Consider the case that different users work on one issue at the same time (Collaborative working). Who's data will be stored and is there a master/slave configuration or do the users overwrite the data the other user just produced seconds before??
And what happens if both users try to save data at the same time? Is there a versioning included?
This is a bug feature that is being tracked here: https://jira.atlassian.com/browse/JRA-6146
Right now, whoever saves last will overwrite all the data that the first user has set.
Each commit will write after the previous one, whether it's a millisecond or a month after the previous.
JIRA retains a full history of change though, so nothing is "lost", and if a change is incompatible with the previous state, the user will be told that their change can't happen (the most common scenario is when a user transitions the issue, and the next update is an attempt to use a transition from the old status that is not available on the new status)
"do the users overwrite the data the other user just produced seconds before??"
It might help us help you if you defined what "Data" you are referring to.
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