Batch update fails with BSON error

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    • Type: Bug
    • Resolution: Done
    • Priority: Major - P3
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    • Affects Version/s: None
    • Component/s: JavaScript
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      Not sure how to create a proper reproduction as I only face the issue at one very specific collection. I think it might be similar to https://jira.mongodb.org/browse/SERVER-32372 though.

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      Not sure how to create a proper reproduction as I only face the issue at one very specific collection. I think it might be similar to https://jira.mongodb.org/browse/SERVER-32372  though.
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      When executing a batch update for one of our collections(5806 docs) we suddenly get a:

      error: MongoError: BSONObj size: 16797454 (0x1004F0E) is invalid. Size must be between 0 and 16793600(16MB) First element: update: "collection_name"

      using the node native driver at 3.1.10 on latest mongo 4.0 series @atlas

      const bulk = db.collection(coll).initializeUnorderedBulkOp()
docs.forEach((\{query, update}) => bulk.find(query).updateOne(update)
bulk.execute()

      While I managed to work around this issue by using manually decreasing the batch size via

      let bulk = db.collection(coll).initializeUnorderedBulkOp();
let counter = 0;
for (const \{query, update} of docs) {
  bulk.find(query).updateOne(update);
  counter++;
  if ( counter % 500 == 0 ) {
    bulk.execute();
    counter = 0;
    bulk = db.collection(coll).initializeUnorderedBulkOp();
  }
}

      as i get the docs this should be handled internally.

            Assignee:
            Danny Hatcher (Inactive)
            Reporter:
            lukas strassel
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              Created:
              Updated:
              Resolved: