@AfterClass
  public static void tearDownAfterClass() throws Exception {
    htable3.close();
    TestReplicationBase.tearDownAfterClass();
  }
recompareSleep is set to exceed how long we wait on
{@link VerifyReplication#reCompareExecutor} termination when doing cleanup. this allows us to
test the counter-incrementing logic if the executor still hasn't terminated after the call to
shutdown and awaitTermination
hbase-mapreduce/src/test/java/org/apache/hadoop/hbase/replication/VerifyReplicationTestBase.java