little-cui opened a new pull request #1180:
URL: https://github.com/apache/servicecomb-service-center/pull/1180
### 背景
当前契约是按照微服务版本一比一存储的，当升级微服务版本，较多场景下会冗余schema存储，导致后端数据存储暴涨
### 实现方式
- hash：使用md5算法hash文件名与内容（要做接口抽象，以便后续切换算法），算出每个契约文件的“地址”，将地址作为etcd
key，内容作为etcd value存储，不要做全量缓存，会把内存挤爆的，为了优化查询速度，只能做热点查询，比如就留1000size的契约缓存。
- 缓存：可以缓存{serviceid}/{schemaid}到hash(schemaid+schemacontent)的映射进行加速
- 存储结构：/cse-sr/ms/schema-content/{domain}/{project}/{schema_hash}，值为契约名字和内容
- 汇总查询：service的schemas slice应该存的是这些地址，需要汇总时，再进行关联查询
### 老数据兼容、老接口兼容的总原则
- 新老数据共存
- 不增API
- 允许一个微服务版本部分schema是老逻辑，部分是新逻辑
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