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  1. 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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  2. 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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  3. Aggregate $accumulator 'Combine' stage for sharded collections

    After the ‘accumulate’ stage has run against each document on a shard it would be extremely useful to run a script on the shard against the state to reduce the state down to something smaller before passing the final state over the network back to mongos for the ‘merge’. (Over in the Elastic camp they call this the ‘combine_script’).

    Scenario:
    I have a customer orders database sharded by the Customer ID (meaning all data relating to any specific customer is kept on the same shard - so customers don’t need to be ‘merged’ between shards). I can write an accumulator…

    2 votes

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  4. Option to prohibit a non-voting member from becoming a sync source of a voting member

    Hi,

    Our proposition in a few words: add a replica set option to allow chained replication but with the following exception: a non-voting member cannot become a sync source of a voting member under any circumstance.

    This proposition would allow chained replication for clusters having both w=majority writes and analytics nodes.

    Right now, those clusters cannot safely enable chained replication, because under some circumstances, the non-voting analytics member may become the first secondary in a serial chain of replication. In that case, this node[*] slows down the replication process for all downstream secondaries. Higher replication lag translates to extremely slow…

    2 votes

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  5. Assign MongoDB roles to LDAP users

    I would like to create a softlab and therefore give the possibility to a user to create collections in a database which is dedicated to him.

    Currently, to do that I need to :
    1. create a single-member LDAP group for each user
    2. map this group to a MongoDB role authorizing the user's database.

    Create a group with a single member is conceptually useless. I want to avoid step 1.

    My feature request : add the ability to assign MongoDB roles to LDAP users as well as groups.

    Regards,
    Jerome

    2 votes

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  6. Include schema validation events in changestream payload

    let's say my document has JSON schema validation like:

    {
      $jsonSchema: {
        properties: {
          phone: {
            bsonType: 'string'
          }
        }
      }
    }
    

    and the validation action is set to "warning", if I do a command like: db.test.insert({"phone":1}), I would like the warning message to be included in my change stream.

    2 votes

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  7. Support for Transaction Savepoints (Nested Transactions)

    The ability to partially rollback transactions to a specified point.

    2 votes

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  8. Deny Privilege

    Provide the ability to explicitly deny a privilege on a specific resource.

    Example: Grant the privilege to perform the find action on all collections in the test database except "test.secrets".

    2 votes

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  9. Add Event Stream Features (Apache Kafka, NATS Streaming)

    I thought it would be great if mongodb can support an event streaming(event bus) feature.
    Existing popular event streaming services(AWS Kinesis, NATS Streaming, Apache Kafka) can persist data which is somewhat like a database.

    Its great for debugging, data logging for later uses such as machine learning. Since I can see the full flow of the data and its changes.

    But there are two downside with most even streaming services.
    1. Its very difficult to query the data.
    2. "Eventual Consistency" issue when dealing programmatic errors(bugs). Most event streams have this nice feature, which keeps sending the same event to…

    2 votes

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  10. Collection Comments

    I would like the ability to attach comments to a collection so that other people using the data can get some understand of context or important Readme/FAQ that I would need to share.

    2 votes

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  11. Performance problem with compound index using doubles, with range filtering

    It looks like there may be a problem when using doubles in a compound index and using range-test filters against all of them in a query.
    The problem we see from the explain plans is that far more keys are being examined that there should be and this leads to poor performance.
    If we switch to using a similar setup but with integers instead, we don’t see the problem.

    See the second part of this ticket for full details

    https://support.mongodb.com/case/00659614

    We have a document that looks like this –

    {
    "id" : ObjectId("5e2ab24eca314f10b486d827"),
    "attributes" : [
    {
    "attributeCode" :

    2 votes

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  12. Too many keys in 2dsphere index when used on geoJson within arrays

    Mongo support have asked me to raise this bug as an improvement idea because they see it as an edge case.
    The issue is here and includes more details:

    https://support.mongodb.com/case/00659614

    In summary, if you have a geoJson sub document that sits within an array, and you index it using the 2dspehere index, you get keys duplicated for every element in the array.

    For example, if you have geoJson that represents a big 4,500 vertex polygon, and you put it within an array element, if the array has only one element I see 20 keys generated, which is good. But if…

    2 votes

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  13. Making Elections Faster.

    Election is an expensive operation. We can avoid the elections if we can enforce some priority-based ordering on who shall become primary if the current primary fails.
    Specifically, we can keep a node with second highest priority in the data center of the most preferred primary. Usually, the network failures within the data centers are less probable than across the data centers. So, it is reasonable to believe that if the second preferred member loses the contact with current primary, it is the primary node which has failed and not the network. As a supplement, we can also have redundant…

    2 votes

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  14. Create operators that support Centrality Algorithms use cases

    Degree Centrality
    Closeness Centrality
    Harmonic Centrality
    Betweenness Centrality
    Eigenvector Centrality
    PageRank
    ArticleRank

    1 vote

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  15. `$getField` to work with a dynamic `field`

    Currently $getField works only when field resolves at query-compile-time to a string. It would be nice if it worked also when field resolves to a string at runtime.

    See this Jira ticket - https://jira.mongodb.org/browse/SERVER-67030

    1 vote

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  16. Add a $sample accumulator operator

    So that it's easier to sample a number of items from each group, instead of writing lengthy DSL like this:

    https://www.mongodb.com/community/forums/t/sample-x-number-of-documents-in-each-group-with-or-after-a-group-stage/170787

    Ideally it can be expressed like this:


    {
    $group: {
    _id: '$year',
    samples: { $sample: 100 },
    }
    }

    Hence making sampling 100 items from each group a snap to achieve!

    1 vote

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  17. kNN Searches with MongoDB

    Dear MongoDB team,
    The possibility for kNN searches within a collection would be a real game changer. Not only in machine learning, but also in other areas you need this query method to find similar structures.
    Practically, it could go in the same direction as text searches. So that you have to create an index that you can also query similarly and then sort according to the score.

    I speak from my own suffering, as I had to switch from MongoDB to Open-/Elasticsearch for my current project, as they are also non-relational databases but support kNN searches. However, I like…

    1 vote

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  18. Boost the performance of bioinformatic annotation queries

    The documents to be selected look something like this:

    {
    "_id": {
    "$oid": "6272c580d4400d8cb10d5406"
    },
    "#CHROM": 1,
    "POS": 286747,
    "ID": "rs369556846",
    "REF": "A",
    "ALT": "G",
    "QUAL": ".",
    "FILTER": ".",
    "INFO": [{
    "RS": 369556846,
    "RSPOS": 286747,
    "dbSNPBuildID": 138,
    "SSR": 0,
    "SAO": 0,
    "VP": "0x050100000005150026000100",
    "WGT": 1,
    "VC": "SNV",
    "CAF": [{
    "$numberDecimal": "0.9381"
    }, {
    "$numberDecimal": "0.0619"
    }],
    "COMMON": 1,
    "TOPMED": [{
    "$numberDecimal": "0.88411856523955147"
    }, {
    "$numberDecimal": "0.11588143476044852"
    }]
    },
    ["SLO", "ASP", "VLD", "G5", "KGPhase3"]
    ]
    }

    For a basic annotation (https://en.wikipedia.org/wiki/SNP_annotation) scenario, we need such query:

    {'ID': {'$in': ['rs369556846', 'rs2185539', 'rs2519062', 'rs149363311', 'rs55745762', <...>]}}
    , where <...> means hundreds/thousands…

    1 vote

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  19. views on different database (synonyms)

    It would be great if we could have in Mongo the same as in Oracle with DBLink synonyms:
    Access table or views from a different database.

    1 vote

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  20. add view,index,user,role to mongodb Change Stream

    I tested the changeStream of mongodb. The changes of adding view, index, user and role to mongodb are not reflected in changeStream, but the corresponding log can be found in oplog. I have an issue on https://jira.mongodb.org/browse/SERVER-66460 and got it confirmed, but Chris Kelly thinks this should be a feature. Hopes to add this feature in future versions

    1 vote

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