CODEWITHSUNDEEP
javamongodb
Michael
Michael

Reputation: 42050

Which Mongo instance in Replica Set did the application call?

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

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.

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

How can I do that ?

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

Upvotes: 1

Views: 108

Answers (1)

evanchooly
evanchooly

Reputation: 6233

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

Upvotes: 2

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