MongoTemplate BulkOperations atomicity

[Sumanta_Mukhopadhyay]

@Noam_Gershi

Hi

When I use bulk operations as in the example below (inserting a new document, and then updating it it with server-side date) - does the mongo-server creates a new document without the Date, and then updates it with Date, or the document will be created with Date from the beginning.

I want to know if there could be happen that a client will fetch the document without the Date?

    @Test
    public void testInsertAndUpdate() {
        ObjectId clientSideObjectId = new ObjectId();
        TestedObjectWithId object = new TestedObjectWithId("name", clientSideObjectId);
        BulkOperations bulkOperations =
                mongoTemplate.bulkOps(UNORDERED, COLLECTION_NAME)
                        .insert(object)
                        .updateOne(
                                query(where(ID_FIELD_NAME).is(clientSideObjectId)),
                                new Update().currentDate("serverSideCurrentDate")
                        );
        bulkOperations.execute();
    }

In MongoDB, bulk operations like insert and update are executed in order and atomically, meaning either all operations succeed or all operations fail.

In the example you provided, the MongoDB server will create the document with the “name” field and the client-side generated ObjectId, and then update the document to include the “serverSideCurrentDate” field.

There is no possibility for a client to fetch the document without the “serverSideCurrentDate” field, as the update operation is guaranteed to be atomic and successful.