Concurrency issues

The Malawi production instance has started seeing a bunch of issues that are related to concurrent requests (usually from the same user). The goal of this page is to keep track of the reported issues, pending discussions and possible fixes.

Possible causes of concurrent requests from the same user:

• operations taking a long time and therefore making the user refresh the page and send a new request
• offline mode breaking the loading modal and therefore allowing user to send a new request ( OLMIS-3163 - Getting issue details... STATUS )
• possibly missing loading modal in some states (like MALAWISUP-133 - Getting issue details... STATUS )
• is it somehow possible to double click on an action button before loading modal is displayed? (perhaps on slower computers?) Less technical users may be double-clicking on buttons and links

Other causes of concurrent requests:

• concurrent requests are to be expected - users may have access to the same resources and they can invoke actions on them in the same time

Current issues caused by concurrent reqeuests:

• duplicate comments / status messages - MW-203 - Getting issue details... STATUS
• duplicate requisition initiate, displaying weird errors to the user (a workaround has been applied in Malawi) - MW-586 - Getting issue details... STATUS
• duplicate adjustments reasons (difficult to reproduce, but happens once in a while) - MALAWISUP-86 - Getting issue details... STATUS
• MALAWISUP-181 - Getting issue details... STATUS originally caused by duplicate adjustment reasons ( MALAWISUP-86 - Getting issue details... STATUS )
• most likely more...

Pending discussion:

https://groups.google.com/forum/#!topic/openlmis-dev/C3PtdbK0m5I