Affects Version/s: None
Fix Version/s: 1.7.0
We currently run into issues with the DRF scheduler that frameworks do not receive offers (see https://github.com/mesosphere/marathon/issues/1931 for details).
Imagine that we have 10 frameworks and unallocated resources from a single slave.
Allocation interval is 1 sec, and refuse_seconds (i.e. the time for which a declined resource is filtered) is 3 sec across all frameworks.
Allocator offers resources to framework 1 (according to DRF) which declines the offer immediately.
In the next allocation interval framework 1 is skipped due to the declined offer before. Hence the next framework 2 is offered the resources, which it also declines.
The same procedure in the next allocation interval (with framework 3).
In the next allocation interval the refuse_seconds for framework 1 are over, and as it still has the lowest DRF share it gets the resource offered again, which it again declines. And the cycle begins again....
Framework 4 (which is actually waiting for this resource) is never offered this resource.