Support canceling a submission #43
Description
Right now, it is not possible to cancel an ongoing submission from the Producer side.
Also from inside a Consumer, it is (only) currently possible to intentionally fail the same chunk over and over again. That will fail that particular chunk and as a result the full submission. But intentional cancellation is actually an 'OK' state rather than a 'failure' state.
So goal of this issue is:
- Implement the logic to cancel a submission. I think the cleanest approach would be to introduce a new submission status (besides 'in progress', 'completed' and 'failed') for this. You can probably in big part base that logic on the current logic that fails a submission, except that this new kind of failure should be conveyed to the user as 'happy' rather than 'something is broken'.
- Add a new API call on the Producer side to cancel a submission