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