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Backwards Compatibility:
Fully Compatible
Operating System:
ALL
Backport Requested:

v6.3, v6.0, v5.0, v4.4, v4.2
Steps To Reproduce:
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(function() { "use strict"; const validatorObj = { $jsonSchema: { bsonType: "object", properties: { s: {bsonType: "string", description: "x".repeat(4801)}, } } }; const nCollections = 3300; assert.commandWorked(db.dropDatabase()); jsTestLog(`Creating ${nCollections} collections....`); for (let i = 0; i < nCollections; i++) { assert.commandWorked(db.createCollection("c_" + i.toPrecision(6), {"validator": validatorObj})); } jsTestLog(`Done creating ${nCollections} collections`); const res = db.runCommand({"listCollections": 1}); assert.commandWorked(res); }());
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(function() { "use strict" ; const validatorObj = { $jsonSchema: { bsonType: "object" , properties: { s: {bsonType: "string" , description: "x" .repeat(4801)}, } } }; const nCollections = 3300; assert .commandWorked(db.dropDatabase()); jsTestLog(`Creating ${nCollections} collections....`); for (let i = 0; i < nCollections; i++) { assert .commandWorked(db.createCollection( "c_" + i.toPrecision(6), { "validator" : validatorObj})); } jsTestLog(`Done creating ${nCollections} collections`); const res = db.runCommand({ "listCollections" : 1}); assert .commandWorked(res); }());
Sprint:
QE 2023-04-03

"listCollections" command fails with BSONObjectTooLarge error when:

Likely other commands such as "find" and "aggregate" are affected.

Extremely likely the root cause is not accounting for array element field element size when building the result.