@Override
  public void putAll(List<Entry<byte[], byte[]>> entries) {
    // TreeMap's putAll requires a map, so we'd need to iterate over all the entries anyway
    // to use it, in order to putAll here.  Therefore, just iterate here.
    for (Entry<byte[], byte[]> next : entries) {
      put(next.getKey(), next.getValue());
    }
  }
@param metrics A metrics instance to publish key-value store related statistics
samza-kv-inmemory/src/main/java/org/apache/samza/storage/kv/inmemory/InMemoryKeyValueStore.java