How to Manage mgo.v2 Sessions Concurrently in Go Web Applications?

Concurrency in mgo.v2: Session Management

In Go web applications that employ MongoDB via the mgo.v2 package, a pivotal question arises: how to manage mgo.Session instances concurrently.

mgo.Session Concurrency

The mgo.Session is stated as concurrency-safe, allowing access from multiple goroutines. However, this does not negate the potential benefits of using multiple sessions.

Advantages of Multiple Sessions

Sessions internally manage connection pools, enabling connections to multiple server nodes. Utilizing multiple sessions allows for better resource utilization and faster response times.

Recommended Approach

To optimize concurrency, it's advisable to:

1. Create a new mgo.Session at the beginning of each request.
2. Utilized defer to ensure proper session cleanup (Session.Close()).

This practice leverages connection pooling effectively, allowing for simultaneous connections to multiple server nodes, thereby improving performance and scalability.

Additional Considerations

Refer to the related question for further insights into session usage: mgo - query performance seems consistently slow (500-650ms).

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