public synchronized void commit() throws IOException {
    // all dirty pages had been flushed correctly, entries before this is disposable now
    write(COMMIT_MARK);
    force();
  }
A specialisation of {@linkplain SchemaLogWriter} for integrity of SchemaFile, acting like a redo
log as in InnoDB.
iotdb-core/datanode/src/main/java/org/apache/iotdb/db/schemaengine/schemaregion/mtree/impl/pbtree/schemafile/log/SchemaFileLogWriter.java