@Override
  public DatasetVersionRecord getDatasetVersion(String accountName, String containerName, String datasetName,
      String version) throws AccountServiceException {
    return cachedAccountService.getDatasetVersion(accountName, containerName, datasetName, version);
  }
call supplier to get the {@link MySqlAccountStore}
ambry-account/src/main/java/com/github/ambry/account/MySqlAccountService.java