open-nomad/.changelog/12112.txt
Tim Gross cfe3117af8
CSI: enforce usage at claim time (#12112)
* Remove redundant schedulable check in `FreeWriteClaims`. If a volume
  has been created but not yet claimed, its capabilities will be checked
  in `WriteSchedulable` at both scheduling time and claim time. We don't
  need to also check them in the `FreeWriteClaims` method.

* Enforce maximum volume claims for writers.

  When the scheduler checks feasibility for CSI volumes, the check is
  fairly loose: earlier versions of the same job are not counted as
  active claims. This allows the scheduler to place new allocations
  for the new version of a job, under the assumption that we'll replace
  the existing allocations and their volume claims.

  But when the alloc runner claims the volume, we need to enforce the
  active claims even if they're for allocations of an earlier version of
  the job. Otherwise we'll try to mount a volume that's currently being
  unmounted, and this will cause replacement allocations to frequently
  fail.

* Enforce single-node reader check for read-only volumes. When the
  alloc runner makes a claim for a read-only volume, we only check that
  the volume is potentially schedulable and not that it actually has
  free read claims.
2022-02-24 09:37:37 -05:00

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```release-note:bug
csi: Fixed a bug where the maximum number of volume claims was incorrectly enforced when an allocation claims a volume
```