@Override
  public int getChunkId() {
    // The chunkId is embedded at the 0th offset of the bytebuffer
    return ByteBufferUtils.toInt(buf, 0);
  }
ByteBuffer based cell which has the chunkid at the 0th offset and with no tags
@see MemStoreLAB
hbase-server/src/main/java/org/apache/hadoop/hbase/regionserver/NoTagByteBufferChunkKeyValue.java