@Test
  public void testBatchMetaTable() {
    conn.getTable(TableName.META_TABLE_NAME).batchAll(Arrays.asList(new Delete(Bytes.toBytes(0))))
      .join();
    verify(stub, times(1)).multi(assertPriority(SYSTEMTABLE_QOS),
      any(ClientProtos.MultiRequest.class), any());
  }
Confirm that we will set the priority in {@link HBaseRpcController} for several table operations.
hbase-client/src/test/java/org/apache/hadoop/hbase/client/TestAsyncTableRpcPriority.java