This commit introduces a validation rule to limit the number of selectors
in a DeviceClass to 32. This is done by adding the `+k8s:maxItems=32`
marker to the DeviceClassSpec and running the code generator.
The following changes are included:
- Updated `staging/src/k8s.io/api/resource/v*/types.go` with the validation marker.
- Regenerated validation code in `pkg/apis/resource/v*/zz_generated.validations.go`.
- Improved error message in `pkg/apis/resource/validation/validation.go`.
- Added tests in `pkg/registry/resource/deviceclass/declarative_validation_test.go`
to cover the new validation.
The boilerplate for running declarative validation was duplicated across multiple resource strategies. This included feature gate checks, metric identifier generation, error comparison, and conditional merging logic, which made the code verbose and difficult to maintain.
This commit introduces a new helper function, `rest.ValidateDeclarativelyWithMigrationChecks`, to encapsulate this common logic. All relevant strategies have been refactored to use this new function, resulting in cleaner and more concise code.
This removes the DRAControlPlaneController feature gate, the fields controlled
by it (claim.spec.controller, claim.status.deallocationRequested,
claim.status.allocation.controller, class.spec.suitableNodes), the
PodSchedulingContext type, and all code related to the feature.
The feature gets removed because there is no path towards beta and GA and DRA
with "structured parameters" should be able to replace it.
In the API, the effect of the feature gate is that alpha fields get dropped on
create. They get preserved during updates if already set. The
PodSchedulingContext registration is *not* restricted by the feature gate.
This enables deleting stale PodSchedulingContext objects after disabling
the feature gate.
The scheduler checks the new feature gate before setting up an informer for
PodSchedulingContext objects and when deciding whether it can schedule a
pod. If any claim depends on a control plane controller, the scheduler bails
out, leading to:
Status: Pending
...
Warning FailedScheduling 73s default-scheduler 0/1 nodes are available: resourceclaim depends on disabled DRAControlPlaneController feature. no new claims to deallocate, preemption: 0/1 nodes are available: 1 Preemption is not helpful for scheduling.
The rest of the changes prepare for testing the new feature separately from
"structured parameters". The goal is to have base "dra" jobs which just enable
and test those, then "classic-dra" jobs which add DRAControlPlaneController.
This is a complete revamp of the original API. Some of the key
differences:
- refocused on structured parameters and allocating devices
- support for constraints across devices
- support for allocating "all" or a fixed amount
of similar devices in a single request
- no class for ResourceClaims, instead individual
device requests are associated with a mandatory
DeviceClass
For the sake of simplicity, optional basic types (ints, strings) where the null
value is the default are represented as values in the API types. This makes Go
code simpler because it doesn't have to check for nil (consumers) and values
can be set directly (producers). The effect is that in protobuf, these fields
always get encoded because `opt` only has an effect for pointers.
The roundtrip test data for v1.29.0 and v1.30.0 changes because of the new
"request" field. This is considered acceptable because the entire `claims`
field in the pod spec is still alpha.
The implementation is complete enough to bring up the apiserver.
Adapting other components follows.
