@After public void tearDown() {
    if (msClient != null) {
      msClient.close();
    }
    if (driver != null) {
      driver.close();
    }
    conf = null;
  }
Superclass for Test[Crud|Mm]CompactorOnTez, for setup and helper classes.
itests/hive-unit/src/test/java/org/apache/hadoop/hive/ql/txn/compactor/CompactorOnTezTest.java