问题描述
作为文档(https://docs.mongodb.com/manual/changeStreams/) 说，我们可以使用 resumeToken 从 MongoDB 恢复获取事件.
As document(https://docs.mongodb.com/manual/changeStreams/) says, we can resume to get event from MongoDB using resumeToken.
我会将最近的 resumeToken 存储到公共存储中，但我不确定此简历令牌是否在全球范围内唯一.我想知道它对于整个系列或每个系列都是独一无二的.
I will store recent resumeToken to common storage, but I'm not sure whether this resume token is unique globally or not.I want to know it's unique for whole collections or each collection.
它似乎使用了 UUID (https://github.com/mongodb/mongo/blob/master/src/mongo/db/pipeline/resume_token.h#L61)..
It seems to use UUID (https://github.com/mongodb/mongo/blob/master/src/mongo/db/pipeline/resume_token.h#L61)..
谢谢
推荐答案
resumeToken 在单个 MongoDB 部署集群中是唯一的.MongoDB 更改流使用全局逻辑时钟.服务器将集群时间编码为 resumeToken 的前缀值，从而可以按照收到的顺序安全地解释变更流通知.
The resumeToken is unique within a single MongoDB deployment cluster. MongoDB change streams utilise a global logical clock. The server encodes the cluster time as the prefix value of a resumeToken, resulting in change streams notifications can be safely interpreted in the order received.
从 MongoDB v4.0 开始，您可以为部署打开更改流游标，以监视所有数据库中所有非系统集合的更改，除了 admin、local 和 config.
Starting from MongoDB v4.0, you can open a change stream cursor for a deployment to watch for changes to all non-system collections across all databases except for admin, local, and config.
这篇关于MongoDB ChangeStream ResumeToken 是全球唯一的吗?的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！