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fix(manager): add detailed message when deleting pdb is not allowed
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Longhorn 9183

Signed-off-by: Jian Wang <jian.wang@suse.com>
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@w13915984028 @ejweber
w13915984028 authored and ejweber committed Aug 14, 2024
1 parent bb12101 commit d34f2d9
Showing 1 changed file with 79 additions and 29 deletions.
108 changes: 79 additions & 29 deletions controller/instance_manager_controller.go
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Original file line number Diff line number Diff line change
Expand Up @@ -814,12 +814,13 @@ func (imc *InstanceManagerController) syncInstanceManagerPDB(im *longhorn.Instan
return nil
}

canDeletePDB, err := imc.canDeleteInstanceManagerPDB(im)
canDeletePDB, msg, err := imc.canDeleteInstanceManagerPDB(im)
if err != nil {
return err
}

if !canDeletePDB {
imc.logger.Infof("Node %v is marked unschedulable but removing %v PDB is blocked: %v ", im.Name, imc.controllerID, msg)
return nil
}

Expand All @@ -842,12 +843,13 @@ func (imc *InstanceManagerController) syncInstanceManagerPDB(im *longhorn.Instan
}

if clusterAutoscalerEnabled {
canDeletePDB, err := imc.canDeleteInstanceManagerPDB(im)
canDeletePDB, msg, err := imc.canDeleteInstanceManagerPDB(im)
if err != nil {
return err
}

if !canDeletePDB {
imc.logger.Debugf("Autoscaler is enabled but removing %v PDB for node %v is blocked: %v", im.Name, imc.controllerID, msg)
if imPDB == nil {
return imc.createInstanceManagerPDB(im)
}
Expand Down Expand Up @@ -920,52 +922,100 @@ func (imc *InstanceManagerController) deleteInstanceManagerPDB(im *longhorn.Inst
return nil
}

func (imc *InstanceManagerController) canDeleteInstanceManagerPDB(im *longhorn.InstanceManager) (bool, error) {
const ITERATE_NAME_LIMIT = 5

func formatInstanceMessage(im *longhorn.InstanceManager) string {
msg := ""
ieFormated := false
if len(im.Status.InstanceEngines) > 0 {
msg = fmt.Sprintf("InstanceEngines count %v", len(im.Status.InstanceEngines))
ieFormated = true
i := 0
// only fetch the key, format: pvc-546894e9-d41a-4e34-bfa8-a4442f8dce20-e-0
for k := range im.Status.InstanceEngines {
msg = msg + " " + k
if i++; i >= ITERATE_NAME_LIMIT {
break
}
}
}

if len(im.Status.Instances) > 0 {
if ieFormated {
msg = fmt.Sprintf("%v Instances count %v", msg, len(im.Status.Instances))
} else {
msg = fmt.Sprintf("Instances count %v", len(im.Status.Instances))
}
i := 0
for k := range im.Status.Instances {
msg = msg + " " + k
if i++; i >= ITERATE_NAME_LIMIT {
break
}
}
}

return msg
}

func formatReplicaMessage(rep []*longhorn.Replica) string {
limit := len(rep)
msg := fmt.Sprintf("count %v", limit)
if limit > ITERATE_NAME_LIMIT {
limit = ITERATE_NAME_LIMIT
}
for i := 0; i < limit; i++ {
msg = msg + " " + rep[i].Name
}
return msg
}

func (imc *InstanceManagerController) canDeleteInstanceManagerPDB(im *longhorn.InstanceManager) (bool, string, error) {
// If there is no engine instance process inside the engine instance manager,
// it means that all volumes are detached.
// We can delete the PodDisruptionBudget for the engine instance manager.
if im.Spec.Type == longhorn.InstanceManagerTypeEngine {
if len(im.Status.InstanceEngines)+len(im.Status.Instances) == 0 { // nolint: staticcheck
return true, nil
return true, "", nil
}
return false, nil
return false, fmt.Sprintf("some instances are still running %v", formatInstanceMessage(im)), nil
}

// Make sure that the instance manager is of type replica
if im.Spec.Type != longhorn.InstanceManagerTypeReplica && im.Spec.Type != longhorn.InstanceManagerTypeAllInOne {
return false, fmt.Errorf("the instance manager %v has invalid type: %v ", im.Name, im.Spec.Type)
return false, "", fmt.Errorf("the instance manager %v has invalid type: %v ", im.Name, im.Spec.Type)
}

// Must wait for all volumes detached from the current node first.
// This also means that we must wait until the PDB of engine instance manager
// on the current node is deleted
allVolumeDetached, err := imc.areAllVolumesDetachedFromNode(im.Spec.NodeID)
allVolumeDetached, msg, err := imc.areAllVolumesDetachedFromNode(im.Spec.NodeID)
if err != nil {
return false, err
return false, "", err
}
if !allVolumeDetached {
return false, nil
return false, fmt.Sprintf("some volumes are still attached %v", msg), nil
}

nodeDrainingPolicy, err := imc.ds.GetSettingValueExisted(types.SettingNameNodeDrainPolicy)
if err != nil {
return false, err
return false, "", err
}
if nodeDrainingPolicy == string(types.NodeDrainPolicyAlwaysAllow) {
return true, nil
return true, "", nil
}

replicasOnCurrentNode, err := imc.ds.ListReplicasByNodeRO(im.Spec.NodeID)
if err != nil {
if datastore.ErrorIsNotFound(err) {
return true, nil
return true, "", nil
}
return false, err
return false, "", err
}

if nodeDrainingPolicy == string(types.NodeDrainPolicyBlockForEviction) && len(replicasOnCurrentNode) > 0 {
// We must wait for ALL replicas to be evicted before removing the PDB.
return false, nil
return false, fmt.Sprintf("some replicas block eviction %v", formatReplicaMessage(replicasOnCurrentNode)), nil
}

targetReplicas := []*longhorn.Replica{}
Expand All @@ -987,7 +1037,7 @@ func (imc *InstanceManagerController) canDeleteInstanceManagerPDB(im *longhorn.I

pdbProtectedHealthyReplicas, err := imc.ds.ListVolumePDBProtectedHealthyReplicasRO(replica.Spec.VolumeName)
if err != nil {
return false, err
return false, "", err
}
for _, pdbProtectedHealthyReplica := range pdbProtectedHealthyReplicas {
if pdbProtectedHealthyReplica.Spec.NodeID != im.Spec.NodeID {
Expand All @@ -1005,45 +1055,45 @@ func (imc *InstanceManagerController) canDeleteInstanceManagerPDB(im *longhorn.I
replica.Spec.NodeID == im.Spec.NodeID

if !hasPDBOnAnotherNode && !isUnusedReplicaOnCurrentNode {
return false, nil
return false, fmt.Sprintf("replica %v has no pdb on another node", replica.Name), nil
}
}

return true, nil
return true, "", nil
}

func (imc *InstanceManagerController) areAllVolumesDetachedFromNode(nodeName string) (bool, error) {
detached, err := imc.areAllInstanceRemovedFromNodeByType(nodeName, longhorn.InstanceManagerTypeEngine)
func (imc *InstanceManagerController) areAllVolumesDetachedFromNode(nodeName string) (bool, string, error) {
detached, msg, err := imc.areAllInstanceRemovedFromNodeByType(nodeName, longhorn.InstanceManagerTypeEngine)
if err != nil {
return false, err
return false, msg, err
}
if !detached {
return false, nil
return false, msg, nil
}

detached, err = imc.areAllInstanceRemovedFromNodeByType(nodeName, longhorn.InstanceManagerTypeAllInOne)
detached, msg, err = imc.areAllInstanceRemovedFromNodeByType(nodeName, longhorn.InstanceManagerTypeAllInOne)
if err != nil {
return false, err
return false, msg, err
}
return detached, nil
return detached, msg, nil
}

func (imc *InstanceManagerController) areAllInstanceRemovedFromNodeByType(nodeName string, imType longhorn.InstanceManagerType) (bool, error) {
func (imc *InstanceManagerController) areAllInstanceRemovedFromNodeByType(nodeName string, imType longhorn.InstanceManagerType) (bool, string, error) {
ims, err := imc.ds.ListInstanceManagersByNodeRO(nodeName, imType, "")
if err != nil {
if datastore.ErrorIsNotFound(err) {
return true, nil
return true, "", nil
}
return false, err
return false, "", err
}

for _, im := range ims {
if len(im.Status.InstanceEngines)+len(im.Status.Instances) > 0 { // nolint: staticcheck
return false, nil
return false, formatInstanceMessage(im), nil
}
}

return true, nil
return true, "", nil
}

func (imc *InstanceManagerController) createInstanceManagerPDB(im *longhorn.InstanceManager) error {
Expand Down

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