add PodProtections for DefaultEvictorArgs #1665

googs1025 · 2025-04-12T13:21:03Z

k8s-ci-robot · 2025-04-12T13:21:08Z

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ricardomaraschini · 2025-04-14T14:22:20Z

pkg/framework/plugins/defaultevictor/defaults.go

@@ -49,6 +49,9 @@ func SetDefaults_DefaultEvictorArgs(obj runtime.Object) {
 	if args.PriorityThreshold == nil {
 		args.PriorityThreshold = nil
 	}
+	if args.EvictionProtection == nil {
+		args.EvictionProtection = nil
+	}


What is the purpose of this function ?

oh... This is also where I am confused. I just added it in the same way as before...

Unfortunate product of duplicating the no-op constructs.

README.md

googs1025 · 2025-04-23T11:24:54Z

README.md

        nodeFit: true
        minReplicas: 2
+        # List of disabled default pod protections. This allows users to selectively disable certain protection rules.


We will recommend users to use the new config here

googs1025 · 2025-04-23T11:30:49Z

pkg/framework/plugins/defaultevictor/validation.go

 	}

 	if args.MinReplicas == 1 {
 		klog.V(4).Info("DefaultEvictor minReplicas must be greater than 1 to check for min pods during eviction. This check will be ignored during eviction.")
 	}

+	// check if any deprecated fields are set to true


validate check here: We do not want users to mix old and new config. If any of the old config is true and there is a value in the new config list (including: DisabledDefaultPodProtections and ExtraPodProtections), it means that they are mixed and the validation fails.

googs1025 · 2025-04-23T14:27:44Z

pkg/framework/plugins/defaultevictor/constraints.go

+	frameworktypes "sigs.k8s.io/descheduler/pkg/framework/types"
+	"sigs.k8s.io/descheduler/pkg/utils"
+)
+


I think add new file constraints.go to be more clear

googs1025 · 2025-05-13T05:20:19Z

I hope we can reach an agreement and merge it into the master before the next release. 😄
@ingvagabund @a7i @ricardomaraschini Can you help with this PR? I know this may take some time....

ingvagabund · 2025-05-15T16:25:08Z

pkg/framework/plugins/defaultevictor/types.go

+
+	// DisabledDefaultPodProtections is a list that specifies which default Pod protection mechanisms are disabled.
+	// Users can selectively disable certain default protection rules via this field.
+	DisabledDefaultPodProtections []DisabledDefaultPodProtection `json:"disabledDefaultPodProtections,omitempty"`


What about to put the list of disabled and extra enabled policies under a single field? E.g.

# Pod anti-eviction/protection policies. # The list of policies enabled by default: # - protect pods with local storage, extend disabled with 'podsWithLocalStorage' to disable the protection # - protect daemon set pods, extend disabled with `daemonSetPods` to disable the protection # - ... protectionPolicies: # list of extra enabled policies extraEnabled: # list of disabled pod policies disabled:

?

Here is a good suggestion
we can config like this:

- name: "DefaultEvictor" args: # Deprecated: Use `disabledDefaultPodProtections` with "systemCriticalPods" instead. # evictSystemCriticalPods: true # Deprecated: Use `disabledDefaultPodProtections` with "failedBarePods" instead. # evictFailedBarePods: true # Deprecated: Use `disabledDefaultPodProtections` with "withLocalStorage" instead. # evictLocalStoragePods: true nodeFit: true minReplicas: 2 protectionPolicies: extraEnabled: - withPVC - withoutPDB # list of disabled pod policies disabled: - withLocalStorage - systemCriticalPods - failedBarePods - daemonSetPods

ingvagabund · 2025-05-15T16:39:38Z

pkg/framework/plugins/defaultevictor/types.go

+
+// DisabledDefaultPodProtection defines the type for default Pod protection mechanisms.
+// Each value represents a specific protection rule that can be disabled.
+type DisabledDefaultPodProtection string


Both DisabledDefaultPodProtection and ExtraPodProtection can be consolidated into a single type. E.g.

type PodProtectionPolicy string const ( PodsWithLocalStorage PodProtectionPolicy = "podsWithLocalStorage" DaemonSetPods PodProtectionPolicy = "daemonSetPods" SystemCriticalPods PodProtectionPolicy = "systemCriticalPods" FailedBarePods PodProtectionPolicy = "failedBarePods" PodsWithPVC PodProtectionPolicy = "podsWithPVC" PodsWithoutPDB PodProtectionPolicy = "podsWithoutPDB" )

With some of the policies enabled by default. Other used for extra enabling or disabling. Also, would you please have defaults.go set the default list of enabled policies too? E.g.

args.defaultPodProtectionPolicies = [PodsWithLocalStorage, DaemonSetPods, ...]

while extending the new private defaultPodProtectionPolicies field with a comment saying the list of default policies is a subject to change?

#1664 (comment)
@ingvagabund
We have discussed why not to use the default value here

I thinks this(set default value) will make the behavior incompatible with previous. I think using two types will not have any impact for user. It will also avoid coding errors of different strategies in the delegate (because we distinguish enable and disable as different types).

defaultPodProtectionPolicies is going to be a private variable only, not exposed to customers. Only for internal use.

googs1025 · 2025-05-17T03:45:36Z

pkg/framework/plugins/defaultevictor/types.go

+}
+
+// PodProtectionPolicy defines the protection policy for a pod.
+type PodProtectionPolicy string


Change to one type and use ExtraEnabled Disabled to decide

googs1025 · 2025-05-17T03:46:51Z

pkg/framework/plugins/defaultevictor/defaultevictor.go

-			if uint(len(objs)) < defaultEvictorArgs.MinReplicas {
-				return fmt.Errorf("owner has %d replicas which is less than minReplicas of %d", len(objs), defaultEvictorArgs.MinReplicas)
-			}
+	if !useNewConfig {


We are here to maintain compatibility with the old config logic.

ingvagabund

To make the review and refactoring easier to follow would you please move the changes in constaints.go into a separate PR? Without introducing the pod protection policy. Just to refactor the code is it's easier to introduce the pod protection policies later.

pkg/framework/plugins/defaultevictor/defaultevictor.go

ingvagabund · 2025-05-18T13:19:53Z

pkg/framework/plugins/defaultevictor/defaultevictor.go

+// It supports both new-style (PodProtectionPolicies) and legacy-style flags.
+func getEffectiveProtectedPolicies(args *DefaultEvictorArgs) []PodProtectionPolicy {
+	if args.defaultPodProtectionPolicies == nil {
+		args.defaultPodProtectionPolicies = BuiltInPodProtectionPolicies


defaultPodProtectionPolicies is used only for internal purposes so the same list of default policies does not have to be duplicated. If you plan to define BuiltInPodProtectionPolicies as well the new variable can be used instead of the internal defaultPodProtectionPolicies field.

removed BuiltInPodProtectionPolicies
I think we just use defaultPodProtectionPolicies is enough 🤔

pkg/framework/plugins/defaultevictor/defaultevictor.go

pkg/framework/plugins/defaultevictor/constraints.go

googs1025 · 2025-05-19T15:04:47Z

README.md

-| `ignorePodsWithoutPDB`    |`bool`|`false`| set whether pods without PodDisruptionBudget should be evicted or ignored                                                   |
-
-### Example policy
+| Name                      | Type                     | Default Value | Description                                                                                                                                                                                                           |


see https://github.com/googs1025/descheduler/tree/refator/evict_arg?tab=readme-ov-file#evictor-plugin-configuration-default-evictor

This can see more clearer.

ingvagabund · 2025-05-23T19:33:23Z

Apologies for the delays. I will not be able to finish the review. I am leaving for a vacation until June 8. I will resume once I am back.

Signed-off-by: googs1025 <[email protected]>

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refactor: separate eviction constraints to constraints.go #1693

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follow-up feature: refactor DefaultEvictorArgs for more clear config #1664

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add EvictionProtection filed for DefaultEvictorArgs

09c9970

Signed-off-by: googs1025 <[email protected]>

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add PodProtections for DefaultEvictorArgs #1665

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add PodProtections for DefaultEvictorArgs #1665

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ingvagabund commented May 23, 2025

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