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feat(operator): export Global Router pools through the Multi-Cluster Services API - #17412
The operator step of the pool discovery DEP (#17600): the operator creates the ServiceExports that announce a Global Router pool to other clusters, for the Global Discovery Service's MCS backend (#17331, #17332).
Since the first review
The DynamoPoolRelay controller (feat(operator): deploy active-active PoolRelay for one DGD #17347) maintains the exports, in place of a reconciler in the DGD controller. The DGD controller is unchanged, and the DGD gets no condition: the operator reports problems as Warning events on the DynamoPoolRelay.
The relay owns the exports, and they follow the relay's own Service.
A terminal workload error no longer stops the exports' retries: the DynamoPoolRelay controller, which returns no terminal errors, retries a failed export write with backoff.
A repair is a server-side apply of only the fields that the controller writes, and a withdrawal is a delete. Both carry the UID and resourceVersion of the export whose controller was checked.
The controller watches the cluster ID ClusterProperty through the cache, instead of reading it from the API server at most once a minute. A namespace-restricted install now reads it through a separate ClusterRole, so it gets the check too.
What it does
Set multiCluster.mcsImplementation (Helm: dynamo-operator.dynamo.multiCluster.mcsImplementation) to mcs or karmada. Then, for each DynamoPoolRelay that it publishes, the DynamoPoolRelay controller exports the pool, the DGD with the relay's name. It creates a ServiceExport for:
<DGD name>-pool-relay, the PoolRelay Service that the DynamoPoolRelay creates;
the Service of each frontend component, named as the operator names it: <DGD name>-<component name>, lowercased, with dots replaced by dashes. The Global Discovery Service finds frontends by a Service name suffix, -frontend by default, which matches a component named Frontend.
The relay is each export's controller, so garbage collection deletes the exports with the relay. Whenever the controller withdraws the relay's Service, it withdraws the exports too: when the DGD is deleted or terminating, does not use Kubernetes pod discovery, has no workers or uses the shared global Dynamo namespace, when the relay's configuration is invalid, and when another owner controls one of the relay's resources. The relay's Ready condition gives the reason. A DGD created again under the relay's name is exported again, and renaming or removing a frontend component withdraws that component's export.
The controller reconciles the exports after it renders the relay, whether or not the relay's own resources then apply. A failed export write is returned for controller-runtime to retry with backoff, and recorded as an ExportFailed Warning event. The DGD controller does not touch exports, so the DGD's workload errors, terminal or not, do not hold them back.
When someone changes the DGD label or the controller reference of an export that the relay controls, the controller restores them with a server-side apply of only those fields. The apply carries the UID and resourceVersion of the export whose controller was checked, so the API server refuses it if the export changed hands or was deleted since, and the change's watch event requeues the relay. A withdrawal deletes with the same UID and resourceVersion preconditions.
A ServiceExport that the relay does not control, such as one a user created, is neither adopted, repaired nor deleted. Once it is deleted, the relay creates its own. An export that is being deleted is left alone until it is gone, and then created again.
Empty, the default, exports nothing, and the controller neither watches nor writes exports. Pools discovered without Kubernetes are not affected.
A new feature gate, multiClusterExport, resolves at startup and returns the version at which the cluster serves ServiceExports, v1alpha1; every list, create, apply, delete and watch of an export uses it. As with other integrations that are enabled explicitly, setting an implementation in a cluster without the multicluster.x-k8s.io/v1alpha1ServiceExport API fails startup.
ServiceExports are read through the manager's cache, which the controller's watch fills; the manager's client would read these unstructured objects from the API server. An export's creation or deletion, or an update while it has a controller, requeues the relay that controls it and each relay whose DGD exports a Service of its name.
Warning events instead of a condition
The DGD's status is unchanged. The controller records the problems that only the operator can see as Warning events on the DynamoPoolRelay: InvalidServiceName, ServiceNameTooLong, NoFrontend, ClusterIDMismatch and ExportFailed. Normal events record each export that it creates, repairs or deletes. Each event names a related object: the export, or the DGD or ClusterProperty that its problem is about, at the version read. The events API counts events with the same object, reason, action and related object as repeats, whatever their notes. The MCS implementation reports on each export in the export's own status, which the operator does not read.
Cluster ID check. With mcs, the controller compares the DynamoPoolRelay's clusterId with the cluster's ID in its ClusterSet, which the About API's ClusterPropertycluster.clusterset.k8s.io holds, and records ClusterIDMismatch when they differ. The Global Discovery Service joins a pool's registration to its import only when they match. The controller watches the property, so creating, changing or deleting it requeues every relay. Without the property the check is skipped; a failed read, such as a Forbidden one, is an ExportFailed error that is retried. As for DeviceClasses and Queues, a separate ClusterRole grants the read in every install, because a namespace-restricted install's Role cannot grant a cluster-scoped kind.
Karmada and standard MCS
clusterId. The Global Discovery Service matches a pool's registration to its imports by the name that the implementation gives the cluster (feat(global-router): read pool models from registrations, not a file #17332). So set the DynamoPoolRelay's clusterId to that name: the About API cluster ID with standard MCS, or the member cluster name with Karmada.
The same ServiceExport. Karmada's ServiceExport controller (v1.19.0, pkg/controllers/mcs/service_export_controller.go) watches the SIG Multicluster ServiceExport in member clusters. So for both, the export sits next to its Service in the workload cluster, and the operator needs no access to the Karmada control plane. Karmada's own MultiClusterService (networking.karmada.io) lives on the control plane, which the operator cannot reach.
Karmada's name limit is 55. Karmada labels each collected slice kubernetes.io/service-name: derived-<service>, and a label value has at most 63 characters. With karmada, the operator skips a longer Service name and records ServiceNameTooLong; for -pool-relay that means a DGD name of at most 44 characters. Standard MCS has no such limit. The Global Discovery Service in feat(global-router): add the Global Discovery Service library (contract and backends) #17331 uses the same limit.
Karmada needs one propagated export per member. Karmada watches a member's ServiceExports only while its control plane has propagated at least one ServiceExport there, including after Karmada restarts. Keep one in place in each member; that setup is outside the operator.
No CRD changes. A DynamoPoolRelay marks the pool, so the DGD needs neither an annotation nor a field, and its status is unchanged.
OperatorConfiguration gains multiCluster.mcsImplementation. That type has one version and no conversion, so conversion is not affected.
Open points
Clearing mcsImplementation leaves existing exports in place until their DynamoPoolRelays are deleted. Cleaning them up would need an API read on every reconcile, or the export watch with the feature off.
The About API version. The operator reads ClusterProperty at about.k8s.io/v1alpha1. The About API's current CRD (kubernetes-sigs/about-api) stores v1beta1 and still serves v1alpha1; once a release stops serving v1alpha1, the cluster ID check turns off without a warning. Whether the check runs is also decided when the operator starts, so installing the About API later needs a restart. Resolving the served version at startup, as the gate does for ServiceExport, would fix the first, and a log line when the check is off would show both.
The operator could set the DynamoPoolRelay's clusterId from the About API instead of only checking it.
The rule that names a component's Service lives in the three Service generators and in the export. A shared helper would keep them together, but it needs a refactor of those generators.
Operator tests, as make test runs them (unit and envtest): all 50 packages pass. The export tests:
The export logic, each case reconciled twice with its events counted:
a pool exports its PoolRelay and frontend Services;
each frontend component's Service is exported under its own name;
a renamed frontend's export moves to its new Service;
a pool without a frontend exports its PoolRelay Service and warns NoFrontend;
a frontend Service name that no Service can have is not exported;
a user's export is neither adopted nor deleted, and another relay's is left alone;
Karmada skips a name that it cannot import, which standard MCS exports, and withdraws the relay's export of such a name;
same-named exports in another namespace do not count.
Withdrawal and repair:
a withdrawal skips an export already being deleted, a user's and another relay's, and an export already gone is no error;
an export being deleted is not repaired.
Full reconciles of the DynamoPoolRelay controller:
publishing creates the exports;
deleting the DGD withdraws them and keeps the relay;
a new DGD of the relay's name is exported;
a DGD without workers withdraws them;
a failed Deployment does not hold them back;
an ownership conflict withdraws them;
Reconcile returns a failed export write, with no requeue result.
Writes:
exports are listed, created and withdrawn at the version that the gate resolved;
a stale cache (AlreadyExists) is no error;
a failed create or delete is returned, recorded as ExportFailed, and converges on the retry.
Repairs:
a missing DGD label, one naming another DGD, and a controller reference that no longer blocks the relay's deletion are restored on the same export, which keeps its other fields;
a second reconcile writes nothing;
an export that a user took over after the cache read it stays theirs;
a repair never creates a deleted export again;
a withdrawal's stale delete is refused after a user removed the controller reference, or another relay took the export over.
Events: each event names its export, or the DGD or ClusterProperty that its problem is about.
The cluster ID:
the same ID, another ID, no property, a property without a value, no watch, and a failed read, which fails the reconcile;
through the watch, two pools follow the property as it changes, is deleted and is created again;
reading the property treats a missing property or About API as none, and a Forbidden or other failure as an error.
Startup:
the ClusterProperty watch is added only with standard MCS in a cluster that serves the About API;
a failed discovery fails the start;
features.New turns the gate on for a configured implementation.
The watch mappings and predicates, including:
an export that another kind controls;
a same-named Service in another namespace;
a namespace-restricted operator that still sees the cluster-scoped ClusterProperty.
Four envtests against a real API server:
A replaced DGD: an export deletion that an MCS finalizer holds, DGD status updates that write nothing, and a DGD replaced while the controller is stopped.
Retries: a failed export write is retried once the relay is Ready, when only the retries of the failed reconciles can requeue it.
Another version: a cluster that serves ServiceExports only at v1beta1, with the gate resolved to it.
A namespace-restricted operator: the cluster-scoped ClusterProperty's events reach it, with a separate event per export and per cluster ID.
Guard-breaking pass: it broke 100 guards in the export code one at a time, and ran the tests on each.
99 make a test fail. The other, the UID precondition on delete, is implied by the resourceVersion precondition beside it.
The broken guards include:
the version passed to every list, create, apply, delete and watch;
ownership on repair and withdrawal, and exports being deleted;
the Service name checks;
the related object of each event;
the cluster ID check and its watch;
the watch mappings, predicates and namespace filter;
the error and result that Reconcile returns;
the gate's resolution, and config validation.
Adversarial review against the Global Router coding standards, run on b150cae. Its verified findings are fixed:
the events of different exports merged into one, and ClusterIDMismatch kept stale IDs;
the PoolRelay page did not say what clusterId must be with Karmada, gave an InvalidServiceName example that cannot happen, and overstated what a repair restores;
the retry envtest would pass without a retry.
Left as they are:
moving the export writes behind internal/multicluster, and the pool's Service naming into poolrelay;
a metadata-only ServiceExport watch, which would save little for a few small objects.
make manifests adds multicluster.x-k8s.ioserviceexports (create, delete, get, list, patch, watch) and about.k8s.ioclusterproperties (get, list, watch) to role.yaml. gen_kubernetes_api.py --check and make generate-helm-docs show no drift. The PoolRelay page documents the exports and their events, and the curated DGD page no longer covers them.
The platform chart's make test: 18 suites and 83 tests pass, and 8 Python tests.
golangci-lint v2.15.0: 0 issues. The docs lint: 0 errors. pre-commit passes on the changed files.
Global Router pools can now export their pool-relay and frontend Services through the MCS or Karmada implementation when the operator is configured and the deployment is annotated.
Exports are withdrawn when the annotation is removed and deleted with the deployment. Existing exports not managed by the deployment are left unchanged.
The operator requires the ServiceExport API; Karmada exports are limited to Services with names of up to 55 characters.
Documentation
Added configuration and deployment guidance for multi-cluster exports.
…Services API
With multiCluster.mcsImplementation set to mcs or karmada, the operator
creates a multicluster.x-k8s.io/v1alpha1 ServiceExport for the
<DGD>-pool-relay and <DGD>-frontend Services of each DGD annotated
nvidia.com/global-router-pool: "true". The DGD owns the exports, and
removing the annotation withdraws them. Karmada reads the same
ServiceExport in member clusters; with karmada the operator skips a
Service name longer than 55 characters, which Karmada cannot import.
A new feature gate, multiClusterExport, verifies the ServiceExport API at
startup. Each workload program reconciles the exports after its
workloads, and a watch on ServiceExports requeues the DGDs that export a
Service of that name.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Signed-off-by: Anna Tchernych <atchernych@nvidia.com>
1 job failed: the vLLM snapshot vCluster setup timed out installing the vcluster-hpm hostpath-mapper because 2 of its DaemonSet pods never started on GPU nodes (infrastructure); no tests ran.
ready.go:336: [debug] DaemonSet is not ready: gh-id-41586388358-checkpoint-vllm-dt/vcluster-hpm-hostpath-mapper. 4 out of 5 expected pods are ready
wait.go:87: [debug] Error received when checking status of resource vcluster-hpm-hostpath-mapper. Error: 'client rate limiter Wait returned an error: context deadline exceeded'
Error: context deadline exceeded
##[error]Process completed with exit code 1.
### VCLUSTER OPERATOR DEPLOYMENT FAILED
NAME READY STATUS RESTARTS AGE NODE
vcluster-hpm-hostpath-mapper-6hx9t 0/1 Pending 0 10m aks-a100b-21135548-vmss000001
vcluster-hpm-hostpath-mapper-b75gq 0/1 Pending 0 10m aks-a100a-56471985-vmss000002
vcluster-hpm-hostpath-mapper-k9jjz 1/1 Running 0 10m aks-a100a-56471985-vmss000003
helm upgrade --install vcluster-hpm ... --wait --timeout 10m timed out: the hostpath-mapper DaemonSet pods on aks-a100b-21135548-vmss000001 and aks-a100a-56471985-vmss000002 were scheduled but stayed Pending for 10 minutes. Their only event is Scheduled, with no image pull or container start. The vCluster itself was running and no Dynamo operator or test steps ran. This is a cluster/node infrastructure issue, and rerunning the failed jobs is likely enough.
`MultiClusterConfiguration` and `MCSImplementation` add two types to
operator.config.dynamo.nvidia.com/v1alpha1, so the generated API
reference test's baseline goes from 29 to 31.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Signed-off-by: Anna Tchernych <atchernych@nvidia.com>
Fixes from a review of this PR:
- A failed ServiceExport create or delete no longer marks a serving DGD
Failed. The export step ran inside each workload program, whose error
path sets the DGD's state to failed. It now runs in the outer
reconcile: a failure is logged, recorded as a Warning event, and
retried within 30 s, and the DGD's status is left to its workloads.
- Removing the pool annotation now withdraws the exports even when the
workloads fail or the DGD is rejected, since the step runs before
those paths return early.
- A Service name too long for the MCS implementation is recorded as a
Warning event, not only logged.
- `nvidia.com/global-router-pool` reads `true` in any case, as the DGD's
other boolean annotations do.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Signed-off-by: Anna Tchernych <atchernych@nvidia.com>
The DynamoPoolRelay controller from main names its Service
<DGD name>-pool-relay, the name the pool exports use. It now builds that
name from multicluster.PoolRelayServiceSuffix, so the export cannot point
at a Service the relay does not create. The DGD page and the suffix's
comment say which resource creates each exported Service.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Signed-off-by: Anna Tchernych <atchernych@nvidia.com>
The operator configuration now selects the MCS or Karmada implementation. When enabled and a DGD has the Global Router pool annotation, the operator reconciles ServiceExports for its pool-relay and frontend Services. The changes also add API discovery, service-name limits, retry handling, Helm configuration, and reference documentation.
The operator API and Helm chart expose and validate the MCS implementation setting. Feature detection checks for the ServiceExport API. Tests and API references cover the supported configuration values and requirements.
Pool service identification and export data deploy/operator/internal/consts/consts.go, deploy/operator/internal/multicluster/*, deploy/operator/internal/controller/poolrelay/controller.go
The operator identifies annotated pool DGDs, derives normalized pool-relay and frontend service names, applies implementation-specific name limits, and constructs ServiceExport data. The pool-relay controller uses the shared service-name suffix.
The DGD controller creates eligible exports, withdraws DGD-owned exports, maps ServiceExport events to DGDs, and schedules retries. Controller and Helm RBAC include ServiceExport permissions. Tests cover reconciliation and retry behavior; the DGD reference documents export conditions and cleanup.
Custom-named frontends will not be exported through MCS. The impact is limited to those deployments, but their export naming should be corrected before relying on the feature for them.
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Docstring coverage is 37.50% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff with cyclomatic complexity of at least 2. Documenta…
Write docstrings for the functions missing them to satisfy the coverage threshold.
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The title "feat(operator): export Global Router pools through the Multi-Cluster Services API" matches the main change. The changeset adds operator support that creates DGD-owned ServiceExports for poo…
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The description is thorough and substantive. It opens with a summary linking the DEP and related issues, then covers what the change does, API and conversion impact, open points, and a detailed valida…
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The title "feat(operator): export Global Router pools through the Multi-Cluster Services API" matches the main change. The changeset adds operator support that creates DGD-owned ServiceExports for pool-relay and frontend Services when mcsImplementation is set to mcs or karmada, and the PR objectives describe the same change. The title is specific and follows a conventional commit style. It is 81 characters, slightly above a short title, but it remains a single clear sentence.
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The description is thorough and substantive. It opens with a summary linking the DEP and related issues, then covers what the change does, API and conversion impact, open points, and a detailed validation section. It maps well to the spirit of the template, which calls for Overview, Key Changes, Validation, and Issues and Ongoing Work sections. It does not use the template's exact headings (it uses Summary, What it does, Karmada and standard MCS, API and conversion, Open points, Validation), and it does not include the 'Closes #XXXX' issue link or the Pull Request Checklist details block. Those are the main gaps. The content itself is clear and complete, so the description is mostly complete.
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Docstring coverage is 37.50% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff with cyclomatic complexity of at least 2. Documentation-only edits and deletions within surviving functions are included; unchanged diff context and fully deleted functions are excluded. Analyzed 16 functions across 16 files. (8 skipped: 8 unsupported.)
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Write docstrings for the functions missing them to satisfy the coverage threshold.
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Review comments at @deploy/operator/internal/multicluster/serviceexport.go:
- Around line 50-57: Update ServiceNames to accept the generated frontend
Service name and return it as the frontend entry instead of deriving it from
FrontendServiceSuffix. Preserve the PoolRelay name generation and normalization.
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…exports
A DGD is now a Global Router pool while a DynamoPoolRelay of the same name
exists, in place of the nvidia.com/global-router-pool annotation, so the
PoolRelay Service that the export names always has a creator. The operator
exports the Service of each frontend component under the name it gives
that Service, not a fixed <DGD name>-frontend, and withdraws the export of
a frontend that was renamed or removed.
A new GlobalRouterPoolExported condition on the DGD reports the exports:
Exported, ExportConflict, ExportPending, ExportRejected,
InvalidServiceName, ServiceNameTooLong, NoFrontend, ClusterIDMismatch and
ExportFailed. It reads the Valid, Ready and Conflict conditions that the
MCS implementation writes (KEP-1645): Ready False with the reason Pending
is still pending, a conflict the implementation resolved keeps the pool
exported, and a standard implementation counts as pending until it
reports. Every status write carries the condition, including early
failures, so it never fails the DGD; a newly raised problem is also a
Warning event, and a failure before the DGD is known to be a pool leaves
the condition as it was.
With standard MCS, the operator compares the DynamoPoolRelay's clusterId
with the cluster's ID in its ClusterSet, read from the About API's
ClusterProperty without the cache at most once a minute, and skipped
without the property or the permission to read it.
ServiceExports are read through the manager's cache: its client reads
unstructured objects from the API server. The DGD controller now watches
DynamoPoolRelays and passes ServiceExport updates that change their status
or start their deletion. The PoolRelay controller names its Service with
multicluster.PoolRelayServiceName, the name the export uses.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Signed-off-by: Anna Tchernych <atchernych@nvidia.com>
…t on
The multiClusterExport gate now returns the multicluster.x-k8s.io version
at which the cluster serves ServiceExports, and Gates carries it as
ServiceExportVersion. The export reconciler, the ServiceExport watch, and
every list, create and delete use that version, through
multicluster.ServiceExportGroupKind and version arguments.
This follows the shape of #17606, which lets a cluster that serves only
v1beta1 export. The gate here still probes only v1alpha1, so behavior does
not change, and #17606 can add v1beta1 on top of this with its probe, its
tests and its docs.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Signed-off-by: Anna Tchernych <atchernych@nvidia.com>
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Two P2 reconciliation liveness issues are detailed inline: export retries can be lost on terminal workload errors, and the optional cluster-ID cache has no revalidation trigger. Reviewed at b53054e; no tests run.
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[P2] Preserve the export retry when workload reconciliation returns a terminal error
Trigger and failure path
This helper assumes that every non-nil error will cause controller-runtime to enqueue another attempt. That is not true for reconcile.TerminalError, which this controller can actually return: the outer provider-selection path returns it at line 182, the component program at dgd_component_program.go:86, and the Grove program at dgd_grove_program.go:137.
One concrete scenario is an existing pool with a durable Grove selection after the operator is restarted with Grove disabled. Removing its DynamoPoolRelay must still withdraw the exports, independently of the workload failure:
DynamoPoolRelay is removed
|
v
DGD reconcile
reconcilePoolExports
DELETE ServiceExport -> transient API/admission failure
poolExports.retry = true
|
v
workload program -> TerminalError("Grove is disabled")
|
v
retryPoolExports(result, err)
err != nil -> return result unchanged
|
v
controller-runtime sees TerminalError -> no retry
The failed delete produces no ServiceExport mutation/watch event. The DGD's status-only update is filtered by its primary predicate. After the transient API problem clears, there is therefore no guaranteed event to retry withdrawal: a DGD-owned export can remain published until an unrelated event or restart happens. The same issue applies to a failed export creation.
Required behavior
Export convergence needs an effective retry even when the workload side is terminal. Merely returning RequeueAfter alongside TerminalError will not fix it: the pinned controller-runtime v0.24.1 ignores the result for every non-nil error, and deliberately does not rate-limit/requeue terminal errors.
One local option is to normalize the terminal workload error only inside the existing poolExports.retry branch, after the workload failure has been persisted to DGD status:
if poolExports.retry {
- defer func() { result = retryPoolExports(result, err) }()+ defer func() {+ if errors.Is(err, reconcile.TerminalError(nil)) {+ err = nil+ }+ result = retryPoolExports(result, err)+ }()
}
This is an illustrative approach, not a request to suppress ordinary errors or status-persistence failures. The workload failure must remain visible in status; once export work converges, the existing terminal behavior can resume.
Regression coverage
Please combine a real terminal workload path with an injected export create/delete failure. After the API recovers, verify that another attempt is scheduled and the export converges without another user/dependency change. TestRetryPoolExports currently covers only an ordinary errors.New; it misses the distinction that causes this failure.
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[P2] Watch ClusterProperty changes instead of relying on a private TTL cache
Why this does not currently converge
The one-minute TTL only decides what a future call to get returns. It does not cause that future call. The DGD controller has no ClusterProperty watch, and a ClusterIDMismatch condition is returned without an error, so the export-error retry path does not schedule another reconcile either.
A concrete sequence is:
time ClusterProperty DynamoPoolRelay DGD condition
---- ---------------- ---------------- ------------------
t=0 east (cached) clusterId: east Exported
t=10s replaced with west clusterId: east no property watch
t=15s west clusterId: west relay watch fires
|
v
get() still returns cached east
|
v
ClusterIDMismatch
t=60s west clusterId: west TTL expires
|
X
nothing enqueues DGD
The actual inputs now agree, but the mismatch can remain indefinitely once the system becomes quiet. A property created after an earlier cached "absent" result has the same missing-trigger problem. If an ID read fails, declining to cache the error also does not help unless another reconcile is guaranteed.
This is a diagnostic convergence issue: the current check does not gate ServiceExport writes or workloads, but its DGD condition can remain wrong or fail to report an actual registration/import ID mismatch.
Required behavior: optional API detection + informer cache
Please use the normal cached, watch-driven reconciliation pattern for this API:
Detect whether the ClusterProperty API is served before registering its watch. This operator already handles optional APIs this way; for example, the InferencePool watch is registered only after REST mapping succeeds. The feature-gate setup also already uses detectAPIAvailability.
Add get;list;watch for about.k8s.io/clusterproperties to the RBAC markers and regenerate the role. Supply the cluster-scoped read permissions in supported installation modes. These permissions are a normal part of supporting this read-only cluster metadata API.
When the API is available, watch the relevant property's create, value-change and delete events, and enqueue all affected pools/DGDs. Reading a fresh ID while reconciling just one DGD does not update the other DGDs' persisted conditions.
Read the property from the manager's informer cache and remove this private TTL cache and its uncached APIReader read. Since the object is unstructured here, use the cache explicitly, as this PR already does for ServiceExports.
API served? -- no --> skip optional check; do not register informer
|
yes
v
ClusterProperty informer/cache
|
create / value change / delete
v
enqueue all affected pools -> read cached property -> recompute condition
Cluster scope and GET-only RBAC do not establish a correctness requirement for bypassing the cache; the RBAC can be extended. The legitimate optional case is an absent API (or absent property), rather than silently interpreting an unexpected Forbidden as "no cluster ID".
Regression coverage
Please exercise a stable pool whose property changes and whose relay ID is corrected: once the cache observes the new value, its condition should recover without another user change. Also cover a previously absent property being created, property deletion, multiple pools sharing the value, and startup when the optional API is absent.
TestClusterSetIDs currently advances the supplied clock and manually calls get again. That proves expiration behavior once invoked, but not that the controller will ever invoke it again. A cached-watch implementation should test the dependency event and queue behavior instead of preserving this TTL mechanism.
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Additional inline feedback from the SSA/ownership pass: add sparse SSA repair for existing DGD-owned ServiceExports, and protect ownership-sensitive withdrawal with UID plus resourceVersion. The new ServiceExport path contains no custom object merge; its current limitation is create-only convergence for existing resources. No tests run.
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Please add an SSA repair path for existing DGD-owned ServiceExports
Existing is not the same as reconciled
This branch skips every existing ServiceExport, including one controlled by this DGD. export() only performs Create, and the only other write is Delete. There is no apply/update path that can restore the desired fields on an existing owned object.
For example, remove or change the operator's nvidia.com/dynamo-graph-deployment-name label on an owned export. A subsequent DGD reconcile sees the name in existing and leaves it unchanged. Any later change to the operator's rendered export intent has the same limitation until someone deletes the object.
There is no custom object-merge algorithm in this new ServiceExport path, which is good. The missing piece is declarative repair of resources it already owns, not a need to introduce a handwritten read/merge/Update sequence.
Suggested ownership and apply contract
observed ServiceExport
|
+-- absent -----------------> exclusive Create
| AlreadyExists -> wait for cache
|
+-- controlled by this DGD --> sparse SSA of operator-owned fields
| fixed field manager; identity/version guard
|
+-- foreign / terminating ---> leave untouched / wait
Create-first is fine and preserves the current protection against adopting a same-name export created concurrently by a user. For an observed, nonterminating DGD-owned export, apply a minimal desired object: type/name/namespace, the operator's DGD label and its controller reference, with the observed identity/version retained to protect the ownership decision across races.
Do not copy the full live object into the apply intent. In particular, omit MCS/provider-owned status, finalizers, unrelated metadata and any optional spec fields that this operator does not intentionally own. If force ownership is needed to restore an owned field, keep the applied field set narrow and the foreign-object exclusion intact.
Please also let relevant changes to the fields this controller owns trigger reconciliation. serviceExportStateChanged currently admits status/deletion changes only; adding SSA without a metadata-drift trigger would still rely on unrelated DGD events to repair the label.
SSA requires patch, so the new ServiceExport RBAC marker and generated role need that verb too. The existing controller_common.SyncResource helper is not an SSA shortcut here: it uses custom copy/hash/update behavior.
Regression coverage
Change an owned field on an existing export and verify that reconciliation restores it without deleting/recreating the export. In the same test, retain provider status/finalizers and unrelated metadata. Keep the existing foreign-export preservation and stale-cache AlreadyExists cases.
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[P2] Guard the ownership decision with resourceVersion as well as UID
Same object, different owner
The UID precondition protects against a same-name replacement. It does not protect the preceding ownership check at line 241: the controller reference can change while the ServiceExport retains the same UID.
The PR explicitly promises not to delete exports the DGD does not own. A concrete race during withdrawal is:
DGD cache API server
--------- ----------
export:
uid: U
resourceVersion: R1
controllerUID: DGD-A
user removes/transfers controller reference
uid: U (unchanged)
resourceVersion: R2 (changed)
controllerUID: none / DGD-B
withdraw() checks DGD-A
DELETE with precondition uid=U -----------------------> accepted
now-foreign export is deleted
For example, a user can take ownership of a frontend export while removing its DynamoPoolRelay; the frontend Service can continue running, but this stale withdrawal deletes its now-user-managed export. The MCS provider then withdraws that Service from other clusters.
Required behavior
Preserve the observed resourceVersion in multicluster.Export and condition the delete on both UID and resourceVersion. This ties the destructive operation to the object version whose ownership was checked:
Treat a precondition conflict as retryable and re-evaluate ownership from the updated cache. Existing controller_common.SyncResource deletion already uses UID and resourceVersion preconditions. SSA for the create/repair path does not replace this delete guard.
Regression coverage
After the cached list is observed but before DELETE is issued, remove or transfer the controller reference without changing the export UID. Verify that the stale delete is rejected, a subsequent reconcile preserves the foreign export, and ordinary owned withdrawal still succeeds.
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Architecture follow-up: make DynamoPoolRelay the primary resource for export reconciliation, while independently SSA-writing only GlobalRouterPoolExported on the DGD if that aggregate condition is retained. Detailed lifecycle, field-ownership and validation requirements are inline.
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Keep export reconciliation outside the DGD controller; prefer no export condition on the DGD
The export lifecycle belongs to the relay
The rule introduced by this PR is that a pool's exports exist while its DynamoPoolRelay exists. The relay supplies the export intent and lifecycle. The DGD supplies workload information, including frontend Service names.
Calling the export reconciler from here makes the DGD workload controller responsible for MCS policy, dependency watches, export retries and export-condition composition. The terminal-error retry issue is a concrete consequence: an unrelated workload failure can suppress export convergence.
Please register export reconciliation with DynamoPoolRelay as its primary resource, and watch relevant DGD changes as dependencies. This can be a focused export controller alongside the existing relay deployment controller; controllers can observe the same primary resource without being combined into one reconciliation loop.
DynamoPoolRelay events -----------------------------+
DGD changes affecting exported Services ------------+--> export controller queue
ServiceExport state / owned-field changes -----------+ |
ClusterProperty changes, when API is available ------+ v
observe current state
|
v
reconcile ServiceExports
owner: DynamoPoolRelay
sparse SSA + safe deletion
DGD workload controller
-> workloads, rollout, workload status
-> no export-reconciliation call or export-specific retry/status plumbing
The export controller should own its generated exports through the relay. Relay deletion can then garbage-collect those exports. DGD deletion/absence must still explicitly withdraw exports while a relay remains; ownership by the relay alone does not cover that case.
I increasingly question adding this condition to the DGD at all
My preferred design is to omit GlobalRouterPoolExported from the DGD unless we have a concrete user-facing requirement for that aggregate status. This is more than indifference about where to put it: I am increasingly unconvinced that the workload object should carry this reverse-dependency status.
A Kubernetes Deployment does not acquire a condition because a Service selects its Pods or an Ingress routes traffic to them. Those separate resources describe how the workload is exposed. I would apply the same boundary here: attaching a relay/export feature to a DGD does not by itself make export health part of DGD status.
ServiceExports already expose the MCS implementation's per-export conditions. An additional DGD summary duplicates that information and adds aggregation, fan-out, cleanup and status-lifecycle coupling, even though it deliberately does not gate workload readiness. Extra diagnostics such as cluster-ID validation can remain with the export/relay integration rather than requiring a write into the DGD.
Whether an aggregate condition is useful is a design judgment, not a claim that such a condition is technically invalid. But I would ask for its concrete use case before adding this coupling, and would default to leaving DGD status alone.
If a justified DGD summary is retained, SSA-write only that one entry
The primary-resource choice and the status-projection target are independent. If a concrete use case justifies keeping the projection, it can remain exactly one condition type on the DGD: GlobalRouterPoolExported. Exported, ExportPending, ClusterIDMismatch, etc. are reasons, not additional condition types. Choosing the relay as primary does not require moving this condition to the relay.
Leave Ready, top-level status.observedGeneration, workload state, component status and rollout/restart status to their existing owners. Do not copy the live conditions list into the apply intent or add an export-condition merge to persistWorkloadProgramResult. Existing status writers must preserve other condition types. The projected condition uses DGD.Generation, and its lastTransitionTime should remain stable while its status is unchanged.
On relay disappearance, withdraw only this field manager's condition entry from any surviving DGD. Garbage-collecting exports does not remove a status projection on another resource. These requirements are conditional on retaining the summary; they are not an argument for adding it.
Regression coverage: the relay must survive DGD replacement
Please add a manager/cache regression for this sequence:
relay UID=R remains present throughout
DGD UID=A, valid configuration
|
v
DGD A is deleted -> exports / discoverable relay endpoint are withdrawn
|
v
DGD UID=B is created with the same namespace/name
and different frontend/source configuration
|
v
relay / exports converge on B without recreating the relay CR
Verify that the new DGD's configuration is used, obsolete exports are withdrawn, new exports are reconciled, and publication recovers without another user change. Include pending child deletion and a rapid replacement where the cache never exposed the intermediate absence; recovery must be level-based and must not depend on observing a particular delete/create event sequence.
Also cover export progress while DGD workload reconciliation is terminal, DGD dependency updates without a status-feedback loop, and cleanup when either the DGD or relay disappears. If the DGD condition is retained, verify its generation belongs to the replacement DGD and that interleaved writes preserve other controllers' condition/status fields.
The existing relay envtest checks withdrawal after DGD deletion but returns as soon as the Service disappears; it does not demonstrate successful republication after a same-name DGD with a new UID appears. This is a coverage requirement, not another confirmed P2.
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The PoolRelay controller already watches the matching DGD and manages the relay’s Service and other resources. It could also maintain the pool’s exports, like creating relay + FE exports and handling them + their cleanup. Extending this controller would avoid a lot of the extra plumbing here
…roller
Move the pool's ServiceExports from the DGD controller into the
DynamoPoolRelay controller, which already watches the Relay's DGD and
publishes the Relay's Service. The exports now follow that decision:
- The Relay controls each export it creates, so garbage collection
deletes the exports with the Relay, and every reason the controller
withdraws the Relay's Service, such as a missing or terminating DGD,
unsupported discovery, no workers or an ownership conflict, withdraws
the exports too.
- The DGD controller no longer touches exports, and the DGD has no
GlobalRouterPoolExported condition. The problems that only the operator
can see are Warning events on the Relay: InvalidServiceName,
ServiceNameTooLong, NoFrontend, ClusterIDMismatch and ExportFailed. The
MCS implementation reports on each export in the export's own status.
- A terminal error from the DGD's workloads no longer stops the exports
from being retried: the Relay controller retries a failed export write
with backoff, whatever the DGD's workloads report.
- An export that the Relay controls is repaired with a server-side apply
of only the fields that the controller writes. The apply carries the
UID and resourceVersion of the export whose controller was checked, so
it never writes to an export that changed hands in between.
- An export is deleted with UID and resourceVersion preconditions, for
the same reason.
- The controller watches the About API's ClusterProperty that holds the
cluster's ID in its ClusterSet, so a change of that ID is reported at
once. Namespace-restricted installs read it through a cluster-wide
reader role.
The docs describe the exports on the PoolRelay page, and the DGD
reference drops its pool export section.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Signed-off-by: Anna Tchernych <atchernych@nvidia.com>
…rt guard
An adversarial review of the pool's exports found that their events
merged. client-go's events API counts an event as a repeat of an earlier
one when both have the same object, reason, action and related object,
whatever their notes. So the second export that a reconcile created
became a repeat of the first, and ClusterIDMismatch kept the old cluster
ID after the property changed. Each event now names a related object:
the export that it created, repaired or deleted, or the DGD or
ClusterProperty that its problem is about, at the version read.
multicluster.ReadClusterID becomes ReadClusterIDProperty, which returns
the property.
The review also corrected the PoolRelay page:
- With Karmada, clusterId must be the cluster's member cluster name, by
which the Global Discovery Service matches the pool to its imports.
- InvalidServiceName comes from a frontend Service name over 63
characters. A DGD name with a dot withdraws the Relay before anything
is exported, so it was the wrong example.
- An export whose controller reference someone removed or replaced is
no longer the Relay's: it is neither repaired nor withdrawn, nor
deleted with the Relay.
Breaking any guard of the exports on purpose now makes a test fail,
except the delete's UID precondition, which its resourceVersion
precondition already implies. New tests cover:
- the watches that the controller adds at startup: the ClusterProperty
watch only with standard MCS and the About API, the ServiceExport
watch at the resolved version, and ClusterProperty events reaching a
namespace-restricted operator;
- Reconcile returning a failed export write, with no requeue result;
- the gate's resolution in features.New;
- exports being deleted or already gone, names that became
unexportable, same-named exports in another namespace, exports that
another kind controls, and a cluster ID property without a value.
The retry test now refuses creates only once the Relay is Ready, when
only the retries of the failed reconciles can requeue it.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Signed-off-by: Anna Tchernych <atchernych@nvidia.com>
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Summary
The operator step of the pool discovery DEP (#17600): the operator creates the
ServiceExports that announce a Global Router pool to other clusters, for the Global Discovery Service's MCS backend (#17331, #17332).Since the first review
DynamoPoolRelaycontroller (feat(operator): deploy active-active PoolRelay for one DGD #17347) maintains the exports, in place of a reconciler in the DGD controller. The DGD controller is unchanged, and the DGD gets no condition: the operator reports problems as Warning events on theDynamoPoolRelay.DynamoPoolRelaycontroller, which returns no terminal errors, retries a failed export write with backoff.ClusterPropertythrough the cache, instead of reading it from the API server at most once a minute. A namespace-restricted install now reads it through a separateClusterRole, so it gets the check too.What it does
multiCluster.mcsImplementation(Helm:dynamo-operator.dynamo.multiCluster.mcsImplementation) tomcsorkarmada. Then, for eachDynamoPoolRelaythat it publishes, theDynamoPoolRelaycontroller exports the pool, the DGD with the relay's name. It creates aServiceExportfor:<DGD name>-pool-relay, the PoolRelay Service that theDynamoPoolRelaycreates;<DGD name>-<component name>, lowercased, with dots replaced by dashes. The Global Discovery Service finds frontends by a Service name suffix,-frontendby default, which matches a component namedFrontend.Readycondition gives the reason. A DGD created again under the relay's name is exported again, and renaming or removing a frontend component withdraws that component's export.ExportFailedWarning event. The DGD controller does not touch exports, so the DGD's workload errors, terminal or not, do not hold them back.ServiceExportthat the relay does not control, such as one a user created, is neither adopted, repaired nor deleted. Once it is deleted, the relay creates its own. An export that is being deleted is left alone until it is gone, and then created again.multiClusterExport, resolves at startup and returns the version at which the cluster servesServiceExports,v1alpha1; every list, create, apply, delete and watch of an export uses it. As with other integrations that are enabled explicitly, setting an implementation in a cluster without themulticluster.x-k8s.io/v1alpha1ServiceExportAPI fails startup.ServiceExports are read through the manager's cache, which the controller's watch fills; the manager's client would read these unstructured objects from the API server. An export's creation or deletion, or an update while it has a controller, requeues the relay that controls it and each relay whose DGD exports a Service of its name.Warning events instead of a condition
DynamoPoolRelay:InvalidServiceName,ServiceNameTooLong,NoFrontend,ClusterIDMismatchandExportFailed. Normal events record each export that it creates, repairs or deletes. Each event names a related object: the export, or the DGD or ClusterProperty that its problem is about, at the version read. The events API counts events with the same object, reason, action and related object as repeats, whatever their notes. The MCS implementation reports on each export in the export's own status, which the operator does not read.mcs, the controller compares theDynamoPoolRelay'sclusterIdwith the cluster's ID in its ClusterSet, which the About API'sClusterPropertycluster.clusterset.k8s.ioholds, and recordsClusterIDMismatchwhen they differ. The Global Discovery Service joins a pool's registration to its import only when they match. The controller watches the property, so creating, changing or deleting it requeues every relay. Without the property the check is skipped; a failed read, such as a Forbidden one, is anExportFailederror that is retried. As for DeviceClasses and Queues, a separateClusterRolegrants the read in every install, because a namespace-restricted install's Role cannot grant a cluster-scoped kind.Karmada and standard MCS
clusterId. The Global Discovery Service matches a pool's registration to its imports by the name that the implementation gives the cluster (feat(global-router): read pool models from registrations, not a file #17332). So set theDynamoPoolRelay'sclusterIdto that name: the About API cluster ID with standard MCS, or the member cluster name with Karmada.ServiceExport. Karmada'sServiceExportcontroller (v1.19.0,pkg/controllers/mcs/service_export_controller.go) watches the SIG MulticlusterServiceExportin member clusters. So for both, the export sits next to its Service in the workload cluster, and the operator needs no access to the Karmada control plane. Karmada's ownMultiClusterService(networking.karmada.io) lives on the control plane, which the operator cannot reach.kubernetes.io/service-name: derived-<service>, and a label value has at most 63 characters. Withkarmada, the operator skips a longer Service name and recordsServiceNameTooLong; for-pool-relaythat means a DGD name of at most 44 characters. Standard MCS has no such limit. The Global Discovery Service in feat(global-router): add the Global Discovery Service library (contract and backends) #17331 uses the same limit.ServiceExports only while its control plane has propagated at least oneServiceExportthere, including after Karmada restarts. Keep one in place in each member; that setup is outside the operator.--pool-discovery karmada|mcs(feat(global-router): add the Global Discovery HTTP service #17371).API and conversion
DynamoPoolRelaymarks the pool, so the DGD needs neither an annotation nor a field, and its status is unchanged.OperatorConfigurationgainsmultiCluster.mcsImplementation. That type has one version and no conversion, so conversion is not affected.Open points
mcsImplementationleaves existing exports in place until theirDynamoPoolRelays are deleted. Cleaning them up would need an API read on every reconcile, or the export watch with the feature off.ClusterPropertyatabout.k8s.io/v1alpha1. The About API's current CRD (kubernetes-sigs/about-api) storesv1beta1and still servesv1alpha1; once a release stops servingv1alpha1, the cluster ID check turns off without a warning. Whether the check runs is also decided when the operator starts, so installing the About API later needs a restart. Resolving the served version at startup, as the gate does forServiceExport, would fix the first, and a log line when the check is off would show both.DynamoPoolRelay'sclusterIdfrom the About API instead of only checking it.multicluster.x-k8s.io/v1beta1export. This PR passes the resolved version through in fix(operator): accept any served ServiceExport version for multi-cluster export #17606's shape, so fix(operator): accept any served ServiceExport version for multi-cluster export #17606 only needs itsv1beta1probe, tests and docs. Its rebase onto this PR, on branchatchernych/operator-mcs-gate-any-version-rebased, predates this revision and needs one more. The code merges cleanly; the conflicts are all in documentation: themcsImplementationdescription, which this revision also edited, its generated copies, and the DGD page section that this revision removed.Validation
On e69099a:
Operator tests, as
make testruns them (unit and envtest): all 50 packages pass. The export tests:NoFrontend;DynamoPoolRelaycontroller:Reconcilereturns a failed export write, with no requeue result.AlreadyExists) is no error;ExportFailed, and converges on the retry.features.Newturns the gate on for a configured implementation.ClusterProperty.v1beta1, with the gate resolved to it.Guard-breaking pass: it broke 100 guards in the export code one at a time, and ran the tests on each.
Reconcilereturns;Adversarial review against the Global Router coding standards, run on b150cae. Its verified findings are fixed:
ClusterIDMismatchkept stale IDs;clusterIdmust be with Karmada, gave anInvalidServiceNameexample that cannot happen, and overstated what a repair restores;Left as they are:
internal/multicluster, and the pool's Service naming intopoolrelay;Gates.ServiceExportVersion, whose shape fix(operator): accept any served ServiceExport version for multi-cluster export #17606 builds on;make manifestsaddsmulticluster.x-k8s.ioserviceexports(create, delete, get, list, patch, watch) andabout.k8s.ioclusterproperties(get, list, watch) torole.yaml.gen_kubernetes_api.py --checkandmake generate-helm-docsshow no drift. The PoolRelay page documents the exports and their events, and the curated DGD page no longer covers them.The platform chart's
make test: 18 suites and 83 tests pass, and 8 Python tests.golangci-lintv2.15.0: 0 issues. The docs lint: 0 errors. pre-commit passes on the changed files.Not run on a cluster.
🤖 Generated with Claude Code
Summary by CodeRabbit