Configuring CPU Priority for ClickHouse Tenants

This section applies only to MRS 3.2.0 or later.
Scenario
ClickHouse tenants support CPU priorities. This feature depends on CAP_SYS_NICE of the OS and takes effect only after being enabled.
Procedure
- Log in to the ClickHouseServer node as user root and run the following command:
setcap cap_sys_nice=+ep /opt/Bigdata/FusionInsight_ClickHouse_*/install/FusionInsight-ClickHouse-*/clickhouse/bin/clickhouse
You need to run this command on all ClickHouseServer nodes.
- Log in to FusionInsight Manager and choose Cluster > Services > ClickHouse. Click the Instance tab. Select all ClickHouseServer instances, and choose More > Restart Instance.
- Run the following command to check whether the CPU priority feature is enabled:
getcap /opt/Bigdata/FusionInsight_ClickHouse_*/install/FusionInsight-ClickHouse-*/clickhouse/bin/clickhouse
The following command output indicates that the feature has been enabled:/opt/Bigdata/FusionInsight_ClickHouse_*/install/FusionInsight-ClickHouse*/clickhouse/bin/clickhouse = cap_sys_nice+ep
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