兼容性问题。[#24326](https://github.com/pingcap/tidb/issues/24326)

## 功能增强

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+ TiKV

- 支持动态修改 TiCDC 配置 [#10645](https://github.com/tikv/tikv/issues/10645)

## 提升改进

+ TiDB

- Trigger auto-analyze based on histogram row count [#26706](https://github.com/pingcap/tidb/pull/26706)
- 基于直方图的 row count 来触发 auto-analyze [#26706](https://github.com/pingcap/tidb/pull/26706)

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+ TiKV

- 读写分离减少读取延迟 [#10619](https://github.com/tikv/tikv/pull/10619)
- TiKV 协处理器慢日志只会考虑处理请求所花费的时间 [#10863](https://github.com/tikv/tikv/pull/10863)
- 当 slogger 线程过载且队列已满时，删除日志而不是阻塞线程。 [#10863](https://github.com/tikv/tikv/pull/10863)
- 支持动态更改 CDC 配置。 [#10684](https://github.com/tikv/tikv/pull/10684)
- 减少已解析的 ts 消息大小以节省网络带宽。[#10677](https://github.com/tikv/tikv/pull/10677)
- 分离处理读写的 ready 状态以减少读延迟 [#10475](https://github.com/tikv/tikv/issues/10475)
- TiKV Coprocessor 慢日志只考虑处理请求所花费的时间 [#10841](https://github.com/tikv/tikv/issues/10841)
- 当 slogger 线程过载且队列已满时，删除日志而不是阻塞线程 [#10841](https://github.com/tikv/tikv/issues/10841)
- 减少 Resolved TS 消息的大小以节省网络带宽 [#2448](https://github.com/pingcap/ticdc/issues/2448)

+ PD

- 提升 PD 之间同步 Region 信息的性能 [#3932](https://github.com/tikv/pd/pull/3932)
- 提升了 PD 之间同步 Region 信息的性能 [#3932](https://github.com/tikv/pd/pull/3932)

+ Tools

+ Backup & Restore (BR)

- 并发执行 split 和 scatter regions 操作，在我们的性能测试中恢复速度从2小时提高到30分钟 [#1429](https://github.com/pingcap/br/pull/1429)
- 并发执行分裂和打散 Region 的操作，提升恢复速度 [#1429](https://github.com/pingcap/br/pull/1429)
- 遇到 PD 请求错误或 TiKV IO 超时错误时进行重试 [#1433](https://github.com/pingcap/br/pull/1433)
- 进行大量小表时减少空 region 的产生，避免影响恢复后的集群运行 [#1374](https://github.com/pingcap/br/issues/1374) [#1432](https://github.com/pingcap/br/pull/1432)
- 创建表的时候自动执行 `Rebase auto id` 操作，，省去了单独执行 `Rebase auto id` DDL，加快恢复速度 [#1424](https://github.com/pingcap/br/pull/1424)
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