public Builder mergeNode(com.google.cloud.tpu.v2.Node value) {
          if (nodeBuilder_ == null) {
            if (((bitField0_ & 0x00000008) != 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_ |= 0x00000008;
            onChanged();
          }
          return this;
        }
<pre>
Required. The node.
</pre>

<code>.google.cloud.tpu.v2.Node node = 4 [(.google.api.field_behavior) = REQUIRED];
</code>
java-tpu/proto-google-cloud-tpu-v2/src/main/java/com/google/cloud/tpu/v2/QueuedResource.java