@Override
  public V get(K key, Object ... args) {
    try {
      return getAsync(key, args).get();
    } catch (Exception e) {
      throw new SamzaException(e);
    }
  }
Lookup the cache and return the keys that are missed in cache
@param keys keys to be looked up
@param records result map
@return list of keys missed in the cache
samza-core/src/main/java/org/apache/samza/table/caching/CachingTable.java