@Test
  public void testCreateMetaTable() {
    conn.getAdmin().createTable(TableDescriptorBuilder.newBuilder(TableName.META_TABLE_NAME)
      .setColumnFamily(ColumnFamilyDescriptorBuilder.of("cf")).build()).join();
    verify(masterStub, times(1)).createTable(assertPriority(SYSTEMTABLE_QOS),
      any(CreateTableRequest.class), any());
  }
Confirm that we will set the priority in {@link HBaseRpcController} for several admin operations.
hbase-client/src/test/java/org/apache/hadoop/hbase/client/TestAsyncAdminRpcPriority.java