@Test
  public void testBulkOutputWithTsvImporterTextMapper() throws Exception {
    Path bulkOutputPath = new Path(util.getDataTestDirOnTestFS(tn.getNameAsString()), "hfiles");
    args.put(ImportTsv.MAPPER_CONF_KEY, "org.apache.hadoop.hbase.mapreduce.TsvImporterTextMapper");
    args.put(ImportTsv.BULK_OUTPUT_CONF_KEY, bulkOutputPath.toString());
    String data = "KEY\u001bVALUE4\u001bVALUE8\n";
    doMROnTableTest(data, 4);
    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