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  1. Support throttling the balancer for sharded clusters

    As high throughput clusters grow and documents become larger, the MongoDB balancer may begin impacting workloads.

    I'd like the ability to throttle the speed at which the balancer or chunk migrator runs such that impact is minimised.

    6 votes

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  2. Creation of Custom Views

    SQL based option to create view using multiple collections or databases

    1 vote

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  3. Make IAM database user authentication compatible with AWS SSO

    We are in the process of implementing AWS SSO across our Organisation and wanted to tie this in with mongodb-aws for database authentication.
    Unfortunately we have been informed the 2 services are not compatible.

    This would be a really useful add on to improve management of our systems.

    3 votes

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  4. Document known breaking change in JavaScript Engine

    If a new version of MongoDB will include a new version of MozJS (ex https://jira.mongodb.org/browse/SERVER-29286) and this version will break any existing scripts it would be ideal if this was documented.

    For example, with MongoDB 4.2 "value".contains() no longer worked in scripts and had to be converted to "value".includes()

    2 votes

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  5. Ability to create the resume token based on oplog item

    CHoose an oplog event to set the resume token for, instead of needing to run the change stream for system to create a resume token

    Why: Concerns about many stream re-reading a full oplog if failure before finding first event

    1 vote

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  6. view on nested array

    • It is quite common to have nested array in documents in MongoDB.
    • It is also quite common to have to "flatify" those arrays in queries.

    Here is an example where we have a collection with consultants and their professional experiences.

    consultant [{
       name:"Toto",
       age: 25,
       experiences: [{
          role: "Sofware Engineer",
          from: "2010-01-01",
          to: "2012-01-01",
          company: "CompanyA"
       }, {
          role: "Data Analyst",
          from: "2018-01-01",
          to: "2020-01-01",
          company: "CompanyB"
       }]
    }]
    

    If we would like to list all experiences at a company during a certain period of time, we would have to do an aggregate query with 3 steps that are sometimes…

    3 votes

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  7. VPC between ATLAS/MongoDB/AWS and Heroku/AWS

    Would be a great great feature if we can create a VPC between ATLAS/MongoDB/AWS and Heroku/AWS.
    Thanks.
    Adailton Silva

    1 vote

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  8. Cloning User/Roles along with Database

    When cloning a Database it would be helpful if User/Roles could be cloned directly as well and carried over.

    1 vote

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  9. Tag-aware permissions to control access to analytics nodes

    MongoDB has the great future of Workload Isolation based on node tags: we can add nodes tagged for analytics or reporting and then configure the same tag for this type of connections so that they do not interfere with the main operational workload.

    But it is the responsibility of the BI/Data Scientist/Analyst to properly configure the connection: it cannot be enforced in a centralised way. It would be great if MongoDB permissions could be "tag aware", and allow access for a particular user only to some nodes of the cluster.

    1 vote

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  10. Add option to repair a single collection

    Add support for repairing a single collection instead of what is currently available to repair an entire database via db.repairDatabase()

    2 votes

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  11. provide faster way to perform a count() on million documents

    a couple of customer a shifting from MongoDB to other DBs like Redis or even PostreSQL as count is too slow on MongoDB when there are a lot of document to count even with use of indexes

    5 votes

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  12. Pass document field to $loolup.from and $lookup.as

    Suppose I have collection of documents { entityId, entity }, where entity is names of other collections I would like to make aggregation with lookup and be able to pass entity value to $lookup from and as

    db.collection.aggregation([{ $lookup: { from: '$entity', let: { entityId: '$entityId' }, pipeline: [{ $match: { $expr: { $eq: ['$_id', '$$entityId'] } } }], as: '$entity' } }])

    As of mongo v4.4.4 that seems not working.

    1 vote

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  13. Have a role that allows that user to control the schema of a collection

    As a DBA or Data Architect, I want to be able to enforce data governance policies like schema control. Users of MongoDB cannot change the schema however DBA or named individuals have the ability to change the schema.

    1 vote

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  14. 2dindex

    geoIntersect queries on spherical geometries are not adapted to our use case. Our need is to retrieve a list of tiles intersecting a given area of interest (AOI) in a flat 2d geometry.

    Classical geo-spatial databases (PostGIS and Oracle Spatial) support this kind of approach at no extra cost and we would expect the same from MongoDB.

    In MongoDB , using a 2dsphere index forces us to implement a workaround adding an artificial margin to the AOI and making a post-processing to remove false positives. See attached slides for explanations.

    Best Regards

    1 vote

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  15. Support for Ubuntu 20.4 in MongoDB Server version 4.2

    Per the Server Support Matrix https://docs.mongodb.com/manual/installation/ support for Ubuntu 20 is in MongoDB Server version 4.4+ but not 4.2.
    We would like to see the currently supported MongoDB Server version 4.2 available on the Ubuntu 20.4 LTS distribution.

    5 votes

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  16. log connection string used by application to connect

    there are multiple options to connect to mongo: you can connect to specific node or you can connect to the whole replicaset etc...
    if DBA does not have access to source code - it's not possible to validate if application properly configured and connects to replicaset.

    it would be nice to let mongoDB dump to mongod.log used connection string and/or details how exactly client sessions is connected to mongo.

    3 votes

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  17. Low latency Change Stream for Global Cluster in Atlas

    our event-driven applications need to publish events to Kafka triggered by Change Stream feature. It works perfect in replicaset MongoDB cluster.

    However, after migrating to Global Cluster in Atlas, the Change Stream cannot keep low latency because of ordering reason among shards.
    The latency may go up to 20 seconds when for a single change event.

    It would be nice if application can receive Change Stream from the single shard only (not care about ordering among shards) to prevent latency.

    The idea is to pass "location" options when starting the Change Stream cursor.

    3 votes

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  18. Diacritic insensitive contains search on a single field

    I would like to perform a "contains" query on a single text field in a case insensitive and diacritic insensitive way. I would like the query to have the performance of the field being in a text index by itself (assuming that this gives the maximum speed).

    It is usually the case that the text index already exists for multiple fields. This means that a text search then has to be combined with a complicated (to make it diacritic insensitive) regex expression to find the correct results.

    https://developer.mongodb.com/community/forums/t/query-for-field-containing-a-string-case-in-sensitive-and-diacritic-in-sensitive/14814/2/

    1 vote

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  19. updateMany limit

    When porting an application backend from an RDBMS to MongoDB, we've spoken to two people who've are looking for a way to specify a limit on the number of documents in .updateMany(). I understand the behavior cannot be defined on a sharded cluster, but if we had a way to do this on an unsharded collection, that would help when dealing with these teams.

    1 vote

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  20. Add an option for $addToSet to use a specific field in the array for uniqueness

    Currently, the $addToSet for upserting to an array checks for object equality (when the array elements are objects). We sometimes need to check for uniqueness based on a specific field of the object rather than the object as a whole, and the only way to do this is to force single-threaded operation and to use $pull and $push.

    If there is a way to specify the field to check uniqueness for the $addToSet , we would be able to perform writes normally.

    1 vote

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