Unordered bulk update in MongoDB using JAVA

Question

I have MongoDB documents like:

{_id:1001, "title":"abc", "author":"xyz"}

What is the best way to update author for 1 million such documents? I came to know about the unordered bulk update in MongoDB. How to implement that using Mongo's Java Driver.

The bulk operations are used to buffer write operations it client side and execute these in batches. In order to achieve what you want, issue an update comment `db.books.update({auther : "xyz"},{$set : {author: "whatever"}}, {multi:true})` — Ori Dar, May 21 '15 at 10:42
Well, I don't see any added value if merely want to update a single field for a bunch of documents — Ori Dar, May 21 '15 at 10:51

score 1 · Accepted Answer · answered May 21 '15 at 10:57

1

    MongoClient mongo = new MongoClient("localhost", 27017);
    DB db = (DB) mongo.getDB("test1");
    DBCollection collection = db.getCollection("collection");
    BulkWriteOperation builder = collection.initializeUnorderedBulkOperation();
    builder.find(new BasicDBObject("_id", 1001)).upsert()
                    .replaceOne(new BasicDBObject("_id", 1001).append("author", "newName"));
    //append all other documents 
    builder.execute();

answered May 21 '15 at 10:57

Dev

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@Orid This is what I am talking about. – Dev May 21 '15 at 10:57
But this replaces the entire document and doesn't update it. After this operation the field 'title' id removed from the document. – user320550 Oct 21 '16 at 22:56

Unordered bulk update in MongoDB using JAVA

1 Answers1