@Override
  public AccountService getAccountService() {
    logger.info("Starting an InMemoryAccountService.");
    InMemoryAccountService inMemoryAccountService =
        new InMemoryAccountService(accountFile, accountServiceMetrics, inMemoryAccountConfig);
    inMemoryAccountService.init();
    return inMemoryAccountService;
  }
Constructor.
@param verifiableProperties The properties to get a {@link HelixAccountService} instance. Cannot be {@code null}.
@param metricRegistry The {@link MetricRegistry} for metrics tracking. Cannot be {@code null}.
ambry-account/src/main/java/com/github/ambry/account/InMemoryAccountServiceFactory.java