Important
MongoDB 8.2 is the latest minor release. Starting with MongoDB 8.2, minor releases are available for on-premises deployments (Community and EA) for specific use cases. For more information, see MongoDB Versioning.
To install the latest MongoDB version supported for on-premises use, see the installation instructions.
Backward-Incompatible Features
General Changes
$$CLUSTER_TIME Errors on Standalone Deployments
Starting in MongoDB 8.2, if you try to use the CLUSTER_TIME
variable in a standalone deployment, the server returns an error.
$rankFusion on Views
Starting in MongoDB 8.2, $rankFusion can now run on views.
For more information, see $rankFusion.
orphanCleanupDelaySecs Change
Starting in MongoDB 8.2, the default value of orphanCleanupDelaySecs
is 3600 (previously 900).
Remaining Resharding Time Threshold Change
Starting in MongoDB 8.2 (also available in 8.1.2 and 8.0.13), resharding enters the critical section when the estimated time to complete the remaining work is 500 ms or less.
$cpuNanos Change
Starting in MongoDB 8.2, cpuNanos is located in the $queryStats
aggregation stage metrics and includes additional metrics related to CPU usage for query operations.
The cpuNanos metric is only available on Linux systems.
In earlier versions, cpuNanos was located in operationMetrics.
Removed Parameters
MongoDB 8.2 removes the catalogCacheIndexMaxEntries parameter.