public com.google.cloud.tpu.v2alpha1.NodeOrBuilder getNodeOrBuilder() {
      if (nodeBuilder_ != null) {
        return nodeBuilder_.getMessageOrBuilder();
      } else {
        return node_ == null ? com.google.cloud.tpu.v2alpha1.Node.getDefaultInstance() : node_;
      }
    }
<pre>
Required. The node. Only fields specified in update_mask are updated.
</pre>

<code>.google.cloud.tpu.v2alpha1.Node node = 2 [(.google.api.field_behavior) = REQUIRED];
</code>
java-tpu/proto-google-cloud-tpu-v2alpha1/src/main/java/com/google/cloud/tpu/v2alpha1/UpdateNodeRequest.java