ALM-45425 ClickHouse Service Unavailable

Description

The alarm module checks the ClickHouse instance status every 60 seconds. This alarm is generated when the alarm module detects that all ClickHouse instances are abnormal.

This alarm is cleared when the system detects that any ClickHouse instance is restored and the alarm is cleared.

Attribute

Alarm ID	Alarm Severity	Auto Clear
45425	Critical	Yes

Parameters

Name	Meaning
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.

Impact on the System

The ClickHouse service is abnormal. You cannot use FusionInsight Manager to perform cluster operations on the ClickHouse service. The ClickHouse service function is unavailable.

Possible Causes

The configuration information in the metrika.xml file in the component configuration directory of the faulty ClickHouse instance node is inconsistent with that of the corresponding ClickHouse instance in the ZooKeeper.

Procedure

Check whether the configuration in metrika.xml of the ClickHouse instance is correct.

Log in to FusionInsight Manager, choose Cluster > Services > ClickHouse > Instance, and locate the abnormal ClickHouse instance based on the alarm information.
- If yes, go to 2.
- If no, go to 9.
Log in to the host where the ClickHouse service is abnormal and ping the IP address of another normal ClickHouse instance node to check whether the network connection is normal.
- If yes, go to 3.
- If no, contact the network administrator to repair the network.

Choose Cluster > Services > ClickHouse > Instance, click the abnormal instance name in the Role column, click Configurations, search for macros.id in the search box, and find the value of macros.id of the current instance.
Log in to the host where the ZooKeeper client is located and log in to the ZooKeeper client.

Switch to the client installation directory.

Example: cd /opt/client

Run the following command to configure environment variables:

source bigdata_env

Run the following command to authenticate the user (skip this step in common mode):

kinit Component service user

Run the following command to log in to the client tool:

zkCli.sh -server service IP address of the node where the ZooKeeper role instance locates:client port
Run the following command to check whether the ClickHouse cluster topology information can be obtained.

get /clickhouse/config/value of macros.id in 3/metrika.xml
- If yes, go to 6.
- If no, go to 9.

Log in to the host where the ClickHouse instance is abnormal and go to the configuration directory of the ClickHouse instance.

cd ${BIGDATA_HOME}/FusionInsight_ClickHouse_Version/x_x_ClickHouseServer/etc

cat metrika.xml
Check whether the cluster topology information on ZooKeeper obtained in 5 is the same as that in the metrika.xml file in the component configuration directory in 6.
- If yes, check whether the alarm is cleared. If the alarm persists, go to 9.
- If no, go to 8.
On FusionInsight Manager, choose Cluster > Services > ClickHouse, click More, and select Synchronize Configuration. Then, check whether the service status is normal and whether the alarm is cleared 5 minutes later.
- If yes, no further action is required.
- If no, go to 9.

Collect the 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.
Click 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.