Viktor Somogyi-Vass

@kismob is working on this task.

@efeg I think we're ready for a code review here. Since this is a big change, how would you prefer to review it? We have a high level document [here](https://docs.google.com/document/d/1ZedEm0IgkCUPc1Y33g4OTGCFe-ZUhqqb/edit?usp=sharing&ouid=115704332402002638591&rtpof=true&sd=true)...

@kismob would you please rebase the change again to get rid of the conflicts?

@efeg did you have some time to continue the review? Let me know how can we help to make this easier, I recognise this might be a little big of...

Ok, then we'll raise it in separate PRs. Thanks!

@CCisGG yes, it can be closed for now.

@C0urante this problem arises when `stop` is called really fast, right after calling `start` when that is still running. I've attached a log sample to the case but the exception...

To me it seems like it persists. Let me explain what I see in my logs, maybe I'm in the wrong here. So first let's start when it stops the...

@C0urante in fact this was as escalation that our customer brought to us, they were using a dedicated MM2 cluster. In the meantime during another case with the customer we...

@ijuma would you please quickly review this small pr?