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Type:
Bug
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Resolution: Unresolved
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Priority:
Major - P3
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Affects Version/s: None
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Component/s: None
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I upgraded my atlas cluster from v5 -> v6 -> v7.
I’m using a cluster in Atlas on version 7
db.version() 7.0.16
sample_airbnb.listingsAndReviews was created when this cluster was using version 5 of mongodb.
var cursor = db.listingsAndReviews.aggregate([{$changeStream: {}}]); db.listingsAndReviews.insertOne({ items: [2,30,5,10,11,100,200,250,300,5,600]}) ... db.listingsAndReviews.updateOne({}, [{ $set: { items: [2,30,5,10,11,100,200,250,300,5]} }]) ... cursor.tryNext() { _id: { _data: '82678823EA000000012B042C0100296E5A10041CD762F8AA4F4E8A8FEB22A5BE6E3AD0463C6F7065726174696F6E54797065003C7570646174650046646F63756D656E744B657900463C5F6964003C313030353131363400000004' }, operationType: 'update', clusterTime: Timestamp({ t: 1736975338, i: 1 }), wallTime: 2025-01-15T21:08:58.314Z, ns: { db: 'sample_airbnb', coll: 'listingsAndReviews' }, documentKey: { _id: '10051164' }, updateDescription: { updatedFields: { items: [Array] }, removedFields: [], truncatedArrays: [] } }
however, if I use a new db then I see truncatedArrays as expected
{ _id: { _data: '8267882575000000012B042C0100296E5A1004BC812FB00FCD4F26A2E6F1E39A16DE75463C6F7065726174696F6E54797065003C7570646174650046646F63756D656E744B65790046645F6964006467882564D23A65A6AC954FA9000004' }, operationType: 'update', clusterTime: Timestamp({ t: 1736975733, i: 1 }), wallTime: 2025-01-15T21:15:33.758Z, ns: { db: 'test2', coll: 'coll' }, documentKey: { _id: ObjectId('67882564d23a65a6ac954fa9') }, updateDescription: { updatedFields: {}, removedFields: [], truncatedArrays: [ [Object] ] } }
Let me know if you'd like a link to my cluster to investigate, its in staging.
Slack thread:
https://mongodb.slack.com/archives/C6WSFCJDC/p1736973127681079