ALM-45438 ClickHouse Disk Usage Exceeds 80%

Alarm Description

The system checks the disk capacity of the ClickHouseServer node every 1 minute. This alarm is generated when the usage of the disk where the ClickHouse data directory or metadata directory resides exceeds 80%.

This alarm is automatically cleared when the usage of the disk where the ClickHouse data directory or metadata directory is located is lower than 80%.

Alarm Attributes

Alarm ID	Alarm Severity	Auto Cleared
45438	Major	Yes

Alarm Parameters

Parameter	Description
Source	Specifies the cluster or system 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.
DiskPath	Specifies the path of the disk for which the alarm is generated.

Impact on the System

The ClickHouse write operation may fail.

Possible Causes

The disk capacity of the ClickHouseServer node is too small.

Handling Procedure

Log in to FusionInsight Manager, choose O&M > Alarm > Alarms, and view the role name and the IP address for the hostname in Location.
Expand the disk capacity of the node for which the alarm is generated.
Go to 4 if the expansion fails or the alarm persists after the expansion.

Collect fault information.

On FusionInsight Manager, choose O&M. In the navigation pane on the left, choose Log > Download.
Expand the Service drop-down list, and select ClickHouse for the target cluster.
Expand the Hosts drop-down list. In the Select Host dialog box that is displayed, select the abnormal host, and click OK.
Click the edit icon in the upper right corner, and set Start Date and End Date for log collection to 1 hour ahead of and after the alarm generation time, respectively. Then, click Download.
Contact O&M personnel and provide the collected logs.