@AfterClass
  public static void afterClass() throws Exception {
    UTIL.shutdownMiniCluster();
  }
Test Map/Reduce job over HBase tables. The map/reduce process we're testing on our tables is
simple - take every row in the table, reverse the value of a particular cell, and write it back
to the table.
hbase-mapreduce/src/test/java/org/apache/hadoop/hbase/mapreduce/TestMultithreadedTableMapper.java