public Runnable executeCompactFileTimeIndexCache() {
    return () -> {
      if (!isReadyForNonReadWriteFunctions()) {
        return;
      }
      for (DataRegion dataRegion : dataRegionMap.values()) {
        if (dataRegion != null) {
          dataRegion.compactFileTimeIndexCache();
        }
      }
    };
  }
reboot timed flush sequence/unsequence memtable thread
iotdb-core/datanode/src/main/java/org/apache/iotdb/db/storageengine/StorageEngine.java