instanceset

package
v0.9.0-beta.23 Latest Latest
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 Go to latest Published: May 11, 2024 License: AGPL-3.0 Imports: 51 Imported by: 0

Documentation

Overview

Package instanceset is a general-purpose workload API designed to manage role-based stateful workloads, such as databases. Think of InstanceSet as an enhanced version of StatefulSet.

While the native StatefulSet in Kubernetes handles stateful workloads effectively, additional work is required when the workload pods have specific roles (e.g., leader/follower in etcd, primary/secondary in PostgreSQL, etc.).

InstanceSet provides the following features:

1. Role-based Update Strategy (Serial/Parallel/BestEffortParallel) 2. Role-based Access Mode (ReadWrite/Readonly/None) 3. Automatic Switchover 4. Membership Reconfiguration 5. Multiple Instance Templates 6. Specified Instance Scale In 7. In-place Instance Update

Index

Constants

View Source 
const (
	WorkloadsManagedByLabelKey = "workloads.kubeblocks.io/managed-by"
	WorkloadsInstanceLabelKey  = "workloads.kubeblocks.io/instance"

	RoleLabelKey       = "kubeblocks.io/role"
	AccessModeLabelKey = "workloads.kubeblocks.io/access-mode"

	LegacyRSMFinalizerName = "rsm.workloads.kubeblocks.io/finalizer"

	RoleUpdateMechanismVarName = "KB_RSM_ROLE_UPDATE_MECHANISM"
)
View Source 
const (
	// MaxPlainRevisionCount specified max number of plain revision stored in status.updateRevisions.
	// All revisions will be compressed if exceeding this value.
	MaxPlainRevisionCount = "MAX_PLAIN_REVISION_COUNT"

	FeatureGateIgnorePodVerticalScaling = "IGNORE_POD_VERTICAL_SCALING"
)
View Source 
const ControllerRevisionHashLabel = "controller.kubernetes.io/hash"

ControllerRevisionHashLabel is the label used to indicate the hash value of a ControllerRevision's Data.

View Source 
const (
	EventReasonInvalidSpec = "InvalidSpec"
)

Variables

View Source 
var (
	ErrContinue error
	ErrWait     = errors.New("wait")
	ErrStop     = errors.New("stop")
)
View Source 
var Codecs = serializer.NewCodecFactory(model.GetScheme())

Functions

func AddAnnotationScope 

func AddAnnotationScope(scope AnnotationScope, annotations map[string]string) map[string]string

AddAnnotationScope will add AnnotationScope defined by 'scope' to all keys in map 'annotations'.

func BuildInstanceTemplateRevision 

func BuildInstanceTemplateRevision(template *corev1.PodTemplateSpec, parent *workloads.InstanceSet) (string, error)

func BuildPodTemplate 

func BuildPodTemplate(its *workloads.InstanceSet, envConfigName string) *corev1.PodTemplateSpec

func ComposeRolePriorityMap 

func ComposeRolePriorityMap(roles []workloads.ReplicaRole) map[string]int

ComposeRolePriorityMap generates a priority map based on roles.

func ControllerRevisionName 

func ControllerRevisionName(prefix string, hash string) string

ControllerRevisionName returns the Name for a ControllerRevision in the form prefix-hash. If the length of prefix is greater than 223 bytes, it is truncated to allow for a name that is no larger than 253 bytes.

func DeepHashObject 

func DeepHashObject(hasher hash.Hash, objectToWrite interface{})

DeepHashObject writes specified object to hash using the spew library which follows pointers and prints actual values of the nested objects ensuring the hash does not change when a pointer changes.

func GenerateAllInstanceNames 

func GenerateAllInstanceNames(parentName string, replicas int32, templates []InstanceTemplate, offlineInstances []string) []string

func GenerateInstanceNames 

func GenerateInstanceNames(parentName, templateName string,
	replicas int32, ordinal int32, offlineInstances []string) ([]string, int32)

GenerateInstanceNames generates instance names based on certain rules: The naming convention for instances (pods) based on the Parent Name, InstanceTemplate Name, and ordinal. The constructed instance name follows the pattern: $(parent.name)-$(template.name)-$(ordinal).

func GenerateInstanceNamesFromTemplate 

func GenerateInstanceNamesFromTemplate(parentName, templateName string, replicas int32, offlineInstances []string) []string

func GetEnvConfigMapName 

func GetEnvConfigMapName(itsName string) string

func HashControllerRevision 

func HashControllerRevision(revision *apps.ControllerRevision, probe *int32) string

HashControllerRevision hashes the contents of revision's Data using FNV hashing. If probe is not nil, the byte value of probe is added written to the hash as well. The returned hash will be a safe encoded string to avoid bad words.

func IsInstanceSetReady 

func IsInstanceSetReady(its *workloads.InstanceSet) bool

IsInstanceSetReady gives InstanceSet level 'ready' state: 1. all instances are available 2. and all members have role set (if they are role-ful)

func IsPodUpdated 

func IsPodUpdated(its *workloads.InstanceSet, pod *corev1.Pod) (bool, error)

IsPodUpdated tells whether the pod's spec is as expected in the InstanceSet. This function is meant to replace the old fashion `GetPodRevision(pod) == updateRevision`, as the pod template revision has been redefined in instanceset.

func NewAssistantObjectReconciler 

func NewAssistantObjectReconciler() kubebuilderx.Reconciler

func NewControllerRevision 

func NewControllerRevision(parent metav1.Object,
	parentKind schema.GroupVersionKind,
	templateLabels map[string]string,
	data runtime.RawExtension,
	revision int64,
	collisionCount *int32) (*apps.ControllerRevision, error)

NewControllerRevision returns a ControllerRevision with a ControllerRef pointing to parent and indicating that parent is of parentKind. The ControllerRevision has labels matching template labels, contains Data equal to data, and has a Revision equal to revision. The collisionCount is used when creating the name of the ControllerRevision so the name is likely unique. If the returned error is nil, the returned ControllerRevision is valid. If the returned error is not nil, the returned ControllerRevision is invalid for use.

func NewDeletionReconciler 

func NewDeletionReconciler() kubebuilderx.Reconciler

func NewFixMetaReconciler 

func NewFixMetaReconciler() kubebuilderx.Reconciler

func NewReplicasAlignmentReconciler 

func NewReplicasAlignmentReconciler() kubebuilderx.Reconciler

func NewRevision 

func NewRevision(its *workloads.InstanceSet) (*apps.ControllerRevision, error)

func NewRevisionUpdateReconciler 

func NewRevisionUpdateReconciler() kubebuilderx.Reconciler

func NewStatusReconciler 

func NewStatusReconciler() kubebuilderx.Reconciler

func NewTreeLoader 

func NewTreeLoader() kubebuilderx.TreeLoader

func NewUpdatePlan 

func NewUpdatePlan(its workloads.InstanceSet, pods []*corev1.Pod, isPodUpdated func(*workloads.InstanceSet, *corev1.Pod) (bool, error)) updatePlan

func NewUpdateReconciler 

func NewUpdateReconciler() kubebuilderx.Reconciler

func ParseAnnotationsOfScope 

func ParseAnnotationsOfScope(scope AnnotationScope, scopedAnnotations map[string]string) map[string]string

ParseAnnotationsOfScope parses all annotations with AnnotationScope defined by 'scope'. the AnnotationScope suffix of keys in result map will be trimmed.

func ParseParentNameAndOrdinal 

func ParseParentNameAndOrdinal(s string) (string, int)

ParseParentNameAndOrdinal parses parent (instance template) Name and ordinal from the give instance name. -1 will be returned if no numeric suffix contained.

func SortPods 

func SortPods(pods []corev1.Pod, rolePriorityMap map[string]int, reverse bool)

SortPods sorts pods by their role priority e.g.: unknown -> empty -> learner -> follower1 -> follower2 -> leader, with follower1.Name > follower2.Name reverse it if reverse==true

func ValidateDupInstanceNames 

func ValidateDupInstanceNames[T any](instances []T, getNameFunc func(item T) string) error

Types

type AnnotationScope 

type AnnotationScope string

AnnotationScope defines scope that annotations belong to.

it is a common pattern to add annotations to extend the functionalities of K8s builtin resources.

e.g.: Prometheus will start to scrape metrics if a service has annotation 'prometheus.io/scrape'.

The InstanceSet has encapsulated K8s builtin resources like Service, Headless Service, Pod, ConfigMap etc. AnnotationScope specified a way to tell the InstanceSet controller which resource an annotation belongs to.

e.g.: let's say we want to add an annotation 'prometheus.io/scrape' with value 'true' to the underlying headless service. here is what we should do: add annotation 'prometheus.io/scrape' with an HeadlessServiceScope suffix to the RSM object's annotations field. 

kind: InstanceSet
metadata:
  annotations:
    prometheus.io/scrape.headless.its: true

the InstanceSet controller will figure out which objects this annotation belongs to, cut the suffix and set it to the right place: 

kind: Service
metadata:
  annotations:
    prometheus.io/scrape: true

const (
	// RootScope specifies the annotation belongs to the RSM object itself.
	// they will also be set on the encapsulated StatefulSet.
	RootScope AnnotationScope = ""

	// HeadlessServiceScope specifies the annotation belongs to the encapsulated headless Service.
	HeadlessServiceScope AnnotationScope = ".headless.its"

	// ServiceScope specifies the annotation belongs to the encapsulated Service.
	ServiceScope AnnotationScope = ".svc.its"

	// AlternativeServiceScope specifies the annotation belongs to the encapsulated alternative Services.
	AlternativeServiceScope AnnotationScope = ".alternative.its"

	// ConfigMapScope specifies the annotation belongs to the encapsulated ConfigMap.
	ConfigMapScope AnnotationScope = ".cm.its"
)

type InstanceTemplate 

type InstanceTemplate interface {
	GetName() string
	GetReplicas() *int32
}

type PodRoleEventHandler 

type PodRoleEventHandler struct{}

func (*PodRoleEventHandler) Handle 

func (h *PodRoleEventHandler) Handle(cli client.Client, reqCtx intctrlutil.RequestCtx, recorder record.EventRecorder, event *corev1.Event) error

type PodUpdatePolicy 

type PodUpdatePolicy string
const (
	NoOpsPolicy         PodUpdatePolicy = "NoOps"
	RecreatePolicy      PodUpdatePolicy = "Recreate"
	InPlaceUpdatePolicy PodUpdatePolicy = "InPlaceUpdate"
)

Source Files

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