private ShowCompactResponse initiateAndVerifyCompactionQueueLength(int expectedLength)
      throws Exception {
    startInitiator();
    ShowCompactResponse rsp = txnHandler.showCompact(new ShowCompactRequest());
    Assert.assertEquals(expectedLength, rsp.getCompactsSize());
    return rsp;
  }
Test that HiveConf.ConfVars.HIVE_COMPACTOR_ABORTEDTXN_TIME_THRESHOLD triggers compaction.

@throws Exception
ql/src/test/org/apache/hadoop/hive/ql/txn/compactor/TestInitiator.java