Add info about compatibility issues with Connector/J 8.0 with TiDB v7.5 #15794
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Co-authored-by: Aolin <aolinz@outlook.com>
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Signed-off-by: Aolin <aolin.zhang@pingcap.com>
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| > There is a [bug](https://bugs.mysql.com/bug.php?id=106252) in the Connector/J 8.0 versions before 8.0.32, which might cause threads to hang when using TiDB versions earlier than v6.3.0. To avoid this issue, it is recommended that you use either MySQL Connector/J 8.0.32 or a later version, or the TiDB JDBC (see the *TiDB-JDBC* tab). | ||
| > - There is a [bug](https://bugs.mysql.com/bug.php?id=106252) in the Connector/J 8.0 versions before 8.0.32, which might cause threads to hang when using TiDB versions earlier than v6.3.0. To avoid this issue, it is recommended that you use either MySQL Connector/J 8.0.32 or a later version, or the TiDB JDBC (see the *TiDB-JDBC* tab). | ||
| > - When using MySQL Connector/J 8.0 with TiDB v7.5.0, it is recommended to set the TiDB configuration item [`server-version`](https://docs.pingcap.com/tidb/v7.5/tidb-configuration-file#server-version) to `"5.7.25-TiDB-v7.5.0"`. MySQL Connector/J attempts to access the `information_schema.KEYWORDS` table if the TiDB server reports a version of MySQL 8.0.11 or later. However, this table is not present in TiDB v7.5.0. | ||
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@dveeden, please help confirm whether pingcap/tidb#48807 will be cherry-picked to v7.5. If yes, the above change looks okay because the issue will be fixed for v7.5.1.
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It is currently not clear if this will be backported or not. I'm discussing this with various people.
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Got it. If it is not backported in v7.5.1, we'll also need to include v7.5.1 in this note when v7.5.1 is published.
Co-authored-by: Grace Cai <qqzczy@126.com>
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What is changed, added or deleted? (Required)
MySQL Connector/J 8.0 has compatibility issues with TiDB v7.5. Earlier versions of TiDB are fine as they announce themselves as MySQL v5.7. Later versions are fine as they implement the
information_schema.KEYWORDtable.Which TiDB version(s) do your changes apply to? (Required)
Tips for choosing the affected version(s):
By default, CHOOSE MASTER ONLY so your changes will be applied to the next TiDB major or minor releases. If your PR involves a product feature behavior change or a compatibility change, CHOOSE THE AFFECTED RELEASE BRANCH(ES) AND MASTER.
For details, see tips for choosing the affected versions.
What is the related PR or file link(s)?
Do your changes match any of the following descriptions?