@Test
  public void testMultithreadedTableMapper()
    throws IOException, InterruptedException, ClassNotFoundException {
    runTestOnTable(UTIL.getConnection().getTable(MULTI_REGION_TABLE_NAME));
  }
Test multithreadedTableMappper map/reduce against a multi-region table
hbase-mapreduce/src/test/java/org/apache/hadoop/hbase/mapreduce/TestMultithreadedTableMapper.java