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release note: add a check item for feedback-probability #6405

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Sep 10, 2021
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release note: add a check item for feedback-probability #6405

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1 change: 1 addition & 0 deletions releases/release-5.0.0.md
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Expand Up @@ -68,6 +68,7 @@ In v5.0, the key new features or improvements are as follows:

### Others

+ Before the upgrade, check the value of the TiDB configuration [`feedback-probability`](/tidb-configuration-file.md#feedback-probability). If the value is not 0, the "panic in the recoverable goroutine" error will occur after the upgrade, but this error does not affect the upgrade.
+ Forbid conversion between `VARCHAR` type and `CHAR` type during the column type change to avoid data correctness issues.

## New features
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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 @@ In v5.1, the key new features or improvements are as follows:

### Others

- Before the upgrade, check the value of the TiDB configuration [`feedback-probability`](/tidb-configuration-file.md#feedback-probability). If the value is not 0, the "panic in the recoverable goroutine" error will occur after the upgrade, but this error does not affect the upgrade.
- Upgrade the Go compiler version of TiDB from go1.13.7 to go1.16.4, which improves the TiDB performance. If you are a TiDB developer, upgrade your Go compiler version to ensure a smooth compilation.
- Avoid creating tables with clustered indexes in the cluster that uses TiDB Binlog during the TiDB rolling upgrade.
- Avoid executing statements like `alter table ... modify column` or `alter table ... change column` during the TiDB rolling upgrade.
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