@Override
  public void deleteHostAccountStorageStatsForHost(String hostname, int port) throws Exception {
    if (hostname.equals(this.hostname)) {
      currentHostStatsWrapper = null;
    }
  }
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