WIP: ✨ Cluster Provider and cluster-aware controllers #2207

vincepri · 2023-02-21T21:44:33Z

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k8s-ci-robot · 2023-02-21T21:44:38Z

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This pull-request has been approved by: vincepri

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pkg/builder/controller.go

pkg/builder/controller_test.go

sbueringer · 2023-02-24T14:34:10Z

pkg/builder/controller_test.go

+			}
+			cluster1, err := mgr.LogicalClusterGetter()("cluster1")
+			Expect(err).NotTo(HaveOccurred())
+			Expect(cluster1.GetClient().Create(ctx, dep)).To(Succeed())


Q: Do I see correctly that you are creating a Deployment on Cluster1 and then get reconcile requests for Cluster1 and Cluster2?

I would have expected to only get one on Cluster1

Yeah it's mostly because under the hood it's returning the same testenv kubeconfig

At least for now, need to rework testenv a bit potentially to spin up multiple clusters

Makes sense. I guessed it is something like that

In case we don't want to adress this on this PR, let's add a TODO to make clear the currently tested/verified behavior is not the actual behavior

pkg/internal/controller/controller.go

pkg/manager/internal.go

pkg/manager/manager_test.go

pkg/controller/controller.go

pkg/handler/enqueue.go

alvaroaleman · 2023-02-25T18:56:13Z

pkg/internal/controller/controller.go

 )

 // Controller implements controller.Controller.
 type Controller struct {
 	// Name is used to uniquely identify a Controller in tracing, logging and monitoring.  Name is required.
 	Name string

+	// Cluster is the logical cluster that this controller is running against.
+	// +optional
+	Cluster logical.Name


I don't really understand why a controller would need to know anything about the cluster it runs against. It has eventsources and the events those emit contain the cluster. It should also be mentioned that a controller might be getting events from multiple clusters.

IMHO we should just add the cluster field based on the reconcile.Request into the logger (which is from what I can tell the only place where we use this)

pkg/manager/manager.go

pkg/reconcile/reconcile.go

vincepri · 2023-02-28T19:34:17Z

/test pull-controller-runtime-test

ncdc · 2023-03-03T17:41:48Z

pkg/manager/internal.go

 	{
 		// TODO(vincepri): Make this timeout configurable.
 		ctx, cancel := context.WithTimeout(ctx, 10*time.Second)
 		defer cancel()
 		var watchErr error
 		if err := wait.PollImmediateUntilWithContext(ctx, 1*time.Second, func(ctx context.Context) (done bool, err error) {
-			cfg, watchErr = cm.logicalAdapter.RESTConfig(name)
+			cl, watchErr = cm.logicalProvider.Get(ctx, name, cm.defaultClusterOptions, cluster.WithName(name))


Why both name and cluster.WithName(name)?

The last one just sets the option for cluster.New

Happy to rework it, I guess it's a bit weird 😄

Why poll rather than making Get blocking?

sbueringer

mostly just nits, but not entirely done with the review yet (pkg/manager is left)

sbueringer · 2023-03-08T11:44:23Z

examples/fleet/main.go

+// KindClusterProvider is a cluster provider that works with a local Kind instance.
+type KindClusterProvider struct{}
+
+func (k *KindClusterProvider) Get(ctx context.Context, name logical.Name, opts ...cluster.Option) (cluster.Cluster, error) {


Q: Might it be better if we end up with something like logicalcluster.Name or logical.ClusterName

Also in field names of structs like Builder:

cluster cluster.Cluster logicalName logical.Name

vs.

cluster cluster.Cluster logicalClusterName logicalcluster.Name

or if we want something shorter

cluster cluster.Cluster clusterName logicalcluster.Name

(Might be good to consistently stick with the same naming, e.g. Cluster is a Cluster, ClusterName is a logicalcluster.Name, mixing it up might lead to a bit of confusion, e.g. with req.Cluster)

IMO we should rename the repo to sigs.k8s.io/logicalcluster and change the package name to logicalcluster too. I also like clusterName as a short-hand for variables of type logicalcluster.Name.

@nikhita how would we do a repo rename?

Alternative, as suggested in other comments: get rid of the alias altogether and just use string. Am undecided. Have done that now locally in this branch. We lose type-safety, and replace it with naming convention of calling every formally logical cluster name clusterName.

examples/fleet/main.go

pkg/builder/controller.go

sbueringer · 2023-03-08T11:57:08Z

pkg/builder/controller.go

+			// If we're building a logical controller, raw watches are not allowed
+			// given that the cache cannot be validated to be coming from the same cluter.
+			// In the future, we could consider allowing this by satisfying a new interface
+			// that sets and uses the cluster.


Can you expand a bit on that?

Is it that the cache that we get from cluster.GetCache might be caching objects from another cluster than the one the channel belongs to? (this is the case for source.Channel, right?)

How does this fit with this godoc comment?

* Use Channel for events originating outside the cluster (eh.g. GitHub Webhook callback, Polling external urls).

I assume it's the case where folks are using Channel for something coming from a cluster? (which is not what we document, but of course possible)

+1, this makes it impossible to use sources that are not source.Kind

sbueringer · 2023-03-08T12:02:01Z

pkg/builder/controller_test.go

+			}
+			cluster1, err := mgr.LogicalClusterGetter()("cluster1")
+			Expect(err).NotTo(HaveOccurred())
+			Expect(cluster1.GetClient().Create(ctx, dep)).To(Succeed())


In case we don't want to adress this on this PR, let's add a TODO to make clear the currently tested/verified behavior is not the actual behavior

sbueringer · 2023-03-08T12:22:43Z

pkg/handler/enqueue_mapped.go

+
+func (e *enqueueRequestsFromMapFunc) DeepCopyFor(c cluster.Cluster) EventHandler {
+	return &enqueueRequestsFromMapFunc{
+		cluster:    c,


Wondering if we need to store the entire Cluster given that we only use the name.

Related: at least in EnqueueRequestForObject we could additionally store the ClusterName in an additional field to avoid the lookup for every event

(Not sure if the compiler optimizes it away, but still simplifies the implementation)

sbueringer · 2023-03-08T12:27:18Z

pkg/handler/enqueue_owner.go

+		mapper:       c.GetRESTMapper(),
+	}
+	if err := copy.parseOwnerTypeGroupKind(c.GetScheme()); err != nil {
+		panic(err)


Q: Are there cases where it would be good if DeepCopyFor could return an error?

sbueringer · 2023-03-08T12:31:16Z

pkg/internal/controller/controller.go

+
+func (w *watchDescription) DeepCopyFor(c cluster.Cluster) *watchDescription {
+	copy := &watchDescription{
+		predicates: w.predicates,


nit: This shares the predicates, right? Is that fine or is there any way we can copy them?

sbueringer · 2023-03-08T12:34:44Z

pkg/internal/controller/controller.go

+	// This covers the case where a Watch was added later to the controller.
+	if watchDesc.IsClusterAware() {
+		for _, cldesc := range c.clusters {
+			if err := c.startClusterAwareWatchLocked(cldesc, watchDesc); err != nil {


Q: Are cluster aware watches started here and in l.192? If yes and it's intentional do we have to ensure that c.clusters does not contain the "default" cluster? Or is that the responsibility of the provider?

sbueringer · 2023-03-08T12:37:00Z

pkg/internal/controller/controller.go

+	if watch == nil {
+		return nil
+	}
+	c.LogConstructor(nil).Info("Starting Cluster-Aware EventSource", "cluster", cldesc.Name(), "source", watch.src)


nit: not sure how watch.src is logged

pkg/manager/internal.go

sbueringer · 2023-03-08T14:42:36Z

pkg/manager/internal.go

+
+	// Disengage all the runnables.
+	for _, aware := range cm.logicalClusterAwareRunnables {
+		if err := aware.Disengage(c.ctx, c); err != nil {


nit: might make sense to collect error here to try removing it from as many runnables as possible and then return after the loop if we have some errors.

sbueringer · 2023-03-08T14:45:58Z

pkg/manager/internal.go

+						if _, err := cm.getLogicalCluster(ctx, event.Name); err != nil {
+							return err
+						}
+						cm.engageClusterAwareRunnables()


I wonder if we want to optimize this a bit in a follow-up to not always engage for all clusters, but just for the added/modified one.

Might become a problem with hundreds+ of clusters

sbueringer · 2023-03-08T14:49:34Z

pkg/manager/runnable_group.go

@@ -51,6 +51,15 @@ func newRunnables(baseContext BaseContextFunc, errChan chan error) *runnables {
 // The runnables added before Start are started when Start is called.
 // The runnables added after Start are started directly.
 func (r *runnables) Add(fn Runnable) error {
+	// For wrapped logical runnables, we need to unwrap them to get the underlying runnable.


nit: Do we still plan do implement something here or just leftover?

sbueringer · 2023-03-08T15:14:02Z

pkg/manager/internal.go

+	// that we schedule all the cluster aware runnables.
+	for name, cluster := range cm.logicalClusters {
+		for _, aware := range cm.logicalClusterAwareRunnables {
+			if err := aware.Engage(cluster.ctx, cluster); err != nil {


Wondering if this has to respect leader election as well

sbueringer · 2023-03-08T15:18:49Z

Great step forward!!

Sorry also a bunch of nits, I thought I might as well just comment on them while I see them

alvaroaleman · 2023-03-19T15:12:03Z

pkg/builder/controller.go

+			// If we're building a logical controller, raw watches are not allowed
+			// given that the cache cannot be validated to be coming from the same cluter.
+			// In the future, we could consider allowing this by satisfying a new interface
+			// that sets and uses the cluster.


+1, this makes it impossible to use sources that are not source.Kind

pkg/builder/controller.go

alvaroaleman · 2023-03-19T15:16:32Z

pkg/builder/controller.go

+	cluster          cluster.Cluster
+	logicalName      logical.Name


I don't understand these fields. The cluster is always set to the manager and logicalName is never set. Do you want to add a new WithCluster to the builder?

@vincepri where did you want to go with this?

alvaroaleman · 2023-03-19T15:17:53Z

pkg/cluster/cluster.go

 // Cluster provides various methods to interact with a cluster.
 type Cluster interface {
+	// Name returns the unique logical name of the cluster.
+	Name() logical.Name


Why not a string? I find the whole logical very confusing.

+1 the current naming with logical is pretty confusing

alvaroaleman · 2023-03-19T15:32:25Z

pkg/internal/controller/controller.go

+func (c *Controller) Engage(ctx context.Context, cluster cluster.Cluster) error {
+	c.mu.Lock()


This is basically a ControllerBuilder. Why do we add logic into the controller how to duplicate itself rather than keeping this in the Builder layer above? i.E.

type ControllerBuilder func(cluster.Cluster) (cancel func() error, err error) builder := builder.New(mgr).For(&myKind{}).ControllerBuilder(&MyReconciler{}) cancels := map[string]func() error{} for clusterName, cluster := range mgr.GetClusters() { cancel, err := builder(cluster) if err != nil { return err } cancels[clusterName] = cancel }

Adding this inside here is a) muddying the layers b) error prone if ppl change the controller in the future and miss the fact that everything has to be deepcopied in here

alvaroaleman · 2023-03-19T15:35:51Z

pkg/handler/enqueue_mapped.go

+			continue
+		}
+		// If the request doesn't specify a cluster, use the cluster from the context.
+		if req.Cluster == "" && e.cluster != nil {


Adding this kind of awareness into a custom mapper doesn't really make a lot of sense to me. It would only be useful in a controller that deals with multiple clusters, otherwise we don't need the distinction. Once we deal with multiple clusters, why would we only sometimes fill the Cluster field?

alvaroaleman · 2023-03-19T15:37:09Z

pkg/handler/enqueue_owner.go

@@ -197,3 +205,16 @@ func (e *enqueueRequestForOwner) getOwnersReferences(object metav1.Object) []met
 	// No Controller OwnerReference found
 	return nil
 }
+
+func (e *enqueueRequestForOwner) DeepCopyFor(c cluster.Cluster) EventHandler {


Same comment as in controller/source re keeping the builder layer above the thing

alvaroaleman · 2023-03-19T15:41:24Z

pkg/manager/internal.go

@@ -178,6 +196,9 @@ func (cm *controllerManager) Add(r Runnable) error {
 }

 func (cm *controllerManager) add(r Runnable) error {
+	if aware, ok := r.(cluster.AwareRunnable); ok {


I'd much prefer to add an explicit RunForEachCluster(builder func(cluster.Cluster)(Runnable, error) that we can document, rather than requiring ppl to be aware of an extension interface.

It also means that we can simply use the existing Runnable interface to start/stop as needed

As a sideeffect, this would address @sbueringer comment below re leader election

alvaroaleman · 2023-03-19T15:49:01Z

pkg/manager/internal.go

 	{
 		// TODO(vincepri): Make this timeout configurable.
 		ctx, cancel := context.WithTimeout(ctx, 10*time.Second)
 		defer cancel()
 		var watchErr error
 		if err := wait.PollImmediateUntilWithContext(ctx, 1*time.Second, func(ctx context.Context) (done bool, err error) {
-			cfg, watchErr = cm.logicalAdapter.RESTConfig(name)
+			cl, watchErr = cm.logicalProvider.Get(ctx, name, cm.defaultClusterOptions, cluster.WithName(name))


Why poll rather than making Get blocking?

alvaroaleman · 2023-03-19T15:57:15Z

pkg/manager/internal.go

+	return cm.defaultCluster.GetAPIReader()
+}
+
+func (cm *controllerManager) engageClusterAwareRunnables() {


All of this feels extremely complicated. How about:

cancels := map[string]func(){} clusterProvider.OnAdd(func(c cluster) error { for _, builder := range mgr.eachClusterRunnables { ctx, cancel := context.WithCancel(ctx) if err := mgr.Add(wrapRunnableWithCustomCtx(ctx, c)); err != nil { return err } c.GetCache().HasSynced() // maybe aggregate errs instead? runnable, err := builder(c); if err != nil { return err } if err := mgr.Add(wrapRunnableWithCustomCtx(ctx, runnable); err != nil { return err } cancels[cluster.Name() = cancel } }) func wrapRunnableWithCustomCtx(ctx context.Context,r Runnable) Runnable { return RunnableFunc(_ context.Context){ r(ctx) } } clusterProvider.OnDelete(func(name string){ for _, cancel := range cancels[name]{ cancel() } }

clusterProvider is what you call logicalProvider. I find the logical in there still confusing, to me that sounds like there must be a physicalProvider somewhere - But that distinction doesn't make sense for controller runtime.

Signed-off-by: Vince Prignano <vincepri@redhat.com>

k8s-ci-robot · 2023-07-05T19:50:50Z

@vincepri: The following tests failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
pull-controller-runtime-test	`dfeaa19`	link	true	`/test pull-controller-runtime-test`
pull-controller-runtime-apidiff	`dfeaa19`	link	false	`/test pull-controller-runtime-apidiff`

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k8s-ci-robot · 2023-07-27T00:47:32Z

PR needs rebase.

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vincepri mentioned this pull request Feb 22, 2023

⚠ Support shutdown watches dynamically (v2) #2159

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Community Meeting February 28, 2023 kcp-dev/kcp#2849

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vincepri changed the title ~~dnr: wip: logical cluster~~ WIP: ✨ Cluster Provider and cluster-aware controllers Mar 3, 2023

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Consider stabilizing the API and moving to v1 and beyond #2327

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✨ Cluster Provider and cluster-aware controllers

dfeaa19

Signed-off-by: Vince Prignano <vincepri@redhat.com>

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sttts mentioned this pull request Mar 25, 2024

✨ WIP: Cluster Provider and cluster-aware controllers #2726

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k8s-ci-robot closed this Apr 17, 2024

		func (c *Controller) Engage(ctx context.Context, cluster cluster.Cluster) error {
		c.mu.Lock()

WIP: ✨ Cluster Provider and cluster-aware controllers #2207

WIP: ✨ Cluster Provider and cluster-aware controllers #2207

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vincepri commented Feb 21, 2023

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