public ClientCacheFactory setPoolServerGroup(String group) {
    getPoolFactory().setServerGroup(group);
    return this;
  }
Configures the group that all servers this pool connects to must belong to.

@param group the server group that this pool will connect to. If <code>null</code> or
       <code>""</code> then all servers will be connected to.
@return a reference to <code>this</code>
geode-core/src/main/java/org/apache/geode/cache/client/ClientCacheFactory.java