public void deserialize(InputStream inputStream) throws IOException {
    this.checkPoint = ReadWriteIOUtils.readLong(inputStream);
  }
The data structure of the MLog description file.

<ul>
  <li>1 long (8 bytes): check point of MLog started from 0, which means that MLog entries with
      offset less than the checkpoint do not need to be redone
</ul>
iotdb-core/datanode/src/main/java/org/apache/iotdb/db/schemaengine/schemaregion/logfile/MLogDescription.java