private boolean containsRowWithKey(Table table, String rowKey) throws IOException {
    byte[] data = Bytes.toBytes(rowKey);
    Get get = new Get(data);
    Result result = table.get(get);
    return result.containsColumn(famName, qualName);
  }
This test checks whether backups properly track & manage bulk files loads.
hbase-backup/src/test/java/org/apache/hadoop/hbase/backup/TestIncrementalBackupWithBulkLoad.java