Replica sorting algorithms described in documentation are not implemented

[rdimaio]

The documentation for list_replicas describes three sorting algorithms that have not been implemented yet:

https://github.com/rucio/rucio/blob/0bbc069faf17f06eff1891aa90e634adea67b216/lib/rucio/core/replica_sorter.py#L340-L367

Opening this issue as I could not find an open issue tracking this work.

I think it would be also be worth discussing whether we actually need different algorithms for sorting replicas, or if the current one suffices.

• [ ] closeness
• [ ] ranking
• [ ] dynamic

Some extra notes:

closeness

Replicas sorted by AGIS closeness. I assume that AGIS here stands for the ATLAS Grid Information System (https://twiki.cern.ch/twiki/bin/view/AtlasComputing/AtlasGridInformationSystem), in which case it seems to be ATLAS-specific information.

We should probably not have this in the Rucio core package (unless we can generalize it in some way, which I doubt) - it should be part of the ATLAS policy package instead.

dynamic

"Rucio Dynamic Smart Sort (tm)". What does this mean? The docstring says "Return a list of replicas sorted by dynamic network metrics.", but I'm not sure which dynamic network metrics this would involve.

I could not find issues/PRs about this, so if someone has more context on what this is meant to do it would be welcome.