@Override
            public CompletableFuture<HRegionLocation> answer(InvocationOnMock invocation)
              throws Throwable {
              TableName tableName = invocation.getArgument(0);
              RegionInfo info = RegionInfoBuilder.newBuilder(tableName).build();
              ServerName serverName = ServerName.valueOf("rs", 16010, 12345);
              HRegionLocation loc = new HRegionLocation(info, serverName);
              return CompletableFuture.completedFuture(loc);
            }
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