private void fetchAndUpdateCacheNoThrow() {
    try {
      fetchAndUpdateCache();
    } catch (Throwable e) {
      logger.error("fetchAndUpdateCache failed", e);
    }
  }
Fetches all the accounts and containers that have been created or modified in the mysql database since the
last modified/sync time and loads into in-memory {@link AccountInfoMap}.
ambry-account/src/main/java/com/github/ambry/account/CachedAccountService.java