Add more description about SHARD_ROW_ID_BITS (#21467) #21600
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Co-authored-by: Aolin <[email protected]>
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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 enhances the documentation for the SHARD_ROW_ID_BITS configuration by providing a more comprehensive explanation. The update clarifies the internal structure of _tidb_rowid when this setting is applied, detailing how shard bits and auto-increment bits are used. It also offers crucial best practices for configuring SHARD_ROW_ID_BITS to effectively mitigate hotspot issues and optimize performance in a TiDB cluster.
Highlights
- Enhanced
SHARD_ROW_ID_BITSDocumentation: Added a detailed explanation of the_tidb_rowidstructure whenSHARD_ROW_ID_BITSis set, including the breakdown into sign, shard, and auto-increment bits. - Auto-increment Bit Behavior: Clarified how auto-increment bits are stored and allocated, and the implications of their exhaustion, such as the
Failed to read auto-increment value from storage engineerror. - Best Practices for Shard Bit Selection: Included guidance on balancing shard bits and auto-increment bits, and recommended setting shard bits based on the number of TiKV nodes for optimal load distribution and resource utilization.
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Code Review
This pull request adds a helpful and detailed description of SHARD_ROW_ID_BITS. My review focuses on improving clarity and ensuring adherence to the documentation style guide. I've provided a consolidated suggestion to address minor formatting and phrasing issues for better readability.
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/approve |
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[APPROVALNOTIFIER] This PR is APPROVED This pull-request has been approved by: qiancai The full list of commands accepted by this bot can be found here. The pull request process is described here
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…auto-embed * commit 'b570cc86270ba2e2b2b71d6eab8d717c2c8a1c56': (48 commits) *: remove TiDB roadmap from TOC, home, index, add warning (#21628) (#21637) Update the scope of system-variable ”tidb_redact_log“ (#21513) (#21634) *: add custom Japanese localization for cloud docs (#21612) Modify the introduction of `cop_pool_size` (#21462) (#21627) tiflash: Update tiflash upgrade guide (#21619) (#21625) Update tidb-performance-tuning-config.md (#21621) (#21624) Update tidb-cloud-poc.md (#21336) (#21411) cloud: update the pricing link for starter (#21620) ticdc: clarify descriptions of `index-value` and `columns` (#21616) (#21617) release-8.5: remove 'v' prefix from tidb-version variable (#21614) release-8.5: update version to 8.5.3 (#21613) cloud: fix note annotation syntax for proper rendering (#21611) ticdc: add key word for redo log (#21564) (#21607) ticdc: correct the tiup cluster command (#21135) (#21608) bump TiDB from v8.5.2 to v8.5.3 (#21578) v8.5.3: add release notes (#21399) (#21606) v8.5.3: log backup: update metafile format (#21412) (#21577) v8.5.3: update telemetry related doc files (#21404) (#21603) system-variables: add optimizer cost factors (#20748) (#21602) Add more description about SHARD_ROW_ID_BITS (#21467) (#21600) ...
This is an automated cherry-pick of #21467
What is changed, added or deleted? (Required)
Add notice about setting the value of SHARD_ROW_ID_BITS
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 (in Chinese).
What is the related PR or file link(s)?
Do your changes match any of the following descriptions?