应用程序调用了副本集中的哪个 Mongo 实例? [英] Which Mongo instance in Replica Set did the application call?

问题描述

我有一个 Java 应用程序，它与 Mongo 副本集 配合使用.副本集由不同主机上的两个 Mongo 实例(primary 和 secondary)组成

I have a Java application, which works with a Mongo replica set. The replica set consists of two Mongo instances (primary and secondary) in different hosts

假设应用程序正在执行查询(例如在集合中查找文档).我不知道它使用什么阅读偏好.还假设 primary 和 secondary 实例存储相同的数据.

Suppose the application is executing a query (e.g. find a document in a collection). I don't know what read preference it uses. Suppose also that both primary and secondary instances store the same data.

现在我需要知道应用程序调用了哪个 Mongo 实例来执行查询:primary、secondary 或两者.

Now I need to know which Mongo instance the application has called to execute the query: the primary, the secondary, or the both.

我该怎么做?

我更喜欢不需要访问应用程序代码的解决方案.

I would prefer a solution, which does not require access to the application code.

推荐答案

默认的阅读偏好是主要的，所以如果你没有改变它，它就是阅读的地方.

The default read preference is primary so if you didn't change it, that's where it's reading.

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