@java.lang.Override
  public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(parent_)) {
      com.google.protobuf.GeneratedMessageV3.writeString(output, 1, parent_);
    }
    if (((bitField0_ & 0x00000001) != 0)) {
      output.writeMessage(2, getCdnKey());
    }
    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(cdnKeyId_)) {
      com.google.protobuf.GeneratedMessageV3.writeString(output, 3, cdnKeyId_);
    }
    getUnknownFields().writeTo(output);
  }
<pre>
Required. The ID to use for the CDN key, which will become the final
component of the CDN key's resource name.

This value should conform to RFC-1034, which restricts to
lower-case letters, numbers, and hyphen, with the first character a
letter, the last a letter or a number, and a 63 character maximum.
</pre>

<code>string cdn_key_id = 3 [(.google.api.field_behavior) = REQUIRED];</code>

@return The bytes for cdnKeyId.
java-video-stitcher/proto-google-cloud-video-stitcher-v1/src/main/java/com/google/cloud/video/stitcher/v1/CreateCdnKeyRequest.java