tidb: mark tidb_mpp_store_fail_ttl as deprecated
#21410
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Signed-off-by: gengliqi <gengliqiii@gmail.com>
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Summary of Changes
Hello @gengliqi, 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 updates the documentation for the tidb_mpp_store_fail_ttl system variable, reflecting its deprecation and a change in its default behavior. This change signifies an improvement in how TiDB handles newly started TiFlash nodes, removing the necessity for a waiting period to prevent query failures.
Highlights
- Documentation Update: The
tidb_mpp_store_fail_ttlsystem variable is now officially marked as deprecated in the documentation. - Variable Behavior Change: Starting from TiDB v9.0.0, the default value of
tidb_mpp_store_fail_ttlwill be fixed to0s, meaning no delay is imposed for newly started TiFlash nodes. - Rationale for Change: The deprecation and change in default value are due to improvements that eliminate the need for an additional delay to prevent query failures when new TiFlash nodes come online.
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system-variables.md
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| - Default value: `60s` | ||
| - The newly started TiFlash node does not provide services. To prevent queries from failing, TiDB limits the tidb-server sending queries to the newly started TiFlash node. This variable indicates the time range in which the newly started TiFlash node is not sent requests. | ||
| - Default value: Before v9.0.0, the default value is `60s`. Starting from v9.0.0, the default value is `0s`. | ||
| - The newly started TiFlash node does not provide services. To prevent queries from failing, TiDB limits the tidb-server from sending queries to the newly started TiFlash nodes. This variable indicates the time range during which the newly started TiFlash node does not send requests. |
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The current description is a bit confusing and contains a factual error. The phrase the newly started TiFlash node does not send requests is incorrect; the node receives requests. The original passive voice is not sent requests was more accurate, but we can improve clarity with active voice.12
Here's a clearer and more concise version that explains the variable's purpose.
Style Guide References
| - The newly started TiFlash node does not provide services. To prevent queries from failing, TiDB limits the tidb-server from sending queries to the newly started TiFlash nodes. This variable indicates the time range during which the newly started TiFlash node does not send requests. | |
| - To prevent query failures when a TiFlash node starts, TiDB avoids sending queries to it for a period of time. This variable controls that time period. |
Footnotes
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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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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)?
tidb_mpp_store_fail_ttlas deprecated docs-cn#20668Do your changes match any of the following descriptions?