protected void deleteBulkLoadDirectory() throws IOException {
    // delete original bulk load directory on method exit
    Path path = getBulkOutputDir();
    FileSystem fs = FileSystem.get(path.toUri(), conf);
    boolean result = fs.delete(path, true);
    if (!result) {
      LOG.warn("Could not delete " + path);
    }
  }
@throws IOException                   If the execution of the backup fails
@throws ColumnFamilyMismatchException If the column families of the current table do not match
                                      the column families for the last full backup. In which
                                      case, a full backup should be taken
hbase-backup/src/main/java/org/apache/hadoop/hbase/backup/impl/IncrementalTableBackupClient.java