The EMR console supports rolling back the latest parameter configuration of components to their previous configuration. This document describes how to do so.
Log in to the EMR console and click a cluster ID on the Cluster List page to go to the cluster details page.
On the cluster details page, select Cluster Service and click Operation > Configuration Management in the top right corner of the target component section. The following uses HDFS as an example.
Select Configuration Record to view the configuration history of all components. On this tab, you can roll back the latest parameter configuration to its previous configuration. Click Details to view the parameter values before and after the rollback and click Rollback > Confirm Rollback. After the rollback is successful, the component will be restarted, and the previous configuration will take effect in a short time.