[Feature] Parametrize Scheduling Graceful Duration

Author: ajanikow

CHANGELOG.md

@@ -20,6 +20,7 @@
 - (Maintenance) Update Go to 1.22.2
 - (Feature) Object Checksum
 - (Bugfix) Use Rendered Spec in case of scheduling compare
+- (Feature) Parametrize Scheduling Graceful Duration
 
 ## [1.2.39](https://github.com/arangodb/kube-arangodb/tree/1.2.39) (2024-03-11)
 - (Feature) Extract Scheduler API

README.md

@@ -198,6 +198,7 @@ Flags:
       --timeout.backup-upload duration                         The request timeout to the ArangoDB during uploading files (default 5m0s)
       --timeout.force-delete-pod-grace-period duration         Default period when ArangoDB Pod should be forcefully removed after all containers were stopped - set to 0 to disable forceful removals (default 15m0s)
       --timeout.k8s duration                                   The request timeout to the kubernetes (default 2s)
+      --timeout.pod-scheduling-grace-period duration           Default period when ArangoDB Pod should be deleted in case of scheduling info change - set to 0 to disable (default 15s)
       --timeout.reconciliation duration                        The reconciliation timeout to the ArangoDB CR (default 1m0s)
       --timeout.shard-rebuild duration                         Timeout after which particular out-synced shard is considered as failed and rebuild is triggered (default 1h0m0s)
       --timeout.shard-rebuild-retry duration                   Timeout after which rebuild shards retry flow is triggered (default 4h0m0s)

cmd/cmd.go

@@ -157,6 +157,7 @@ var (
 		backupArangoD               time.Duration
 		backupUploadArangoD         time.Duration
 		forcePodDeletionGracePeriod time.Duration
+		podSchedulingGracePeriod    time.Duration
 	}
 	operatorImageDiscovery struct {
 		timeout                time.Duration
@@ -226,6 +227,7 @@ func init() {
 	f.DurationVar(&operatorTimeouts.backupArangoD, "timeout.backup-arangod", globals.BackupDefaultArangoClientTimeout, "The request timeout to the ArangoDB during backup calls")
 	f.DurationVar(&operatorTimeouts.backupUploadArangoD, "timeout.backup-upload", globals.BackupUploadArangoClientTimeout, "The request timeout to the ArangoDB during uploading files")
 	f.DurationVar(&operatorTimeouts.forcePodDeletionGracePeriod, "timeout.force-delete-pod-grace-period", globals.DefaultForcePodDeletionGracePeriodTimeout, "Default period when ArangoDB Pod should be forcefully removed after all containers were stopped - set to 0 to disable forceful removals")
+	f.DurationVar(&operatorTimeouts.podSchedulingGracePeriod, "timeout.pod-scheduling-grace-period", globals.DefaultPodSchedulingGracePeriod, "Default period when ArangoDB Pod should be deleted in case of scheduling info change - set to 0 to disable")
 	f.DurationVar(&shutdownOptions.delay, "shutdown.delay", defaultShutdownDelay, "The delay before running shutdown handlers")
 	f.DurationVar(&shutdownOptions.timeout, "shutdown.timeout", defaultShutdownTimeout, "Timeout for shutdown handlers")
 	f.DurationVar(&operatorReconciliationRetry.delay, "operator.reconciliation.retry.delay", globals.DefaultOperatorUpdateRetryDelay, "Delay between Object Update operations in the Reconciliation loop")
@@ -294,6 +296,7 @@ func executeMain(cmd *cobra.Command, args []string) {
 	globals.GetGlobalTimeouts().BackupArangoClientTimeout().Set(operatorTimeouts.backupArangoD)
 	globals.GetGlobalTimeouts().BackupArangoClientUploadTimeout().Set(operatorTimeouts.backupUploadArangoD)
 	globals.GetGlobalTimeouts().ForcePodDeletionGracePeriodTimeout().Set(operatorTimeouts.forcePodDeletionGracePeriod)
+	globals.GetGlobalTimeouts().PodSchedulingGracePeriod().Set(operatorTimeouts.podSchedulingGracePeriod)
 
 	globals.GetGlobals().Retry().OperatorUpdateRetryDelay().Set(operatorReconciliationRetry.delay)
 	globals.GetGlobals().Retry().OperatorUpdateRetryCount().Set(operatorReconciliationRetry.count)

pkg/deployment/reconcile/plan_builder_member_pod_scheduling_failure.go

@@ -23,12 +23,14 @@ package reconcile
 import (
 	"context"
 	"reflect"
+	"time"
 
 	core "k8s.io/api/core/v1"
 
 	api "github.com/arangodb/kube-arangodb/pkg/apis/deployment/v1"
 	"github.com/arangodb/kube-arangodb/pkg/deployment/actions"
 	"github.com/arangodb/kube-arangodb/pkg/util"
+	"github.com/arangodb/kube-arangodb/pkg/util/globals"
 	"github.com/arangodb/kube-arangodb/pkg/util/k8sutil"
 )
 
@@ -38,6 +40,12 @@ func (r *Reconciler) createMemberPodSchedulingFailurePlan(ctx context.Context,
 	_ k8sutil.APIObject, spec api.DeploymentSpec, status api.DeploymentStatus, context PlanBuilderContext) api.Plan {
 
 	var p api.Plan
+
+	if globals.GetGlobalTimeouts().PodSchedulingGracePeriod().Get() == 0 {
+		// Scheduling grace period is not enabled
+		return nil
+	}
+
 	if !status.Conditions.IsTrue(api.ConditionTypePodSchedulingFailure) {
 		return p
 	}
@@ -55,6 +63,19 @@ func (r *Reconciler) createMemberPodSchedulingFailurePlan(ctx context.Context,
 			continue
 		}
 
+		if c, ok := m.Member.Conditions.Get(api.ConditionTypeScheduled); !ok {
+			// Action cant proceed if pod is not scheduled
+			continue
+		} else if c.LastTransitionTime.IsZero() {
+			// LastTransitionTime is not set
+			continue
+		} else {
+			if time.Since(c.LastTransitionTime.Time) <= globals.GetGlobalTimeouts().PodSchedulingGracePeriod().Get() {
+				// In grace period
+				continue
+			}
+		}
+
 		imageInfo, imageFound := context.SelectImageForMember(spec, status, m.Member)
 		if !imageFound {
 			l.Warn("could not find image for already created member")

pkg/deployment/resources/pod_inspector.go

@@ -393,6 +393,11 @@ func (r *Resources) InspectPods(ctx context.Context, cachedStatus inspectorInter
 				nextInterval = nextInterval.ReduceTo(recheckSoonPodInspectorInterval)
 			}
 		} else {
+			if memberStatus.Conditions.Update(api.ConditionTypeScheduled, false, "Pod is not scheduled", "") {
+				updateMemberStatusNeeded = true
+				nextInterval = nextInterval.ReduceTo(recheckSoonPodInspectorInterval)
+			}
+
 			if k8sutil.IsPodNotScheduledFor(pod, podScheduleTimeout) {
 				// Pod cannot be scheduled for to long
 				log.Str("pod-name", pod.GetName()).Debug("Pod scheduling timeout")

pkg/util/globals/global.go

@@ -29,6 +29,7 @@ const (
 	DefaultArangoDCheckTimeout                = time.Second * 2
 	DefaultReconciliationTimeout              = time.Minute
 	DefaultForcePodDeletionGracePeriodTimeout = 15 * time.Minute
+	DefaultPodSchedulingGracePeriod           = 15 * time.Second
 
 	BackupDefaultArangoClientTimeout = 30 * time.Second
 	BackupUploadArangoClientTimeout  = 300 * time.Second
@@ -61,6 +62,7 @@ var globalObj = &globals{
 		backupArangoClientTimeout:          NewTimeout(BackupDefaultArangoClientTimeout),
 		backupArangoClientUploadTimeout:    NewTimeout(BackupUploadArangoClientTimeout),
 		forcePodDeletionGracePeriodTimeout: NewTimeout(DefaultForcePodDeletionGracePeriodTimeout),
+		podSchedulingGracePeriod:           NewTimeout(DefaultPodSchedulingGracePeriod),
 	},
 	kubernetes: &globalKubernetes{
 		requestBatchSize: NewInt64(DefaultKubernetesRequestBatchSize),
@@ -147,6 +149,7 @@ type GlobalTimeouts interface {
 	Agency() Timeout
 
 	ForcePodDeletionGracePeriodTimeout() Timeout
+	PodSchedulingGracePeriod() Timeout
 
 	BackupArangoClientTimeout() Timeout
 	BackupArangoClientUploadTimeout() Timeout
@@ -156,13 +159,17 @@ type globalTimeouts struct {
 	requests, arangod, reconciliation, arangodCheck, agency, shardRebuild, shardRebuildRetry Timeout
 	backupArangoClientTimeout                                                                Timeout
 	backupArangoClientUploadTimeout                                                          Timeout
-	forcePodDeletionGracePeriodTimeout                                                       Timeout
+	forcePodDeletionGracePeriodTimeout, podSchedulingGracePeriod                             Timeout
 }
 
 func (g *globalTimeouts) ForcePodDeletionGracePeriodTimeout() Timeout {
 	return g.forcePodDeletionGracePeriodTimeout
 }
 
+func (g *globalTimeouts) PodSchedulingGracePeriod() Timeout {
+	return g.podSchedulingGracePeriod
+}
+
 func (g *globalTimeouts) Agency() Timeout {
 	return g.agency
 }