v6.4.0
6.4.0 (2024-02-29)
The MongoDB Node.js team is pleased to announce version 6.4.0 of the bson package!
Release Notes
BSON short basic latin string writing performance improved!
The BSON library's string encoding logic now attempts to optimize for basic latin (ASCII) characters. This will apply to both BSON keys and BSON values that are or contain strings. If strings are less than 6 bytes we observed approximately 100% increase in speed while around 24 bytes the performance was about 33% better. For any non-basic latin bytes or at 25 bytes or greater the BSON library will continue to use Node.js' Buffer.toString API.
The intent is to generally target the serialization of BSON keys which are often short and only use basic latin.
Fixed objectId symbol property not defined on instances from cross cjs and mjs
We do recommend that users of the driver use the BSON APIs exported from the driver. One reason for this is at this time the driver is only shipped in commonjs format and as a result it will only import the commonjs BSON bundle. If in your application you use import syntax then there will be a commonjs and an es module instance in the current process which prevents things like instanceof from working.
Also, private symbols defined in one package will not be equal to symbols defined in the other. This caused an issue on ObjectId's private symbol property preventing the .equals method from one package from operating on an ObjectId created from another.
Thanks to @dot-i's contribution we've changed the private symbol to a private string property so that the .equals() method works across module types.
Deserialization performance increased
If BSON data does not contain Doubles and UTF8 validation is disabled the deserializer is careful to not allocate data structures needed to support that functionality. This has shown to greatly increase (2x-1.3x) the performance of the deserializer.
Thank you @billouboq for this contribution!
Improve the performance of small byte copies
When serializing ObjectIds, Decimal128, and UUID values we can get better performance by writing the byte-copying logic in Javascript for loops rather than using the TypedArray.set API. ObjectId serialization performance is 1.5x-2x faster.
Improved the performance of serializing and deserializing doubles and bigints
We now use bit shifting and multiplication operators in place of DataView getX/setX calls to parse and serialize bigints and a Float64Array to convert a double to bytes. This change has been shown to increase deserializing performance ~1.3x and serializing performance ~1.75x.
Use allocUnsafe for ObjectIds and Decimal128
For small allocations Node.js performance can be improved by using pre-allocated pooled memory. ObjectIds and Decimal128 instance will now use allocUnsafe on Node.js.
Features
Bug Fixes
- NODE-5873: objectId symbol property not defined on instances from cross cjs and mjs (#643) (4d9884d)
Performance Improvements
- NODE-5557: move DataView and Set allocation used for double parsing and utf8 validation to nested path (#611) (9a150e1)
- NODE-5910: optimize small byte copies (#651) (24d035e)
- NODE-5934: replace DataView uses with bit math (#649) (6d343ab)
- NODE-5955: use pooled memory when possible (#653) (78c4264)
Documentation
We invite you to try the bson library immediately, and report any issues to the NODE project.
