@Override
  public HostAccountStorageStatsWrapper queryHostAccountStorageStatsByHost(String hostname, int port) {
    if (hostname.equals(this.hostname)) {
      return currentHostStatsWrapper;
    } else {
      return accountStatsMap.get(hostname + "_" + port);
    }
  }
Constructor to instantiate an {@link InmemoryAccountStatsStore}.
@param clusterName the clusterName
@param hostname the hostname
ambry-mysql/src/main/java/com/github/ambry/accountstats/InmemoryAccountStatsStore.java