November 2021
Beginner to intermediate
239 pages
4h 15m
Chinese
Content preview from Dapr学习手册
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94
｜
第
2
章
来处理。支持事务性存储接口的存储称为事务性状态存储。
actor
编程模型的
支持需要事务性状态存储（详见第
5
章）。
2.2.4
多状态存储
Dapr
支持同一集群上的多个状态存储。每个存储都由存储名称来标识，并
被配置为
Dapr
组件。例如，当编写数字音乐库时，可以将专辑信息保存到
Cosmos DB
中，并将实际的音频文件保存在
blob
存储中。在编写本书时，
Dapr
不支持跨多个状态存储的事务。应用程序应该使用单一的状态存储作为
单一的真实来源，并使用其他存储保存相关数据。
2.2.5
重试策略
Dapr
提供简单的重试库，可以根据线性重试策略或指数回退重试策略自动重
试失败的操作
译注
1
。重试策略支持配置时间间隔
(interval)
和最大阈值。在给
定的时间间隔内重试数据操作，直到达到最大重试阈值。线性重试策略有固
定的时间间隔。指数回退策略具有指数级增加的间隔，定义为
interval
i
=
初
始间隔 ×
2
i
，其中
interval
i
是数据操作第
i
次尝试后的间隔。
2.3 Dapr State API
Dapr
定义了一个基于
key/value
范式的简单的状态
API
，如下面的代码片段所
示：
type Store interface {
Init(metadata Metadata) error
Delete(req *DeleteRequest) error
BulkDelete(req []DeleteRequest) error
Get(req *GetRequest) (*GetResponse, ...
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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.