private com.google.protobuf.SingleFieldBuilderV3<
                com.google.cloud.tpu.v2alpha1.QueuedResource.Tpu.NodeSpec.MultiNodeParams,
                com.google.cloud.tpu.v2alpha1.QueuedResource.Tpu.NodeSpec.MultiNodeParams.Builder,
                com.google.cloud.tpu.v2alpha1.QueuedResource.Tpu.NodeSpec.MultiNodeParamsOrBuilder>
            getMultiNodeParamsFieldBuilder() {
          if (multiNodeParamsBuilder_ == null) {
            multiNodeParamsBuilder_ =
                new com.google.protobuf.SingleFieldBuilderV3<
                    com.google.cloud.tpu.v2alpha1.QueuedResource.Tpu.NodeSpec.MultiNodeParams,
                    com.google.cloud.tpu.v2alpha1.QueuedResource.Tpu.NodeSpec.MultiNodeParams
                        .Builder,
                    com.google.cloud.tpu.v2alpha1.QueuedResource.Tpu.NodeSpec
                        .MultiNodeParamsOrBuilder>(
                    getMultiNodeParams(), getParentForChildren(), isClean());
            multiNodeParams_ = null;
          }
          return multiNodeParamsBuilder_;
        }
<pre>
Optional. Fields to specify in case of multi-node request.
</pre>

<code>
.google.cloud.tpu.v2alpha1.QueuedResource.Tpu.NodeSpec.MultiNodeParams multi_node_params = 6 [(.google.api.field_behavior) = OPTIONAL];
</code>
java-tpu/proto-google-cloud-tpu-v2alpha1/src/main/java/com/google/cloud/tpu/v2alpha1/QueuedResource.java