private void init() {
    this.bufferSize = getBufferSize(conf);
    this.level = getLevel(conf);
    this.dictionary = getDictionary(conf);
  }
Returns dictionary and its ID number, useful for comparing to other dictionaries for equality
hbase-compression/hbase-compression-zstd/src/main/java/org/apache/hadoop/hbase/io/compress/zstd/ZstdCodec.java