Processing jobs sequentially

[akshayrawat]

Is it possible to process jobs sequentially, based on arguments?

Example jobs:

Jobs: [User A, Operation A], [User B, Operation B], [User A, Operation C], [User B, Operation D], .. stream of jobs

Process all jobs of each user sequentially, but concurrently across users.

Example:

1. Sequentially execute all jobs for User A: Operation A, Operation C
2. Sequentially execute all jobs for User B: Operation B, Operation D

However (1), (2) get executed concurrently.

I couldn't make out from the documentation if its possible. Any pointers would be much appreciated.