@After
  public void tearDown() throws Throwable {
    primary.run("drop database if exists " + extraPrimaryDb + " cascade");
    super.tearDown();
  }
TestMetadataReplicationScenariosExternalTables - Test metadata only replication.
for external tables.
itests/hive-unit/src/test/java/org/apache/hadoop/hive/ql/parse/TestReplicationScenariosExternalTablesMetaDataOnly.java