Great questions—let’s break this down clearly for you:

1. Is MongoDB 4.2 a newly released stable version? #

Yes, it is. MongoDB follows a consistent versioning rule where even-numbered major/minor versions (like 4.2, 4.0) are designated as stable production-ready releases, while odd-numbered versions are development/preview builds meant for testing new features.

MongoDB 4.2.0 is the first stable release of the 4.2 series, officially succeeding the 4.0.x branch you’re currently running (4.0.12). It’s gone through MongoDB’s full stable release testing cycle, including community feedback and bug fixes from pre-release iterations, so it’s a legitimate, supported stable update.

2. Should you start using MongoDB 4.2? #

This depends entirely on your environment:

• Test environments or new projects: Go for it! The 4.2 series introduces impactful improvements like enhanced multi-document transactions, more powerful aggregation pipeline tools, query performance optimizations, and better security features. It’s a great opportunity to experiment with these upgrades and align new projects with the latest stable standard.
• Production environments: Wait for a minor patch release (like 4.2.1 or 4.2.2). First stable releases in a new branch sometimes have edge-case bugs that get ironed out in subsequent patches. Waiting a bit lets the community and MongoDB’s team catch and fix these issues, ensuring a smoother, lower-risk production rollout.

If you do choose to test or upgrade, keep these steps in mind:

• Confirm your database drivers are compatible with MongoDB 4.2 (older drivers may not support all new features)
• Take a full backup of your 4.0.12 deployment before attempting any upgrade
• Run thorough compatibility tests for your application to check for deprecated features you might rely on

Your custom build setup is ideal for spinning up test instances to evaluate 4.2 without risking your production systems—definitely use that to validate how it works with your workflow!

内容的提问来源于stack exchange，提问作者Patrik Laszlo