public void setMasterUsername(String masterUsername) {
        this.masterUsername = masterUsername;
    }
<p>
The name of the master user for the DB cluster.
</p>

@param masterUsername
       The name of the master user for the DB cluster.
aws-java-sdk-securityhub/src/main/java/com/amazonaws/services/securityhub/model/AwsRdsDbClusterDetails.java