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release note: add a check item for feedback-probability (#6887) #7024

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Aug 30, 2021
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release note: add a check item for feedback-probability (#6887) #7024

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ebd9c7f
add_info_for_feedback-probability
qiancai Aug 18, 2021
74d619d
Update release-5.0.0.md
qiancai Aug 18, 2021
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1 change: 1 addition & 0 deletions releases/release-5.0.0.md
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Expand Up @@ -63,6 +63,7 @@ TiDB 版本：5.0.0

### 其他

+ 升级前，请检查 TiDB 配置项 [`feedback-probability`](/tidb-configuration-file.md#feedback-probability) 的值。如果不为 0，升级后会触发 "panic in the recoverable goroutine" 报错，但不影响升级。
+ 为了避免造成数据正确性问题，列类型变更不再允许 `VARCHAR` 类型和 `CHAR` 类型的互相转换。

## 新功能
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1 change: 1 addition & 0 deletions releases/release-5.1.0.md
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Expand Up @@ -58,6 +58,7 @@ TiDB 版本：5.1

### 其他

- 升级前，请检查 TiDB 配置项 [`feedback-probability`](/tidb-configuration-file.md#feedback-probability) 的值。如果不为 0，升级后会触发 "panic in the recoverable goroutine" 报错，但不影响升级。
- 为了提升 TiDB 性能，TiDB 的 Go 编译器版本从 go1.13.7 升级到了 go1.16.4。如果你是 TiDB 的开发者，为了能保证顺利编译，请对应升级你的 Go 编译器版本。
- 请避免在对使用 TiDB Binlog 的集群进行滚动升级的过程中新创建聚簇索引表。
- 请避免在 TiDB 滚动升级时执行 `alter table ... modify column` 或 `alter table ... change column`。
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