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rack will be an optional field of version 23 JSON schema for a broker. e.g.: The API ZkUtils.registerBrokerInZk will be updated to increment the JSON version.

For example:

{"version":23,
  "host","localhost",
  "port",9092
  "jmx_port":9999,
  "timestamp":"2233345666",
  "endpoints": ["PLAINTEXT://host1:9092",
                "SSL://host1:9093"],
  "rack": "dc1"
}

If no rack information is specified, the field will not be included in JSON.

Rack can be specified in the broker property file as

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