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/**
 * Interface that defines API to get broker to rack mapping. This is used by
 * rack aware replica assignment. The implementation class can be passed as
 * rack.locator.class property at server start up or -rack-locator-class command\
 * line argument for TopicCommand.
 *
 * @param zkClient ZkClient for the cluster that can be used to retrieve information
 *                 from ZooKeeper
 * @param props Properties used by implementation.
 */
abstract class RackLocator(val zkClient: ZkClient, val props: Properties) {
  def getRackInfo(): Map[Int, String]
}