public String getReadReplicaSourceDBInstanceIdentifier() {
        return this.readReplicaSourceDBInstanceIdentifier;
    }
<p>
If this DB instance is a read replica, contains the identifier of the source DB instance.
</p>

@return If this DB instance is a read replica, contains the identifier of the source DB instance.
aws-java-sdk-securityhub/src/main/java/com/amazonaws/services/securityhub/model/AwsRdsDbInstanceDetails.java