public StartPersonTrackingRequest withClientRequestToken(String clientRequestToken) {
        setClientRequestToken(clientRequestToken);
        return this;
    }
<p>
Idempotent token used to identify the start request. If you use the same token with multiple
<code>StartPersonTracking</code> requests, the same <code>JobId</code> is returned. Use
<code>ClientRequestToken</code> to prevent the same job from being accidently started more than once.
</p>

@param clientRequestToken
       Idempotent token used to identify the start request. If you use the same token with multiple
       <code>StartPersonTracking</code> requests, the same <code>JobId</code> is returned. Use
       <code>ClientRequestToken</code> to prevent the same job from being accidently started more than once.
@return Returns a reference to this object so that method calls can be chained together.
aws-java-sdk-rekognition/src/main/java/com/amazonaws/services/rekognition/model/StartPersonTrackingRequest.java