private String getFileInfoString(File file) {
    String[] splittedStr = file.getAbsolutePath().split(File.separator.equals("\\") ? "\\\\" : "/");
    int length = splittedStr.length;
    return splittedStr[length - SnapshotLogger.FILE_NAME_OFFSET]
        + SnapshotLogger.SPLIT_CHAR
        + splittedStr[length - SnapshotLogger.TIME_PARTITION_OFFSET]
        + SnapshotLogger.SPLIT_CHAR
        + splittedStr[length - SnapshotLogger.SEQUENCE_OFFSET];
  }
1. Clear origin data 2. Move snapshot data to data dir 3. Load data region

@return
iotdb-core/datanode/src/main/java/org/apache/iotdb/db/storageengine/dataregion/snapshot/SnapshotLoader.java