is it possible that a user can only be assigned to one task at a time?

[Vishnu]

When an user is assigned to a ticket which is still in open status, then the other users/project admins shouldn't be able to assign that user to another tickets. Is it possible to achieve this using any technique/method?

[Nic Brough -Adaptavist- · Accepted solution]

No, there's no way to do that.

You could do it if you were using DC though, but you'd need to rewrite and recompile bits of Jira to do it.

[Vishnu]

Thanks Nic

[Sayed Bares _ServiceRocket_]

There is definitely a workaround which you can use to achieve this. It might not be straight forward but it gets the job done.

The approach I would take is basically creating an automation, listening to the assigned trigger, checking if the assignee already has open ticket(s), then add a comment saying that the user has other commitments (optional), and finally unassign the issue.

This is basically your own custom validator like automation.

Here is a screenshot which you can use as a draft:

Hope it helps!