@Nullable
  static byte[] getDictionary(final Configuration conf) {
    String path = conf.get(ZSTD_DICTIONARY_KEY);
    return DictionaryCache.getDictionary(conf, path);
  }
Hadoop ZStandard codec implemented with zstd-jni.
<p>
This is data format compatible with Hadoop's native ZStandard codec.
hbase-compression/hbase-compression-zstd/src/main/java/org/apache/hadoop/hbase/io/compress/zstd/ZstdCodec.java