Release Notes for MongoDB 6.3
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MongoDB 6.3 is a rapid release and is only supported for MongoDB Atlas. MongoDB 6.3 is not supported for use on-premises. For more information, see MongoDB Versioning.
To install the latest MongoDB version supported for on-premises use, MongoDB 6.0, see the MongoDB 6.0 installation instructions.
Patch Releases
6.3.2 - June 29, 2023
Issues fixed:
- SERVER-67105
$in queries do not use clustered index - SERVER-69952 Filtering on dates outside of the 32 bit epoch range returns wrong results
- SERVER-74380 Router role retry loop should allow namespaces different from the one it was created for
- SERVER-76550 Balancer is unable to drain shards with big chunks
- SERVER-77018 Deadlock between dbStats and 2 index builds
- All JIRA issues closed in 6.3.2
- 6.3.2 Changelog
6.3.1 - May 3, 2023
Issues fixed:
- SERVER-71636 Explain executionStats does not work for $lookup on sharded collection
- SERVER-73229 Logical sessions cache refresh ignores write errors from updating session document, leading to cursors being killed early
- SERVER-73482 $natural hint overrides sort on clustered collections
- SERVER-74131 Multiplanning together with subplanning causes server crash in mapReduce queries
- SERVER-75277 TTL deleter attributes resource metrics across multiple databases
- All JIRA issues closed in 6.3.1
- 6.3.1 Changelog
Aggregation
New Aggregation Operators
MongoDB 6.3 introduces the following aggregation operators:
| Operator | Description |
|---|---|
$bitAnd | Returns the result of a bitwise and operation on an array of int or long values. |
$bitNot | Returns the result of a bitwise not operation on a single argument or an array that contains a single int or long value. |
$bitOr | Returns the result of a bitwise or operation on an array of int or long values. |
$bitXor | Returns the result of a bitwise xor (exclusive or) operation on an array of int and long values. |
General Changes
serverStatus Metrics
Starting in MongoDB 6.3, the serverStatus command and the db.serverStatus() method have these output changes:
connPoolStats Metrics
Starting in MongoDB 6.3, the connPoolStats command has these output changes:
| Document | Field(s) |
|---|---|
New connPoolStats.acquisitionWaitTimes document. | Time ranges with the number of connection requests in each range. Total number of connection requests for all time ranges. |
Session Workflow Log Message
Starting in MongoDB 6.3, a message is added to the log if the time to send an operation response exceeds the slowms threshold option. For details, see Session Workflow Log Message.
explain Output Includes Fields for Spilled Data File Size
Starting in MongoDB 6.3, the explain output for the $group stage includes new metrics on spill data when using the classic execution engine:
spillFileSizeBytes, the size of the spill file written to disk in the$groupstagenumBytesSpilledEstimate, estimate of the number of bytes written to disk in the$groupstage before compression
For details, see $sort and $group Stages.
Connection Acquisition To Wire Log Message
Starting in MongoDB 6.3, a message is added to the log if the time that an operation waited between acquisition of a server connection and writing the bytes to send to the server over the network exceeds 1 millisecond. For details, see Connection Acquisition To Wire Log Message.
Server Parameters
Starting in MongoDB 6.3, these server parameters were added:
slowConnectionThresholdMillissets the time limit to log the establishment of slow server connections.chunkMigrationConcurrencysets the number of threads on the source shard and the receiving shard for migrating chunks.planCacheSizesets the size of the plan cache for the slot-based query execution engine.
Time Series Collection Custom Bucketing Parameters
MongoDB 6.3 adds the following time series parameters:
bucketMaxSpanSecondssets the maximum time span between measurements in a bucket.bucketRoundingSecondssets the time interval that determines the starting timestamp for a new bucket.
compact Support for Time Series Collections
Starting in MongoDB 6.3, the compact command works with time series collections.
Report an Issue
To report an issue, see https://github.com/mongodb/mongo/wiki/Submit-Bug-Reports for instructions on how to file a JIRA ticket for the MongoDB server or one of the related projects.