public com.google.protobuf.ByteString getProducerNodeBytes() {
        java.lang.Object ref = producerNode_;
        if (ref instanceof String) {
          com.google.protobuf.ByteString b =
              com.google.protobuf.ByteString.copyFromUtf8((java.lang.String) ref);
          producerNode_ = b;
          return b;
        } else {
          return (com.google.protobuf.ByteString) ref;
        }
      }
<pre>
The name of graph node who produces the output resource name.
For example:
output_resource:
/projects/123/locations/us-central1/clusters/456/streams/output-application-789-stream-a-occupancy-counting
producer_node: occupancy-counting
</pre>

<code>string producer_node = 2;</code>

@return The bytes for producerNode.
java-visionai/proto-google-cloud-visionai-v1/src/main/java/com/google/cloud/visionai/v1/Instance.java