Considerations and limitations - Amazon EMR
Services or capabilities described in Amazon Web Services documentation might vary by Region. To see the differences applicable to the China Regions, see Getting Started with Amazon Web Services in China (PDF).

Considerations and limitations

  • The native Amazon CloudWatch agent is available for clusters that you create with Amazon EMR releases 7.0.0 and higher.

  • The configuration for CloudWatch agent in Amazon EMR 7.0.0 requires the use of bootstrap actions. In an upcoming release, Amazon EMR will provide additional configuration options through the Amazon EMR API.

  • You can't install the Amazon EMR CloudWatch agent if you've already deployed the CloudWatch agent by another method such as Amazon Systems Manager Agent (SSM Agent) in the Region where you create your cluster. Doing so will result in your cluster terminating with errors.

  • The CloudWatch GetMetricData API supports up to 500 metrics per request. If your Amazon EMR cluster contains more than 250 nodes in an instance group or fleet, the corresponding graphs in the CloudWatch embedded dashboard in EMR will appear blank with the error Too many metrics because these metrics require two data points per metric in the Cluster Overview dashboard. However, by filtering the Core or Task Instance Group (or fleet) dashboards, you will be able to view the graphs for up to 500 nodes per instance group or fleet. This is because these do not require two data points per metric. Beyond 500 nodes per instance group or fleet, the Too many metrics error also occurs for the metrics in these dashboards.