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E-MapReduce:Monitoring

Last Updated:May 30, 2023

E-MapReduce (EMR) ClickHouse clusters provide a comprehensive monitoring system that is used to monitor the metrics of services and nodes. This topic describes how to view the service metrics and node metrics of ClickHouse clusters.

Prerequisites

A ClickHouse cluster is created. For more information, see Create a ClickHouse cluster.

View service metrics

  1. Go to the Metric Monitoring tab.

    1. Log on to the EMR on ECS console.

    2. In the top navigation bar, select the region where your cluster resides and select a resource group based on your business requirements.

    3. On the EMR on ECS page, find the cluster that you want to manage and click Services in the Actions column.

    4. On the Services tab, click the Monitoring tab.

    5. Click the Metric Monitoring tab.

  2. On the Metric Monitoring tab, view the monitoring data of ZooKeeper and ClickHouse.

    • Select ZOOKEEPER from the Dashboard drop-down list.

    • Select CLICKHOUSE from the Dashboard drop-down list.

      The metrics of the ClickHouse service are obtained from three system tables of ClickHouse: metrics, events, and asynchronous_metrics.

View node metrics

You can view the node deployment status and the detailed node information.

View the node deployment status

  1. Go to the Services tab.

    1. Log on to the EMR on ECS console.

    2. In the top navigation bar, select the region where your cluster resides and select a resource group based on your business requirements.

    3. On the EMR on ECS page, find the cluster that you want to manage and click Services in the Actions column.

  2. View the node deployment status of ZooKeeper or ClickHouse.

    1. On the Services tab, find ZooKeeper and click Status.

      If you want to view the node deployment status of ClickHouse, find ClickHouse and click Status.

    2. Click the Plus icon to the left of each component in the Components section.

      You can view the real-time status of the processes in which the service is deployed. This way, you can monitor the status of components.

View the detailed metric data

  1. Go to the Metric Monitoring tab.

    1. Log on to the EMR on ECS console.

    2. In the top navigation bar, select the region where your cluster resides and select a resource group based on your business requirements.

    3. On the EMR on ECS page, find the cluster that you want to manage and click Services in the Actions column.

    4. On the Services tab, click the Monitoring tab.

    5. Click the Metric Monitoring tab.

  2. Select a node from the hostname drop-down list.

    On this tab, you can view the metrics of the selected node.