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  1. Mesos
  2. MESOS-3202

Avoid role/framework offer starvation in DRF allocator.

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Details

    • Bug
    • Status: Resolved
    • Major
    • Resolution: Fixed
    • None
    • 1.7.0
    • None
    • None

    Description

      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.

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            Unassigned Unassigned
            js84 Jörg Schad
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