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Operating System:
ALL
Steps To Reproduce:

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N = 1000

// create data
db.coll.drop()
for (i = 0; i < N; i++) {
newItem =
{"a":1,"b":2}
;
db.coll.insert(newItem);
}

// update
db.coll.find().forEach(function (obj) {
obj.map =
{ "a":obj.a, "b":obj.b }
;
delete obj.a;
delete obj.b;
db.coll.save(obj);
});
//

// check
db.coll.aggregate( { $group :
{ _id : "$map.a",
totalA :
{ $sum : "$map.b" }
}
});

The output should be 2000, it is 1798 in 2.6.0 and 1800 in 2.4.10.

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N = 1000 // create data db.coll.drop() for (i = 0; i < N; i++) { newItem = {"a":1,"b":2} ; db.coll.insert(newItem); } // update db.coll.find().forEach(function (obj) { obj.map = { "a":obj.a, "b":obj.b } ; delete obj.a; delete obj.b; db.coll.save(obj); }); // // check db.coll.aggregate( { $group : { _id : "$map.a", totalA : { $sum : "$map.b" } } }); The output should be 2000, it is 1798 in 2.6.0 and 1800 in 2.4.10.

The mongo shell deletes objects using delete rather then just delete the reference.

duplicates

SERVER-13354 delete operator in db.collection.find().forEach() sometimes behaves incorrectly