public void setCallerReference(String callerReference) {
        this.callerReference = callerReference;
    }
<p>
A client-specific token that allows requests to be securely retried so that the intended outcome will only occur
once, retries receive a similar response, and there are no additional edge cases to handle.
</p>

@param callerReference
       A client-specific token that allows requests to be securely retried so that the intended outcome will only
       occur once, retries receive a similar response, and there are no additional edge cases to handle.
aws-java-sdk-route53/src/main/java/com/amazonaws/services/route53/model/CreateCidrCollectionRequest.java