@After
  public void after() throws Exception {
    if (driver != null) {
      driver.close();
    }
    TestTxnDbUtil.cleanDb(baseConf);
  }
Test class for running queries using HBase tables. Creates a mini ZK and an HBase test cluster.
Each test method must instantiate a driver object first, using either the baseConf or a modified version of that.
Once finished, each test method must take care of cleaning up any database objects they've created (tables,
databases, etc.), otherwise those will be visible for subsequent test methods too.
hbase-handler/src/test/org/apache/hadoop/hive/hbase/TestHBaseQueries.java