@Override
  public void update(K key, U update) {
    throw new SamzaException("Cache tables do not support update operations");
  }
Simple cache table backed by a Guava cache instance. Application is expect to build
a cache instance with desired parameters and specify it to the table descriptor.

@param <K> type of the key in the cache
@param <V> type of the value in the cache
samza-core/src/main/java/org/apache/samza/table/caching/guava/GuavaCacheTable.java