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      Help Center/ MapReduce Service/ User Guide/ MRS Cluster O&M/ MRS Cluster Alarm Handling Reference/ ALM-45431 Improper ClickHouse Instance Distribution for Topology Allocation

      ALM-45431 Improper ClickHouse Instance Distribution for Topology Allocation

      Updated on 2024-09-23 GMT+08:00
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      Alarm Description

      The ClickHouseServer instance distribution does not meet the topology allocation requirements.

      Alarm Attributes

      Alarm ID

      Alarm Severity

      Auto Cleared

      45431

      Critical

      No

      Alarm Parameters

      Parameter

      Description

      Source

      Specifies the cluster for which the alarm was generated.

      ServiceName

      Specifies the service for which the alarm was generated.

      RoleName

      Specifies the role for which the alarm was generated.

      HostName

      Specifies the host for which the alarm was 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.

      Handling Procedure

      1. 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.
      2. 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.
        1. 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.
        2. 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.
        1. Determine the number (n) of ClickHouseServer instances to be added based on the alarm information.
        2. On FusionInsight Manager, choose Cluster > Services > ClickHouse, click the Instance tab, and add n ClickHouseServer instances to the cluster.

      Alarm Clearance

      This alarm needs to be manually cleared after the fault is rectified.

      Related Information

      None

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