Menu
I know Mongo Java driver will retry collection.find(), and most other read operations, per Mongo docs.
But I can't see anywhere in docs or in the driver source - will it retry DBCursor.next() or DBCursor.hasNext()?
482
The MongoDB Driver mongodb-driver-sync is the synchronous Java driver containing only the generic MongoCollection interface that complies with a new cross-driver CRUD specification. It does not include the legacy API (e.g. DBCollection ).
To interact with MongoDB from our Java application, we will use a piece of software called the Java Driver, which is an official and recommended MongoDB driver application for the Java language.
To connect: MongoClient client = MongoClients. create("<<MongoDB URI>>"); To connect to MongoDB on your local instance and default port, you can just omit the URI part of the above, or use a URI like 'mongodb://localhost:27017'.
No, it will not retry cursor based reads.
Cursor.getMore() cannot be retried because of the inability for the client to discern if the cursor was advanced. In other words, since the driver does not know if the original getMore() succeeded or not, the driver cannot reliably know if results might be inadvertently skipped.
More details here - https://github.com/mongodb/specifications/blob/master/source/retryable-reads/retryable-reads.rst#implementing-retryable-reads
175
If you love us? You can donate to us via Paypal or buy me a coffee so we can maintain and grow! Thank you!
Donate Us With
