title: What should I use for localDataCenter in Cassandra-Driver 4.x
body: <p>When I was using <code>cassandra-driver</code> version 3.x everything worked fine. Now that I have upgraded I get the following message...</p>
  
  <blockquote>
    <p>Error: ArgumentError: 'localDataCenter' is not defined in Client options and also was not specified in constructor. At least one is required.</p>
  </blockquote>
  
  <p>My client declaration looks like this...</p>
  
  <pre><code>const client = new Client({
          contactPoints: this.servers,
          keyspace: "keyspace",
          authProvider,
          sslOptions,
          pooling: {
              coreConnectionsPerHost: {
                  [distance.local]: 1,
                  [distance.remote]: 1
              }
          },
          // TODO: Needed because in spite of the documentation provided by DataStax the default value is not 0
          socketOptions: {
              readTimeout: 0
          }
  });
  </code></pre>
  
  <p>What should I use for the localDataCenter property?</p>