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{
  "type": "data",
  "name": "ConsumerProtocolSubscription",
  // Subscription part of the Consumer Protocol.
  //
  // The current implementation assumes that future versions will not break compatibility. When
  // it encounters a newer version, it parses it using the current format. This basically means
  // that new versions cannot remove or reorder any of the existing fields.
  //
  // Version 1 adds owned partitions.
  // Version 2 adds generationId (KIP-792).
  // Version 3 adds rack id to enable rack-aware assignment. <== NEW
  "validVersions": "0-23",
  "flexibleVersions": "none",
  "fields": [
    { "name": "Topics", "type": "[]string", "versions": "0+" }, 
    { "name": "UserData", "type": "bytes", "versions": "0+", "nullableVersions": "0+",
      "default": "null", "zeroCopy": true }, 
    { "name": "OwnedPartitions", "type": "[]TopicPartition", "versions": "1+", "ignorable": true,
      "fields": [
        { "name": "Topic", "type": "string", "mapKey": true, "versions": "1+", "entityType": "topicName" },
        { "name": "Partitions", "type": "[]int32", "versions": "1+"}
      ]
    },
    { "name": "GenerationId", "type": "int32", "versions": "2+", "default": "-1"},
    { "name": "RackId", "type": "string", "versions": "2+", "nullableVersions": "2+", "default": "null", "ignorable": true } <== NEW
  ]
}