ExceededMemoryLimit on Query

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    • Type: Bug
    • Resolution: Declined
    • Priority: Major - P3
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    • Affects Version/s: None
    • Component/s: None
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      Hi all,
      We have recently updated from MongoDb 8.0.4 to 8.0.5 and noticed, that some of our queries keep failing with following error message:
      ```

      {"code": 146, "codeName": "ExceededMemoryLimit", "errmsg": "PlanExecutor error during aggregation :: caused by :: $map would use too much memory and cannot spil..."}

      ```

      Our queries execute aggregations (please see example below).
      What has changed, that we're exceeding the memory limit?

      We haven't changed the configuration at all.
      What would be a proper way to solve this situation?

      Example:
      ```

      db.myCollection.aggregate([
{ $sample: \{ size: 1 } },
{ $unset: "_id" },
{
$project: {
matches: {
$map: {
input: \{ $range: [0, 50000] },
in: "$$ROOT"
}
}
}
},
{ $unwind: "$matches" },
{ $replaceRoot: \{ newRoot: "$matches" } },
{ $merge: \{ into: "myCollection" } }
])

      Explain:

      serverInfo: {
host: 'caas-mongo-0',
port: 27017,
version: '8.0.4',
gitVersion: 'bc35ab4305d9920d9d0491c1c9ef9b72383d31f9'
},
serverParameters: {
internalQueryFacetBufferSizeBytes: 104857600,
internalQueryFacetMaxOutputDocSizeBytes: 104857600,
internalLookupStageIntermediateDocumentMaxSizeBytes: 104857600,
internalDocumentSourceGroupMaxMemoryBytes: 104857600,
internalQueryMaxBlockingSortMemoryUsageBytes: 104857600,
internalQueryProhibitBlockingMergeOnMongoS: 0,
internalQueryMaxAddToSetBytes: 104857600,
internalDocumentSourceSetWindowFieldsMaxMemoryBytes: 104857600,
internalQueryFrameworkControl: 'trySbeRestricted',
internalQueryPlannerIgnoreIndexWithCollationForRegex: 1
}

      Please let me know if you need additional information.

      Misc:
      Could this be related to SERVER-90068 (included in v8.0.5) ?

            Assignee:
            Unassigned
            Reporter:
            Nicolai McAlley
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              Created:
              Updated:
              Resolved: