br: introduce global variable tidb_advancer_check_point_lag_limit to control log backup checkpoint lag limitation
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Signed-off-by: Jianjun Liao <[email protected]>
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Summary of Changes
Hello @Leavrth, 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 TiDB documentation by adding a new entry for the tidb_advancer_check_point_lag_limit global system variable. This variable provides a mechanism to control and manage the checkpoint lag of log backup tasks, enhancing the reliability of backup operations by automatically pausing tasks that exceed a configurable lag threshold.
Highlights
- New System Variable Documentation: I've added comprehensive documentation for a new global system variable,
tidb_advancer_check_point_lag_limit, which is introduced in TiDB v9.1.0. - Log Backup Checkpoint Control: This new variable allows users to configure the maximum acceptable lag time for log backup task checkpoints. If a log backup task's checkpoint lag exceeds this defined limit (defaulting to 48 hours), the TiDB Advancer will automatically pause the task to prevent excessive lag and ensure system stability.
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Code Review
This pull request adds documentation for the new global variable tidb_advancer_check_point_lag_limit. The changes are straightforward. I've suggested a minor wording improvement to the variable's description for better clarity and to adhere to the style guide's preference for active voice.
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What is the related PR or file link(s)?
tidb_advancer_check_point_lag_limitto control log backup checkpoint lag limitation docs-cn#20710Do your changes match any of the following descriptions?