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rollingupdate.go
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rollingupdate.go
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// Unless explicitly stated otherwise all files in this repository are licensed
// under the Apache License Version 2.0.
// This product includes software developed at Datadog (https://www.datadoghq.com/).
// Copyright 2016-2019 Datadog, Inc.
package strategy
import (
"time"
corev1 "k8s.io/api/core/v1"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
intstrutil "k8s.io/apimachinery/pkg/util/intstr"
"sigs.k8s.io/controller-runtime/pkg/client"
datadoghqv1alpha1 "github.com/datadog/extendeddaemonset/pkg/apis/datadoghq/v1alpha1"
"github.com/datadog/extendeddaemonset/pkg/controller/extendeddaemonsetreplicaset/conditions"
"github.com/datadog/extendeddaemonset/pkg/controller/extendeddaemonsetreplicaset/strategy/limits"
"github.com/datadog/extendeddaemonset/pkg/controller/utils"
podutils "github.com/datadog/extendeddaemonset/pkg/controller/utils/pod"
)
// ManageDeployment used to manage ReplicaSet in rollingupdate state
func ManageDeployment(client client.Client, params *Parameters) (*Result, error) {
result := &Result{}
// remove canary node if define
for _, nodeName := range params.CanaryNodes {
delete(params.PodByNodeName, params.NodeByName[nodeName])
}
now := time.Now()
metaNow := metav1.NewTime(now)
var desiredPods, availablePods, readyPods, currentPods, oldAvailablePods, podsTerminating, nbIgnoredUnresponsiveNodes int32
allPodToCreate := []*NodeItem{}
allPodToDelete := []*NodeItem{}
nbNodes := len(params.PodByNodeName)
maxPodSchedulerFailure, err := intstrutil.GetValueFromIntOrPercent(params.Strategy.RollingUpdate.MaxPodSchedulerFailure, nbNodes, true)
if err != nil {
params.Logger.Error(err, "unable to retrieve maxPodSchedulerFailure from the strategy.RollingUpdate.MaxPodSchedulerFailure parameter")
return result, err
}
for node, pod := range params.PodByNodeName {
desiredPods++
if pod == nil {
allPodToCreate = append(allPodToCreate, node)
} else {
if podutils.HasPodSchedulerIssue(pod) && int(nbIgnoredUnresponsiveNodes) < maxPodSchedulerFailure {
nbIgnoredUnresponsiveNodes++
continue
}
if !compareCurrentPodWithNewPod(params, pod, node) {
if pod.DeletionTimestamp == nil {
allPodToDelete = append(allPodToDelete, node)
} else {
podsTerminating++
continue
}
if podutils.IsPodAvailable(pod, 0, metaNow) {
oldAvailablePods++
}
} else {
currentPods++
if podutils.IsPodAvailable(pod, 0, metaNow) {
availablePods++
}
if podutils.IsPodReady(pod) {
readyPods++
}
}
}
}
// Retrieves parameters for calculation
maxUnavailable, err := intstrutil.GetValueFromIntOrPercent(params.Strategy.RollingUpdate.MaxUnavailable, nbNodes, true)
if err != nil {
params.Logger.Error(err, "unable to retrieve maxUnavailable pod from the strategy.RollingUpdate.MaxUnavailable parameter")
return result, err
}
params.Logger.V(1).Info("Parameters", "nbNodes", nbNodes, "createdPod", currentPods, "nbPodReady", readyPods, "availablePods", availablePods, "oldAvailablePods", oldAvailablePods, "maxUnavailable", maxUnavailable, "nbPodToCreate", len(allPodToCreate), "nbPodToDelete", len(allPodToDelete), "podsTerminating", podsTerminating)
rollingUpdateStartTime := getRollingUpdateStartTime(¶ms.Replicaset.Status, now)
maxCreation, err := calculateMaxCreation(¶ms.Strategy.RollingUpdate, nbNodes, rollingUpdateStartTime, now)
if err != nil {
params.Logger.Error(err, "error during calculateMaxCreation execution")
return result, err
}
limitParams := limits.Parameters{
NbNodes: nbNodes,
NbPods: int(currentPods),
NbAvailablesPod: int(availablePods),
NbOldAvailablesPod: int(oldAvailablePods),
NbCreatedPod: int(currentPods),
MaxUnavailablePod: maxUnavailable,
MaxPodCreation: maxCreation,
}
nbPodToCreate, nbPodToDelete := limits.CalculatePodToCreateAndDelete(limitParams)
nbPodToDeleteWithConstraint := utils.MinInt(nbPodToDelete, len(allPodToDelete))
nbPodToCreateWithConstraint := utils.MinInt(nbPodToCreate, len(allPodToCreate))
params.Logger.V(1).Info("Pods actions with limits", "nbPodToDelete", nbPodToDelete, "nbPodToCreate", nbPodToCreate, "nbPodToDeleteWithConstraint", nbPodToDeleteWithConstraint, "nbPodToCreateWithConstraint", nbPodToCreateWithConstraint)
result.PodsToDelete = allPodToDelete[:nbPodToDeleteWithConstraint]
result.PodsToCreate = allPodToCreate[:nbPodToCreateWithConstraint]
{
result.NewStatus = params.NewStatus.DeepCopy()
result.NewStatus.Status = string(ReplicaSetStatusActive)
result.NewStatus.Desired = desiredPods
result.NewStatus.Ready = readyPods
result.NewStatus.Current = currentPods
result.NewStatus.Available = availablePods
result.NewStatus.IgnoredUnresponsiveNodes = nbIgnoredUnresponsiveNodes
}
// Populate list of unscheduled pods on nodes due to resource limitation
result.UnscheduledNodesDueToResourcesConstraints = manageUnscheduledPodNodes(params.UnscheduledPods)
// Cleanup Pods
result.NewStatus, result.Result, err = cleanupPods(client, params.Logger, result.NewStatus, params.PodToCleanUp)
if result.NewStatus.Desired != result.NewStatus.Ready {
result.Result.Requeue = true
}
return result, err
}
func getRollingUpdateStartTime(status *datadoghqv1alpha1.ExtendedDaemonSetReplicaSetStatus, now time.Time) time.Time {
if status == nil {
return now
}
cond := conditions.GetExtendedDaemonSetReplicaSetStatusCondition(status, datadoghqv1alpha1.ConditionTypeActive)
if cond == nil {
return now
}
if cond.Status == corev1.ConditionTrue {
return cond.LastTransitionTime.Time
}
return now
}
func calculateMaxCreation(params *datadoghqv1alpha1.ExtendedDaemonSetSpecStrategyRollingUpdate, nbNodes int, rsStartTime, now time.Time) (int, error) {
startValue, err := intstrutil.GetValueFromIntOrPercent(params.SlowStartAdditiveIncrease, nbNodes, true)
if err != nil {
return 0, err
}
rollingUpdateDuration := now.Sub(rsStartTime)
nbSlowStartSlot := int(rollingUpdateDuration / params.SlowStartIntervalDuration.Duration)
result := (1 + nbSlowStartSlot) * startValue
if result > int(*params.MaxParallelPodCreation) {
result = int(*params.MaxParallelPodCreation)
}
return result, nil
}