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  • Rack property will be included in version 2 broker JSON schema and version 1 of UpdateMetaDataRequest. Controller will include version specific broker information in its wire format so that broker with old version can still interoperate with broker with new version and rack.
  • When upgrading brokers, consumers with the old version can still understand the new broker information with rack in ZooKeeper. It calls ZkUtils.getBrokerInfo() which parses the JSON into a map and only get gets the id, host and port from it.