private void registerCleanupTaskExecutor() {
    PipeDataNodeAgent.runtime()
        .registerPeriodicalJob(
            "LoadTsFileManager#cleanupTasks",
            this::cleanupTasks,
            CONFIG.getLoadCleanupTaskExecutionDelayTimeSeconds() >> 2);
  }
{@link LoadTsFileManager} is used for dealing with {@link LoadTsFilePieceNode} and {@link
LoadCommand}. This class turn the content of a piece of loading TsFile into a new TsFile. When
DataNode finish transfer pieces, this class will flush all TsFile and load them into IoTDB, or
delete all.
iotdb-core/datanode/src/main/java/org/apache/iotdb/db/storageengine/load/LoadTsFileManager.java