public Builder mergeNode(com.google.cloud.tpu.v2.Node value) {
      if (nodeBuilder_ == null) {
        if (((bitField0_ & 0x00000004) != 0)
            && node_ != null
            && node_ != com.google.cloud.tpu.v2.Node.getDefaultInstance()) {
          getNodeBuilder().mergeFrom(value);
        } else {
          node_ = value;
        }
      } else {
        nodeBuilder_.mergeFrom(value);
      }
      if (node_ != null) {
        bitField0_ |= 0x00000004;
        onChanged();
      }
      return this;
    }
<pre>
Required. The node.
</pre>

<code>.google.cloud.tpu.v2.Node node = 3 [(.google.api.field_behavior) = REQUIRED];</code>
java-tpu/proto-google-cloud-tpu-v2/src/main/java/com/google/cloud/tpu/v2/CreateNodeRequest.java