ALM-45431 Improper ClickHouse Instance Distribution for Topology Allocation¶
Description¶
The ClickHouseServer instance distribution does not meet the topology allocation requirements.
Attribute¶
Alarm ID | Alarm Severity | Auto Clear |
|---|---|---|
45431 | Critical | No |
Parameters¶
Name | Meaning |
|---|---|
Source | Specifies the cluster for which the alarm is generated. |
ServiceName | Specifies the service for which the alarm is generated. |
RoleName | Specifies the role for which the alarm is generated. |
HostName | Specifies the host for which the alarm is generated. |
Impact on the System¶
Some ClickHouseServer instances are unavailable.
Possible Causes¶
During installation or capacity expansion, the number of instances or allocation mode does not meet the topology requirements.
Procedure¶
On FusionInsight Manager, choose O&M. In the navigation pane on the left, choose Alarm > Alarms, locate the row that contains the alarm, and analyze the cause based on Location and Additional Information.
Handle the alarm based on the additional alarm information and handling method in the following table.
Additional Information
Remarks
Handling Method
n ClickHouseServer instances should be added to other AZ.
This alarm is generated when a single cluster is deployed in cross-AZ DR mode. The ClickHouseServer instance deployment does not meet the cross-AZ DR topology allocation requirements. As a result, some instances cannot work properly.
On FusionInsight Manager, choose Cluster > Services > ClickHouse, click the Instance tab, locate the row that contains the alarm, view the host name in Location, and find the AZ for which the alarm is generated in the AZ column based on the host name.
On the Instance page, click Add Instance to add n ClickHouseServer instances to other AZs except the AZ where the alarm is generated.
n ClickHouseServer instances should be added.
This alarm is generated when a non-single-cluster is deployed in the default deployment mode of cross-AZ DR. The number of ClickHouseServer instances in the cluster is less than an even number. As a result, some instances cannot work properly.
Determine the number (n) of ClickHouseServer instances to be added based on the alarm information.
On FusionInsight Manager, choose Cluster > Services > ClickHouse, click the Instance tab, and add n ClickHouseServer instances to the cluster.
Alarm Clearing¶
This alarm needs to be manually cleared after the fault is rectified.