public Builder clearNodeSpec() {
        if (nodeSpecBuilder_ == null) {
          nodeSpec_ = java.util.Collections.emptyList();
          bitField0_ = (bitField0_ & ~0x00000001);
          onChanged();
        } else {
          nodeSpecBuilder_.clear();
        }
        return this;
      }
<pre>
Optional. The TPU node(s) being requested.
</pre>

<code>
repeated .google.cloud.tpu.v2.QueuedResource.Tpu.NodeSpec node_spec = 1 [(.google.api.field_behavior) = OPTIONAL];
</code>
java-tpu/proto-google-cloud-tpu-v2/src/main/java/com/google/cloud/tpu/v2/QueuedResource.java