private void flushDirtyPagesWithoutLogging(List<ISchemaPage> dirtyPages) throws IOException {
    for (ISchemaPage page : dirtyPages) {
      page.syncPageBuffer();
      page.flushPageToChannel(channel);
    }
  }
Load bytes from log, deserialize and flush directly into channel, return current length
iotdb-core/datanode/src/main/java/org/apache/iotdb/db/schemaengine/schemaregion/mtree/impl/pbtree/schemafile/pagemgr/PageIOChannel.java