The atomicity of MongoDB upsert operation concurrency, mongodbupsert

The atomicity of MongoDB upsert operation concurrency, mongodbupsert

When C ++ is used to perform the update operation on MongoDB, if the upsert parameter is set to true, data that does not exist is automatically inserted. In a high concurrency environment, data duplication may occur.

The solution is to add a unique index for the query condition. Refer to the official documentation:

Http://docs.mongodb.org/manual/core/write-operations-atomicity/

Http://docs.mongodb.org/manual/core/index-unique/#index-type-unique

After high-pressure tests, this solution proved to be reliable.