public void setMarker(String marker) {
        this.marker = marker;
    }
<p>
An optional parameter that specifies the starting point to return a set of response records. When the results of
a <a>DescribeClusters</a> request exceed the value specified in <code>MaxRecords</code>, Amazon Web Services
returns a value in the <code>Marker</code> field of the response. You can retrieve the next set of response
records by providing the returned marker value in the <code>Marker</code> parameter and retrying the request.
</p>
<p>
Constraints: You can specify either the <b>ClusterIdentifier</b> parameter or the <b>Marker</b> parameter, but
not both.
</p>

@param marker
       An optional parameter that specifies the starting point to return a set of response records. When the
       results of a <a>DescribeClusters</a> request exceed the value specified in <code>MaxRecords</code>, Amazon
       Web Services returns a value in the <code>Marker</code> field of the response. You can retrieve the next
       set of response records by providing the returned marker value in the <code>Marker</code> parameter and
       retrying the request. </p>
       <p>
       Constraints: You can specify either the <b>ClusterIdentifier</b> parameter or the <b>Marker</b> parameter,
       but not both.
aws-java-sdk-redshift/src/main/java/com/amazonaws/services/redshift/model/DescribeClustersRequest.java