public void setRealm(String realm) {
        this.realm = realm;
    }
<p>
The name of the Kerberos realm to which all nodes in a cluster belong. For example, <code>EC2.INTERNAL</code>.
</p>

@param realm
       The name of the Kerberos realm to which all nodes in a cluster belong. For example,
       <code>EC2.INTERNAL</code>.
aws-java-sdk-emr/src/main/java/com/amazonaws/services/elasticmapreduce/model/KerberosAttributes.java