用户通过Round-robin的方式调用Leaf Server的各个服务
+-------------+--------------+------+-----+-------------------+-----------------------------+
| Field | Type | Null | Key | Default | Extra |
+-------------+--------------+------+-----+-------------------+-----------------------------+
| biz_tag | varchar(128) | NO | PRI | | |
| max_id | bigint(20) | NO | | 1 | |
| step | int(11) | NO | | NULL | |
| desc | varchar(256) | YES | | NULL | |
| update_time | timestamp | NO | | CURRENT_TIMESTAMP | on update CURRENT_TIMESTAMP |
+-------------+--------------+------+-----+-------------------+-----------------------------+出现的问题：
- 更新db，耗时尖刺
- db本身，主从切换什么的
双buffer优化
leaf snowflake部分
我们平常讲的完全自己生成ID
