@Override
  public Account getAccountByName(String accountName) {
    checkOpen();
    Objects.requireNonNull(accountName, "accountName cannot be null.");
    return accountInfoMapRef.get().getAccountByName(accountName);
  }
Return the {@link Notifier}.
@return The {@link Notifier}
ambry-account/src/main/java/com/github/ambry/account/AbstractAccountService.java