docs: clarify AUTO_RANDOM_BASE usage and explicit insert behavior (#20734) #20946
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Mention conflicts happen in deployments with multiple TiDB nodes.
Adjustments based on the review by @tangenta
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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
This pull request addresses issue #20732 by clarifying the usage of AUTO_RANDOM_BASE and the behavior of explicit inserts in the auto-random.md documentation file. The changes aim to reduce confusion regarding clearing the auto-increment ID cache, especially in multi-TiDB instance deployments. The PR clarifies that ALTER TABLE ... AUTO_RANDOM_BASE without FORCE doesn't change the value, emphasizes the necessity of FORCE for modification, and explains potential collisions with explicit inserts. The documentation is also improved for readability.
Highlights
- AUTO_RANDOM_BASE Clarification: Clarifies that
ALTER TABLE ... AUTO_RANDOM_BASEwithout theFORCEkeyword does not actually change the value, despite the warning message. - FORCE Keyword Requirement: Emphasizes that the
FORCEkeyword is mandatory to modifyAUTO_RANDOM_BASEand that setting it to0even withFORCEwill result in an error. A non-zero positive integer must be used withFORCE. - Explicit Insert Collisions: Improves the explanation of how explicit inserts can potentially collide with the internal auto-incrementing part of
AUTO_RANDOMIDs, potentially leading to duplicate key errors. - Readability Improvements: Splits a longer paragraph into smaller ones for better readability.
Changelog
- auto-random.md
- Clarifies the behavior of
ALTER TABLE ... AUTO_RANDOM_BASEwith and without theFORCEkeyword. - Explains the potential for ID collisions when using explicit inserts with
AUTO_RANDOMcolumns in multi-TiDB instance deployments. - Provides two options for clearing unallocated cached IDs: automatic rebase and manual base value setting.
- Adds notes regarding the restrictions and requirements for using the
FORCEkeyword. - Improves the overall readability of the section by splitting a long paragraph.
- Clarifies the behavior of
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Code Review
The pull request enhances the documentation for AUTO_RANDOM_BASE usage, addressing a specific user concern. The changes improve clarity and provide more detailed explanations. Overall, the changes are well-structured and contribute positively to the documentation. However, I have a few suggestions to further enhance the content, focusing on clarity and adherence to the style guide.
Summary of Findings
- Clarity and Readability: The documentation effectively clarifies the usage of
AUTO_RANDOM_BASEand the behavior of explicit inserts. However, some paragraphs could be broken down further for improved readability. - Style Guide Adherence: The documentation generally adheres to the style guide, but there are a few instances where sentence case for headings and the use of backticks for code elements could be improved.
Merge Readiness
The pull request is almost ready for merging. Addressing the minor suggestions related to clarity and style guide adherence would further enhance the quality of the documentation. I am unable to approve this pull request, and recommend that others review and approve this code before merging.
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/approve |
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[APPROVALNOTIFIER] This PR is APPROVED This pull-request has been approved by: hfxsd The full list of commands accepted by this bot can be found here. The pull request process is described here
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Approvers can indicate their approval by writing |
This is an automated cherry-pick of #20734
First-time contributors' checklist
What is changed, added or deleted? (Required)
Close issue: #20732
This PR updates the "Clear the auto-increment ID cache" section in
auto-random.mdto address confusion reported in the issue above. Specifically, the changes:ALTER TABLE ... AUTO_RANDOM_BASEwithout theFORCEkeyword does not actually change the value, despite the warning message.FORCEkeyword is mandatory to modifyAUTO_RANDOM_BASE.AUTO_RANDOM_BASEto0, even withFORCE, will result in an error.FORCE.AUTO_RANDOMIDs, potentially leading to duplicate key errors.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)?
auto-random.mdDo your changes match any of the following descriptions?