6.10.1 (2024-11-27)
The MongoDB Node.js team is pleased to announce version 6.10.1 of the bson package!
Release Notes
Fix issue with the internal unbounded type cache
As an optimization, a previous performance improvement stored the type information of seen objects to avoid recalculating type information. This caused an issue in the driver under extreme load and high memory usage as the cache grew. The assumption was that garbage collection would clear it enough to sustain normal operation. The cache is now removed and other optimal type checking is used in its place.
Cache the hex string of an ObjectId lazily
When ObjectId.cacheHexString is set to true we no longer convert the buffer to a hex string in the constructor, since the cache is already being filled in any call to objectid.toHexString().
Additionally, if a string is passed into the constructor we can cache this immediately as there is no performance impact and no extra memory that needs to be allocated.
This improves the performance for situations where you are parsing ObjectIds from a string (ex. JSON) and want to avoid recalculating the hex. It also improves situations where you have ObjectIds coming from BSON and only convert some of them strings perhaps after applying some filter to eliminate some.
With cacheHexString enabled deserializing ObjectIds from BSON shows ~80% performance improvement and toString-ing ObjectIds that were constructed from a string convert ~40% faster!
Thanks to @SeanReece for contributing this improvement!
Bug Fixes
Performance Improvements
Documentation
We invite you to try the bson library immediately, and report any issues to the NODE project.