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Add circuit breaker variable #20129

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Add circuit breaker variable #20129

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bf8ec48
add circuit breaker variable
rleungx Jan 23, 2025
c276d98
Apply suggestions from code review
hfxsd Jan 23, 2025
224b5d5
Update system-variables.md
hfxsd Jan 23, 2025
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9 changes: 9 additions & 0 deletions system-variables.md
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Expand Up @@ -1389,6 +1389,15 @@ mysql> SELECT job_info FROM mysql.analyze_jobs ORDER BY end_time DESC LIMIT 1;
- This variable is used to control whether to enable the [baseline capturing](/sql-plan-management.md#baseline-capturing) feature. This feature depends on the statement summary, so you need to enable the statement summary before you use baseline capturing.
- After this feature is enabled, the historical SQL statements in the statement summary are traversed periodically, and bindings are automatically created for SQL statements that appear at least twice.

### tidb_cb_pd_metadata_error_rate_threshold_pct <span class="version-mark">New in v9.0.0</span>

- Scope: GLOBAL
- Persists to cluster: Yes
- Applies to hint [SET_VAR](/optimizer-hints.md#set_varvar_namevar_value): No
- Default value: `0`
- Range: `[0, 100]`
- This variable controls whether TiDB triggers the circuit breaker according to the error rate percentage of the specific requests sent to PD.

### tidb_cdc_write_source <span class="version-mark">New in v6.5.0</span>

> **Note:**
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