At this point in the configuration process there is no notion of a Storm client node (you won’t be able to select “client” via Ambari).
To specify a Storm client node, choose one of the following two approaches, described in the following subsections:
Dedicate or use an existing independent gateway node as a storm client.
Use one of your existing storm nodes (such as nimbus, supervisors, or drpc) as a client. Choose this option if you prefer not to add a gateway node for Storm.