ticdc: minor adjust the description of foreign_key_checks (#21068)
#21069
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Co-authored-by: Lilian Lee <lilin@pingcap.com>
Co-authored-by: Lilian Lee <lilin@pingcap.com>
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Hello @ti-chi-bot, I'm Gemini Code Assist1! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!
Summary of Changes
Hello! Gemini here, providing a summary of this pull request. This PR, which appears to be an automated cherry-pick, aims to make minor adjustments to the documentation regarding how TiCDC handles foreign_key_checks. The changes clarify the behavior of TiCDC when replicating data to a downstream where foreign key checks might be enabled, and also refine the description of general limitations regarding constraint validation.
Highlights
- Documentation Update: Foreign Key Checks: The documentation for TiCDC's data replication capabilities has been updated to provide more precise information about how foreign key constraints are handled. It now explicitly states that TiCDC automatically sets
SET SESSION foreign_key_checks = OFF;when writing data downstream, ensuring that data written by TiCDC does not trigger foreign key constraint validation, even if global checks are enabled. - Documentation Update: Limitations Example: The 'Limitations' section has been slightly reworded, removing a specific mention of foreign key validation here (as it's covered in the capabilities section) and adding a new example illustrating a limitation related to schema mismatches when DDL events are filtered out.
Changelog
- ticdc/ticdc-data-replication-capabilities.md
- Updated the description of foreign key constraint DDL handling (line 36) to clarify that TiCDC uses
SET SESSION foreign_key_checks = OFF;when writing data downstream. - Modified the sentence describing general validation limitations (line 47) and added a new example (lines 48-49) about replication failure due to schema mismatches when DDLs are filtered.
- Updated the description of foreign key constraint DDL handling (line 36) to clarify that TiCDC uses
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Code Review
The pull request makes minor but valuable adjustments to the documentation regarding TiCDC's handling of foreign key constraints and limitations. The changes improve the clarity and technical accuracy of the ticdc-data-replication-capabilities.md file.
Summary of Findings
- Improved clarity on foreign key handling: The documentation now provides a clearer explanation of how TiCDC handles foreign key constraints by enabling
SET SESSION foreign_key_checks = OFF;. - More relevant example for limitations: The example in the Limitations section has been updated to better illustrate potential replication failures due to schema mismatches when DDLs are filtered.
- Minor phrasing suggestion: A minor suggestion for rephrasing a sentence to improve flow, though the current version is acceptable.
Merge Readiness
The code changes are documentation improvements that enhance clarity and accuracy. The suggestions provided are minor and can be addressed at the author's discretion. The pull request is in good shape to be merged. Please note that I am unable to approve the pull request directly, and other reviewers should provide approval before merging.
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/approve |
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[APPROVALNOTIFIER] This PR is APPROVED This pull-request has been approved by: lilin90 The full list of commands accepted by this bot can be found here. The pull request process is described here
Needs approval from an approver in each of these files:
Approvers can indicate their approval by writing |
This is an automated cherry-pick of #21068
First-time contributors' checklist
What is changed, added or deleted? (Required)
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)?
foreign_key_checksdocs-cn#20422Do your changes match any of the following descriptions?