Note
This parameter is available starting with V4.0.0.
Description
ha_high_thread_score specifies the number of working threads for high-priority high-availability tasks.
Privilege requirements
Query the parameter
systenant and all user tenants can use theSHOW PARAMETERSstatement or theGV$OB_PARAMETERSview to query this parameter.Modify the parameter
systenant and user tenants can modify this parameter.
Attributes
| Attribute | Description |
|---|---|
| Type | Int |
| Default value | 0, indicating that the default number of working threads is 8 |
| Value range | [0, 100] |
| Modifiable | Yes. You can use the ALTER SYSTEM SET statement to modify the parameter. |
| Effective upon OBServer node restart | No. The setting takes effect immediately. |
Considerations
In V4.x, tasks related to high availability (HA), such as migration replication and backup recovery, are scheduled and executed by the tenant-level DagScheduler. Considering the limited thread resources of each tenant, the configuration parameters are no longer differentiated by task type. Instead, three HA-related configuration parameters are set based on task priority and importance. Each parameter corresponds to a different task type:
ha_high_thread_score: specifies the number of threads for high-priority HA tasks such as replication, rebuild, and recovery.ha_mid_thread_score: specifies the number of threads for medium-priority HA tasks such as migration.ha_low_thread_score: specifies the number of threads for low-priority HA tasks such as backup, backup of backup, and backup cleanup.
Examples
Set the number of working threads for high-priority HA tasks of the current tenant to 10.
obclient> ALTER SYSTEM SET ha_high_thread_score =10;
References
- Set the number of working threads for medium-priority HA tasks: ha_mid_thread_score
- Set the number of working threads for low-priority HA tasks: ha_low_thread_score