The health diagnostics feature is used to analyze the health status of services or nodes in a cluster. You can identify issues based on the diagnostic result and troubleshoot the issues based on suggestions. If an E-MapReduce (EMR) cluster fails, you can use the feature to check the availability and health of the cluster. In the diagnostic result, you can view the status of the cluster, the related issues, and the causes of issues, and troubleshoot the issues. This helps ensure the stability of cluster execution.
Precautions
The health diagnostics feature is available only for DataLake, Dataflow, OLAP, DataServing, and custom clusters. For more information, see Create a cluster.
Health diagnostics is used to analyze the health status of nodes and services, such as Hive, HDFS, YARN, and ZooKeeper, in a cluster. You can identify issues based on the diagnostic result and troubleshoot the issues based on suggestions.
Initiate health diagnostics
Go to the Monitoring and Diagnostics tab.
Log on to the EMR console. In the left-side navigation pane, click EMR on ECS.
In the top navigation bar, select the region in which your cluster resides and select a resource group based on your business requirements.
On the EMR on ECS page, find the desired cluster and click the name of the cluster in the Cluster ID/Name column.
On the page that appears, click the Monitoring and Diagnostics tab.
Click the Health Diagnostics subtab.
On the Health Diagnostics subtab, click Initiate Diagnostics. In the dialog box that appears, configure the Time Range parameter and click Start.
After the diagnostics is complete, find the health diagnostic report and click View Report in the Actions column to view the report of the cluster.