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Informations about the package ali-opensearch-sdk
ali-opensearch-sdk
应用层，基于 laravel scout 实现：https://laravel.com/docs/5.4/scout#custom-engines
scout 默认引擎是 algolia：https://www.algolia.com
开源的，大家常用 Elasticsearch：https://laracasts.com/discuss/channels/general-discussion/looking-for-a-search-engine-for-my-laravel-app?page=1
阿里云有开放搜索服务：https://help.aliyun.com/document_detail/29104.html?spm=5176.doc35261.6.539.qrzcjR
看文档相比自己搭 Elasticsearch 有以下优势：
- 不用买服务器、搭环境、主从、容灾、维护...这是最重要的原因（实际上看似开放搜索要收费，当时算上人工和服务器成本，自己搭建基础服务贵太多了）
- 开放搜索可以从 RDS 自动同步数据，这样就不用在应用里做数据同步了（实际上，对灵析来说，因为既有 laravel 又有 tp，要做好数据同步非常麻烦）
- 据称，开放搜索比 ElasticSearch 开源系统的QPS高4倍，查询延迟低4倍
安装
配置
在你的 scout.php
注册服务
使用
请先阅读：https://laravel.com/docs/5.3/scout
在 Model 里添加 Searchable Trait：
开始使用：
简单搜索
更为复杂的情况就是对搜索添加的构造，仿照 laravel model/builder 的思想写了一个对 Opensearch 的 查询构造器.
根据条件动态的搜索, 基本和 eloquent 提供的数据库查询保持一致.
数据的维护
有很多情况可能无法直接使用 opensearch 直接同步 RDS 的数据，那么就需要在应用用去手动维护。
这个时候实现 toSearchableDocCallbacks 这个方法，向 opensearch 提供删除，修改的数据。
使用可以先阅读源码，有详细的注释，这边还没有想出最佳实践。
All versions of ali-opensearch-sdk with dependencies
laravel/scout Version ~2.0 || ~3.0
illuminate/events Version ~5.1
illuminate/contracts Version ~5.1