@Test
  public void testRowCounterExclusiveColumn() throws Exception {
    String[] args = new String[] { TABLE_NAME, COL_FAM + ":" + COL1 };
    runRowCount(args, 8);
  }
Test a case when the column specified in command line arguments is exclusive for few rows.
hbase-mapreduce/src/test/java/org/apache/hadoop/hbase/mapreduce/TestRowCounter.java