@Override
      public Void call() throws Exception {
        TableDescriptorBuilder tableDescriptorBuilder =
          TableDescriptorBuilder.newBuilder(TableName.valueOf("non_existing_namespace", "table1"));
        ColumnFamilyDescriptor columnFamilyDescriptor =
          ColumnFamilyDescriptorBuilder.newBuilder(Bytes.toBytes("family1")).build();
        tableDescriptorBuilder.setColumnFamily(columnFamilyDescriptor);
        admin.createTable(tableDescriptorBuilder.build()).join();
        return null;
      }
Class to test asynchronous namespace admin operations.
hbase-server/src/test/java/org/apache/hadoop/hbase/client/TestAsyncNamespaceAdminApi.java