public KeyValueSnapshot<K, V> snapshot(K from, K to) {
    return kvStore.snapshot(from, to);
  }
Refer to {@link KeyValueStore#snapshot(Object, Object)}

@param from the key specifying the low endpoint (inclusive) of the keys in the returned range.
@param to the key specifying the high endpoint (exclusive) of the keys in the returned range.
@return a snapshot for the specified key range.
@throws NullPointerException if null is used for {@code from} or {@code to}.
samza-kv/src/main/java/org/apache/samza/storage/kv/LocalTable.java