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Increment not working with parallel calls. #4892
Description
Issue Description
Increment op not working with concurrent calls
Steps to reproduce
Do this:
Expected Results
a value of 4000 in the cost attribute
Actual Outcome
3562
Environment Setup
-
Server
- parse-server version (Be specific! Don't say 'latest'.) : 2.8.2
- Operating System: ubuntu
- Hardware: ram 1gb,
- Localhost or remote server? : DigitalOcean
-
Database
- MongoDB version: 3.4
- Storage engine: no idea
- Hardware: n/a
- Localhost or remote server? (AWS, mLab, ObjectRocket, Digital Ocean, etc): everywhere, in my local computer too.
Logs/Trace
No error logs no nothing,
Activity
flovilmart commentedon Jul 12, 2018
Are you sure all 4000 calls passed and none failed?
elios264 commentedon Jul 12, 2018
I just tried again while watching the log,
291 instead of 300
In my original problem it happens with only 2-4 concurrent increments requested in cloud code with afterSaves hooks.
flovilmart commentedon Jul 12, 2018
Again, there is no guarantee that all your calls are passing, and returning 2xx. Then if you say 2 concurrent increments cause an issue, that’s skmething else. But I’m not convinced that all your calls really are processed by the server and not dropped, throttled or else.
In the case you’re describing, that would mean 2 different calls return with the same value. Which isn’t proved yet
elios264 commentedon Jul 12, 2018
Upon trying to get a case where 2 different calls returning the same value, I discovered than other beforeSave hook was causing this bug,
Sorry for the inconvenience!