mycat2.0 分库分表报错 3002 - ERROR-CODE: [MYCAT-3002][ERR_FETCH_METADATA] MetadataManager init fail

1.安装好mycat2.0之后，执行sql进行分库分表

DROP TABLE `sys_user`;
CREATE TABLE `sys_user`  (
  `id` bigint(0) NOT NULL AUTO_INCREMENT COMMENT 'id',
  `username` varchar(32) NULL COMMENT '用户名',
  `password` varchar(32) NULL COMMENT '密码',
  PRIMARY KEY (`id`),
	 KEY `id` (`id`)
) ENGINE=InnoDB  DEFAULT CHARSET=utf8 dbpartition by mod_hash(id) tbpartition by mod_hash(id) tbpartitions 2 dbpartitions 2;

报错 3002 - ERROR-CODE: [MYCAT-3002][ERR_FETCH_METADATA] MetadataManager init fail

 2.经过一天的消磨，百度，gpt，csdn之后，终于找到原因，没有数据源

-- 创建数据源
/*+ mycat:createDataSource{
"name":"dr",
"url":"jdbc:mysql://xxxxx:3308/mysql",
"user":"root",
"password":"111111"
} */;