@Test
  public void testMROnTable() throws Exception {
    final TableName tableName = TableName.valueOf(name.getMethodName() + util.getRandomUUID());

    // Prepare the arguments required for the test.
    String[] args = new String[] {
      "-D" + ImportTsv.MAPPER_CONF_KEY
        + "=org.apache.hadoop.hbase.mapreduce.TsvImporterCustomTestMapperForOprAttr",
      "-D" + ImportTsv.COLUMNS_CONF_KEY + "=HBASE_ROW_KEY,FAM:A,FAM:B,HBASE_ATTRIBUTES_KEY",
      "-D" + ImportTsv.SEPARATOR_CONF_KEY + "=\u001b", tableName.getNameAsString() };
    String data = "KEY\u001bVALUE1\u001bVALUE2\u001btest=>myvalue\n";
    util.createTable(tableName, FAMILY);
    doMROnTableTest(util, FAMILY, data, args, 1, true);
    util.deleteTable(tableName);
  }
Force use of combiner in doMROnTableTest. Boolean. Default is true.
hbase-mapreduce/src/test/java/org/apache/hadoop/hbase/mapreduce/TestImportTSVWithOperationAttributes.java