@Override
  public void close() {
    // The KV store is not closed here as it may still be needed by downstream operators,
    // it will be closed by the SamzaContainer
  }
Refer to {@link KeyValueStore#all()}

@return an iterator for all entries in this key-value store.
samza-kv/src/main/java/org/apache/samza/storage/kv/LocalTable.java