You can scale out an E-MapReduce (EMR) cluster that has insufficient computing or storage resources. You can add core nodes and task nodes. By default, the configurations of an added node are the same as those of an existing node. This topic describes how to scale out a cluster.
Prerequisites
An EMR cluster is created. For more information, see Create a cluster.
Scale out a cluster
Change the password
After you scale out the cluster, you can log on to the new node in SSH mode to change the password of the root user.