November 2021
Beginner to intermediate
239 pages
4h 15m
Chinese
Content preview from Dapr学习手册
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100
｜
第
2
章
聚合
API
注
2
。一些讨论过的语言
/
协议包括
T-SQL
、
oData
和
GraphQL
，但
在本文撰写时，团队还没有确定方向。然而，
Dapr
的状态存储设计的一个好
处是，它不使用专有的状态格式。你可以直接在后台状态存储上操作以实现
复杂的查询和聚合。
对后台存储的只读访问一般是安全的。但是直接通过状态存储来改变数据可
能是危险的。你的代码需要以
Dapr
维护
ETags
的方式来维护
ETags
，否则
Dapr
可能会感到困惑并拒绝合法的更新请求。建议在后端存储上应用适当的
RBAC
，以避免来自未经授权的应用程序或用户的意外更新。
2.5
状态存储
Dapr
最初提供了两个状态存储：
Redis
和
Azure Cosmos DB
。自最初发布以来，
社区已经贡献了许多其他状态存储，包括：
• HashiCorp
。
• Consul
。
• Etcd
。
• Cassandra
。
• Memcached
。
• MongoDB
。
• ZooKeeper
。
• Google Cloud
。
• FirestoreAWS
。
• DynamoDB
。
• Couchbase
。
在本文编写时，更多的状态存储正在开发中。本节提供了一些可用的状态存
注
2
：
在撰写本书时，我们正在添加一个批量获取的新
API
，以允许在单个请求中检索多个键。
Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
and much more.
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.