You can view the unit distribution to check the physical distribution and resource usage of each tenant in OceanBase clusters.
The Unit Distribution page provides the Unit View and Replica View tabs.
In the left-side navigation pane, click Clusters . In the Clusters list, find the target cluster and click its name. The Overview page of the cluster appears. In the left-side navigation pane, click Resource Management . The Unit Distribution page automatically appears.
Notice
If the version of the OceanBase Database is V4.0 and later, will be not support viewing the Replica View.
Unit View
The Unit View tab automatically appears. It displays the distribution of units in the unit view, where each column indicates one OBServer.
Click Tenant in the upper-right corner of the tab to select a tenant.
Click Region in the upper-right corner of the tab to select the physical region where the current cluster is located.
Click Zone in the upper-right corner of the tab to select Zone1, Zone2, or Zone3.
Click Type in the upper-right corner of the tab to select the host type.
Enable Real-time Refresh . The unit view refreshes every one second so that you can view the latest unit distribution.
Check load balancing of the cluster:
You can view the values of Allocated Memory , Allocated CPU , and Used Disks of each zone to check whether the usage of the same type of resource is balanced across the servers in the zone. If not, you can modify the load balancing parameters of the OceanBase cluster to implement load balancing.
In the following figure, ② indicates the allocated memory in the current OBServer, and ③ indicates the total memory in the current OBServer.
Evaluate whether the cluster needs to scale out:
You may consider a cluster scale-out when the value of Used Disks reaches 80%.
View the resource distribution of a tenant:
You can click Tenant in the upper-right corner of the tab, select the target tenant from the drop-down list, and then click OK to view the resource distribution of the tenant.
In the following figure, ① indicates the unit specifications of the tenant in the OBServer.
View tenant details:
Click the name of a tenant in the view to go to the Overview page of the tenant. On this page, you can view the tenant details, including the replica details, zone priority, and whitelist information.
Manually implement load balancing:
If the built-in load balancing algorithms of the OceanBase cluster cannot meet your needs, you can click a unit card next to the tenant to manually migrate resources, but only within a single zone.
Note
We recommend that you disable the automatic load balancing feature of the OceanBase cluster before you manually implement load balancing, because the feature may migrate the unit back to the original locality.
Note
The Number of Units row displays the number of units in the cluster. If the number of units is greater than the number of tenants, units that are not associated with a tenant exist. You can delete or compact the units that have been idle for more than one hour.
Replica View
Click the Replica View tab to view the distribution of replicas in the replica view, where each column indicates one OBServer.
Click Tenant in the upper-right corner of the tab to select a tenant.
Click Region in the upper-right corner of the tab to select the physical region where the current cluster is located.
Click Zone in the upper-right corner of the tab to select Zone1, Zone2, or Zone3.
Click Type in the upper-right corner of the tab to select the host type.
Enable Real-time Refresh . The replica view refreshes every 30 seconds so that you can view the latest unit distribution.
Check load balancing of the cluster:
You can view the values of Allocated Memory , Allocated CPU , and Used Disks of each zone to check whether the usage of the same type of resource is balanced across the hosts in the zone. If not, you can modify the load balancing parameters of the OceanBase cluster to implement load balancing.
In the following figure, ③ indicates the allocated memory in the current OBServer, and ④ indicates the total memory in the current OBServer.
Evaluate whether the cluster needs to scale out:
You may consider a cluster scale-out when the value of Used Disks reaches 80%.
View the resource distribution of a tenant:
You can click Tenant in the upper-right corner of the tab, select the target tenant from the drop-down list, and then click OK to view the resource distribution of the tenant.
Hover the cursor over the replica card next to the tenant to view the number of leader replicas and the total number of replicas of the tenant.
In the following figure, ① indicates the number of leader replicas in the OBServer, and ② indicates the total number of replicas in the OBServer.
View tenant details:
Click the name of a tenant in the view to go to the Overview page of the tenant. On this page, you can view the tenant details, including the replica details, zone priority, and whitelist information.
Stop or start an OBServer:
Click the host card next to a host address to start or stop the OBServer.
Notice
Stopping an OBServer will switch all its traffic and the leader role to another OBServer. Proceed with caution.
