In our solution we have asynchronous processes with state persistence (aka sagas) where each saga has single state document persisted in mongodb. Depending on the saga type, this document may lead to high level of concurrent updates. So, we simply introduced optimistic concurrency there to retry handling of incoming messages. But as a result of that we face very high rate of retries what results in significant performance degradation. In the past we used pessimistic locking of saga document/record when used to store state in rdbms (mssql, oracle etc). I know that at the moment there is no such feature in mongodb, but maybe it would be useful/possible to have it for single document updates? I believe this feature could simplify many solutions.
Are there any other concurrency handling options? Suggestions?
