Compatibility Changes in MongoDB 7.2
On this page
Important
MongoDB 8.1 is a rapid release and is only supported for MongoDB Atlas. MongoDB 8.1 is not supported for use on-premises. For more information, see MongoDB Versioning.
Backward-Incompatible Features
Aggregation on Unsharded Collections
Starting in MongoDB 7.2, the output of
explain().aggregate()
on sharded clusters is the same for both sharded
and unsharded collections. The output is under the shards field.
General Changes
serverStatus Metrics
Starting in MongoDB 7.2, the serverStatus command and the
db.serverStatus() method have these output changes:
Renamed Metrics
query.planCacheTotalQueryShapesis nowplanCache.totalQueryShapesquery.planCacheTotalSizeEstimateBytesis nowplanCache.totalSizeEstimateBytes
wiredTiger Storage Engine Encryption Specification
Starting in MongoDB 7.2, you can't specify wiredTiger storage
engine encryption options when you create a collection with
db.createCollection(). To configure encryption for
the WiredTiger storage engine, see Encryption at Rest.
routingTableCacheChunkBucketSize Must Be Greater Than 0
Starting in MongoDB 7.2, the
routingTableCacheChunkBucketSize parameter's value must be
greater than 0. Previously, this value could equal to 0.