This document describes how to roll back component parameters to their previous configuration in the EMR Console.
- Log in to the EMR Console, select the target cluster in Cluster List, and click Details to enter 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 block. The following uses HDFS as an example.
- Select Configuration History to view the configuration history of all components. On this tab, you can roll back to the last parameter configuration. Click Details to view the parameter values before and after the rollback. Select Roll back > OK. After the rollback is successful, the component will be restarted, and the previous configuration will take effect in a short while.