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This is an automated cherry-pick of #22245

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@ti-chi-bot ti-chi-bot added area/tidb-cloud This PR relates to the area of TiDB Cloud. contribution This PR is from a community contributor. lgtm ok-to-test Indicates a PR is ready to be tested. size/L Denotes a PR that changes 100-499 lines, ignoring generated files. type/cherry-pick-for-release-8.5 This PR is cherry-picked to release-8.5 from a source PR. labels Jan 29, 2026
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Summary of Changes

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!

This pull request introduces comprehensive documentation for the new TiDB X architecture, a significant evolution towards a cloud-native, shared-storage distributed SQL database. The changes aim to clearly define and differentiate TiDB X from the classic TiDB architecture, highlighting its benefits in terms of elastic scalability, predictable performance through workload isolation, and optimized total cost of ownership.

Highlights

  • New TiDB X Architecture Documentation: A new document tidb-cloud/tidb-x-architecture.md has been added, providing a detailed introduction to the TiDB X architecture, its motivations, overview, and key innovations.
  • Architecture Naming Convention Update: The existing "TiDB Cluster Architecture" has been renamed to "TiDB Classic Architecture" in the table of contents and within the tidb-architecture.md file to differentiate it from the new TiDB X architecture.
  • Enhanced Scalability and Performance Isolation: The TiDB X architecture introduces a shared-storage model, separates compute workloads into lightweight (OLTP) and heavy (background tasks) pools, and transitions from a single LSM tree to an LSM forest, leading to 5x-10x faster scaling and improved performance predictability.
  • Cost Optimization with Elastic TCO: TiDB X adopts an elastic, pay-as-you-go cost model, allowing resources to scale automatically based on demand and reducing the need for over-provisioning.

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Code Review

This pull request introduces a new documentation page for the TiDB X architecture, a significant evolution of TiDB's design. The changes also include updating the table of contents and the existing architecture page to differentiate between the 'classic' and 'X' architectures. The new document is comprehensive and well-structured. I've provided a few minor suggestions to improve grammar, clarity, and consistency with the style guide, such as using simpler words (e.g., 'uses' instead of 'utilizes'), correcting adverb usage, and ensuring consistent terminology for 'LSM tree'.

@lilin90 lilin90 self-assigned this Jan 29, 2026
lilin90 and others added 3 commits January 29, 2026 18:31
Co-authored-by: gemini-code-assist[bot] <176961590+gemini-code-assist[bot]@users.noreply.github.com>
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lilin90 commented Jan 29, 2026

/approve

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ti-chi-bot bot commented Jan 29, 2026

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: lilin90

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@ti-chi-bot ti-chi-bot bot added the approved label Jan 29, 2026
@ti-chi-bot ti-chi-bot bot merged commit 7fb5db5 into pingcap:release-8.5 Jan 29, 2026
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@ti-chi-bot ti-chi-bot bot deleted the cherry-pick-22245-to-release-8.5 branch January 29, 2026 10:56
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approved area/tidb-cloud This PR relates to the area of TiDB Cloud. contribution This PR is from a community contributor. lgtm ok-to-test Indicates a PR is ready to be tested. size/L Denotes a PR that changes 100-499 lines, ignoring generated files. type/cherry-pick-for-release-8.5 This PR is cherry-picked to release-8.5 from a source PR.

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3 participants