@Test
  public void testDryModeWithoutBulkOutputAndTableExists() throws Exception {
    util.createTable(tn, FAMILY);
    args.put(ImportTsv.DRY_RUN_CONF_KEY, "true");
    doMROnTableTest(null, 1);
    // Dry mode should not delete an existing table. If it's not present,
    // this will throw TableNotFoundException.
    util.deleteTable(tn);
  }
Force use of combiner in doMROnTableTest. Boolean. Default is true.
hbase-mapreduce/src/test/java/org/apache/hadoop/hbase/mapreduce/TestImportTsv.java