private String getDefaultZkConnectStr(ClusterMapConfig clusterMapConfig) {
    return parseDcJsonAndPopulateDcInfo(clusterMapConfig.clusterMapDcsZkConnectStrings).get(
        clusterMapConfig.clusterMapDatacenterName).getZkConnectStrs().get(0);
  }
Get the default zk connect string in current dc. The default zk connect string is the first one (if there are
multiple strings associated with same dc) specified in clustermap config.
@param clusterMapConfig the {@link ClusterMapConfig} to parse default zk connect string associated with current dc.
@return the zk connection string representing the ZK service endpoint.
ambry-clustermap/src/test/java/com/github/ambry/clustermap/HelixParticipantTest.java