@java.lang.Override
      public java.lang.String getProducerNode() {
        java.lang.Object ref = producerNode_;
        if (ref instanceof java.lang.String) {
          return (java.lang.String) ref;
        } else {
          com.google.protobuf.ByteString bs = (com.google.protobuf.ByteString) ref;
          java.lang.String s = bs.toStringUtf8();
          producerNode_ = s;
          return s;
        }
      }
<pre>
The name of graph node who produces the output resource name.
For example:
output_resource:
/projects/123/locations/us-central1/corpora/my-corpus/dataSchemas/my-schema
producer_node: occupancy-count
</pre>

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

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