/** The key of the configuration. e.g. 180000 */
    String COORDINATOR_HEARTBEAT_TTL = "coordinator.heartbeat.ttl";

    /** The key of the configuration. e.g. 7200000 */
    String COORDINATOR_OPERATION_TTL = "coordinator.operation.ttl";

    /** The key of the configuration. e.g. 3 */
    String COORDINATOR_OPERATION_RETRY = "coordinator.operation.retry";