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Khaled Pendleton
20,430 PointsHow to handle a MongoDB crash?
I'm building an ExpressJS API with Mongo/Mongoose. If my app successfully connects to Mongo but at a later time loses its connection for whatever reason, how do I: 1) Figure this out as soon as it fails 2) Re-establish the connection 3) Figure out how it failed in the first place
1 Answer
Ken Alger
Treehouse TeacherKhaled;
This is not a unique thing to MongoDB as it could happen with any external functionality, service, or API, right? SQL Server connections, web API, etc. could all become unresponsive or unreachable.
So to address your questions:
- In your application you will want to, typically, make connections and CRUD operations to your data store (regardless of technology) inside some form of try... catch statement.
- Reestablishing a connection might very well be outside your control and would likely need to vary depending on your particular application.
- Again, figuring out the why might be something well beyond your control. What if the database server crashed? What if a user's cat unplugged their network connection? MongoDB (and most databases) will have log files available for examination but that is likely beyond the scope of of the application developer specifically.
Post back if you have further questions.