feat: bind content to the PVC store by oleg-kushniriov · Pull Request #492 · ai-dynamo/snapshot

oleg-kushniriov · 2026-10-07T10:39:48Z

What this PR does / why we need it

Makes the artifact-addressed path from #475 reachable at runtime.

Content binding. The operator sets spec.storage.storeID on every new PodSnapshotContent, using the store identity it already reads out of storage.yaml. The chart starts the PageBroker sidecar with the same storage.yaml (--storage-config) so the broker can refuse targets and descriptors from another store.

Rollout switches, temporary. Two Helm values, pageBroker.artifactAddressing and operator.bindNewContents, gate the two halves so this PR can merge ahead of the PageBroker backend without breaking main. They are removed again by the lifecycle PR at the top of this stack, once the backend is below it; the end state has no switches, PageBroker always receives the store configuration and the operator always binds.

Shared identity vectors. The C++ copy of the store-ID test vectors is synced with the api/storage source.

Restore cleanup on a failed staging unmount. If unmounting PageBroker's restore staging fails, Restore no longer commits (or aborts) the transaction — it leaves it for PageBroker's own expiry to reclaim, since the staging may still be in use.

Which issue(s) this PR addresses

Part of #237.

How was this tested?

api: go test ./...
operator: go vet, go test for cmd, controller, maintenance
agent: GOOS=linux go vet, make linux-test (full suite in the golang container)
chart: helm unittest (62 cases), helm lint
golangci-lint v2.13.2 (pinned version, run from its container): 0 issues in all three modules
Not run: GPU e2e. It needs images from a push-artifacts.yaml dispatch and a PageBroker build that implements the PVC artifact backend.

Special notes for your reviewer

Base is #475.

The PageBroker C++ that serves these requests is the next PR in this stack. Until it lands, a bound request fails in the broker with INVALID_REQUEST and nothing is published, so merging this ahead of the broker is safe but inert.

The agent's checkpoint PVC mount is kept. Removing it breaks pageBroker.restoreMode: direct, which bind-mounts the PVC path from the agent for legacy content. Bound content never reads the PVC from the agent.

While the switches exist the rollout is two steps: deploy pageBroker.artifactAddressing first, confirm the broker build is compatible, then enable operator.bindNewContents. The lifecycle PR removes both and documents the one remaining caveat instead: finish the agent DaemonSet rollout before starting captures on an upgraded installation.

The companion e2e PR, which requires the store-bound publication on every capture, is kept separate so it can wait for the broker build.

Does this PR introduce an API change?

New PodSnapshotContent objects are bound to the configured PVC store (spec.storage.storeID). The PageBroker sidecar receives --storage-config. No workload-facing API change.

Summary by CodeRabbit

New Features
- Optionally bind newly captured snapshot content to its configured storage, with both rollout settings disabled by default.
- Chart configuration prevents enabling content binding before artifact addressing is enabled.
- Existing content without a storage binding continues to use the legacy path.
Bug Fixes
- Restore cleanup now handles staging unmount failures without proceeding to commit, and reports cleanup failures.
Documentation
- Added guidance for staged rollout, compatibility requirements, and storage-related restore errors.

coderabbitai · 2026-10-07T10:39:57Z

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agent/internal/executor/restore.go
agent/internal/executor/restore_test.go

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Walkthrough

The pull request adds staged artifact-addressing rollout controls and optional storage binding for new content. It also changes restore cleanup ordering for staging unmount failures and adds coverage for both cleanup paths.

Changes

Artifact addressing

Layer / File(s)	Summary
Storage identity and vectors `agent/pagebroker/testdata/storage-contract/identity.json`, `agent/pagebroker/testdata/storage-contract/identity.json.license`, `api/storage/identity_test.go`	Adds eight PageBroker storage identity vectors, license metadata, and a test that keeps the PageBroker and API vector files identical.
Rollout controls and content binding `charts/snapshot/values.yaml`, `charts/snapshot/templates/configmap.yaml`, `charts/snapshot/templates/daemonset.yaml`, `charts/snapshot/templates/operator-deployment.yaml`, `charts/snapshot/tests/*.yaml`, `operator/cmd/manager/main.go`, `operator/cmd/manager/storage_config.go`, `operator/cmd/manager/storage_config_test.go`, `operator/internal/controller/podsnapshot_reconciler.go`, `operator/internal/controller/podsnapshot_reconciler_test.go`, `charts/snapshot/README.md`, `docs/operations/storage.md`	Adds disabled-by-default artifact-addressing and new-content binding settings. Helm rejects binding without artifact addressing. The manager validates the store configuration, and the reconciler assigns `Spec.Storage` only when binding is enabled. Documentation describes staged activation and publication descriptors.

Restore transaction cleanup

Layer / File(s)	Summary
Restore transaction cleanup `agent/internal/executor/restore.go`, `agent/internal/executor/restore_test.go`	Keeps failed staging unmounts tracked for deferred retry and skips Commit and Abort. After a successful unmount, Commit proceeds; a Commit failure triggers Abort and remains a cleanup error. Tests cover both paths and verify operation ordering.

Priority: Normal

Estimated code review effort: 3 (Moderate) | ~30 minutes

Sequence Diagram(s)

sequenceDiagram
  participant Helm
  participant ManagerMain
  participant PodSnapshotReconciler
  participant PodSnapshotContent
  Helm->>ManagerMain: pass binding configuration
  ManagerMain->>PodSnapshotReconciler: provide capture StoreID
  PodSnapshotReconciler->>PodSnapshotContent: set storage binding

Merge Risk: Moderate · up to 0adee

On an existing installation, enabling both switches in one upgrade can create bound content before older agents are replaced. Use the documented staged rollout or enforce the dependency before merging. The values-table and bucket-validation concerns also remain open.

Pre-merge checks: 6 · 1

Failed checks: 1 warning

Check name	Status	Explanation	Resolution
Docstring Coverage		Docstring coverage is 28.00% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 25 functions across 11 files.	Write docstrings for the functions missing them to satisfy the coverage threshold.

Passed checks: 6 passed

Check name	Status	Explanation
Description Check		Check skipped - CodeRabbit’s high-level summary is enabled.
Title check		The title uses the required `feat:` Conventional Commits prefix, is 35 characters long, and accurately describes binding content to the PVC store.
Linked Issues check		Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check		Check skipped because no linked issues were found for this pull request.
Breaking Api Changes		No breaking API change is introduced. The authoritative PR diff changes only `api/storage/identity_test.go` under `api/**`; it does not add, remove, rename, or retag exported fields. The `PodSnapshotS…
Rbac Least Privilege		No wildcard RBAC grant was introduced. The changed reconciler retains explicit kubebuilder verbs and resources, and the PR changes no RBAC manifest. Repository Helm RBAC rules also use explicit verbs …

Full details: Breaking Api Changes

Explanation

No breaking API change is introduced. The authoritative PR diff changes only api/storage/identity_test.go under api/**; it does not add, remove, rename, or retag exported fields. The PodSnapshotSpec and PodSnapshotContentSpec immutability markers are unchanged. The previously reported Config.S3 and S3 fields are absent from both the PR base and head, so that prior failure does not apply. Prior failure refuted: The base and head both define only Config.PVC in api/storage/config.go; no s3.go exists. The PR's only api/** change is a test, and no API field or immutability marker changes.

Full details: Rbac Least Privilege

Explanation

No wildcard RBAC grant was introduced. The changed reconciler retains explicit kubebuilder verbs and resources, and the PR changes no RBAC manifest. Repository Helm RBAC rules also use explicit verbs and resources; no wildcard pattern exists.

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Implements artifact-addressed checkpoint, restore and metadata retrieval in broker.cpp, replacing the INVALID_REQUEST throws with real dispatch over the existing artifacts/<contentUID>/containers/<name>/ layout — not a new on-disk scheme, so #474's maintenance and legacy restore are unchanged. PVCArtifactStore publishes a checkpoint atomically (copy into a partial path, then the same partial/previous/published rename dance the legacy PosixCopyEngine already uses, since staging on tmpfs and the PVC are different filesystems and cannot be renamed across) and writes a publication.json evidence sidecar recording the store ID, artifact handle and deterministic commitID next to manifest.yaml. Restore and GetArtifactMetadata resolve and verify that evidence, mapping failures to STORE_MISMATCH, ARTIFACT_NOT_FOUND, ARTIFACT_CORRUPT and UNSUPPORTED_ARTIFACT rather than collapsing them into STORAGE_ERROR. identity.cpp computes StoreID/CommitID with a self-contained SHA-256, matching api/storage/identity.go's length-prefixed preimage encoding field for field; identity_test.cpp checks it against the same vectors the Go side uses (api/storage/testdata/identity.json). main.cpp parses the sidecar's existing --storage-config argument (added by #492) and resolves the configured store at startup; storage_config.cpp is a parser for exactly that fixed YAML shape, not a general YAML dependency added for four string fields. Signed-off-by: Oleg Kushniriov <okushniriov@nvidia.com>

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Inline comments:
Review comments at @agent/internal/executor/restore.go:
- Around line 370-374: Add tests for the post-`execNSRestore` cleanup branches
using a success-path fixture with controllable unmount and broker responses.
Verify that a failed source unmount invokes neither PageBroker Commit nor Abort,
and that a Commit failure after a successful unmount returns a
*RestoreCleanupError.

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📒 Files selected for processing (17)

agent/internal/executor/restore.go
agent/pagebroker/testdata/storage-contract/identity.json
agent/pagebroker/testdata/storage-contract/identity.json.license
api/storage/identity_test.go
charts/snapshot/README.md
charts/snapshot/templates/configmap.yaml
charts/snapshot/templates/daemonset.yaml
charts/snapshot/templates/operator-deployment.yaml
charts/snapshot/tests/pagebroker_test.yaml
charts/snapshot/tests/storage_test.yaml
charts/snapshot/values.yaml
docs/operations/storage.md
operator/cmd/manager/main.go
operator/cmd/manager/storage_config.go
operator/cmd/manager/storage_config_test.go
operator/internal/controller/podsnapshot_reconciler.go
operator/internal/controller/podsnapshot_reconciler_test.go

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Implements artifact-addressed checkpoint, restore and metadata retrieval in broker.cpp, replacing the INVALID_REQUEST throws with real dispatch over the existing artifacts/<contentUID>/containers/<name>/ layout — not a new on-disk scheme, so #474's maintenance and legacy restore are unchanged. PVCArtifactStore publishes a checkpoint atomically (copy into a partial path, then the same partial/previous/published rename dance the legacy PosixCopyEngine already uses, since staging on tmpfs and the PVC are different filesystems and cannot be renamed across) and writes a publication.json evidence sidecar recording the store ID, artifact handle and deterministic commitID next to manifest.yaml. Restore and GetArtifactMetadata resolve and verify that evidence, mapping failures to STORE_MISMATCH, ARTIFACT_NOT_FOUND, ARTIFACT_CORRUPT and UNSUPPORTED_ARTIFACT rather than collapsing them into STORAGE_ERROR. identity.cpp computes StoreID/CommitID with a self-contained SHA-256, matching api/storage/identity.go's length-prefixed preimage encoding field for field; identity_test.cpp checks it against the same vectors the Go side uses (api/storage/testdata/identity.json). main.cpp parses the sidecar's existing --storage-config argument (added by #492) and resolves the configured store at startup; storage_config.cpp is a parser for exactly that fixed YAML shape, not a general YAML dependency added for four string fields. Signed-off-by: Oleg Kushniriov <okushniriov@nvidia.com>

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Review comments at @charts/snapshot/tests/pagebroker_test.yaml:
- Around line 79-90: Update the test identified by “passes store identity when
the artifact backend is explicitly enabled” to assert that --storage-config and
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agent/internal/executor/restore.go
agent/pagebroker/testdata/storage-contract/identity.json
api/storage/identity_test.go
charts/snapshot/README.md
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docs/operations/storage.md

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Inline comments:
Review comments at @docs/operations/storage.md:
- Around line 52-78: Enforce the two-step rollout at runtime: gate
operator.bindNewContents so new content cannot be bound until every serving
agent reports support for artifact addressing. Keep
pageBroker.artifactAddressing independent, and retain the existing rollout
guidance while ensuring an incompatible agent cannot mark bound content Ready
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api/storage/identity_test.go
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- Line 190: Update the descriptions for operator.bindNewContents and the other
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🟠 Major · Gate bindNewContents on a capable PageBroker image. · configmap.yaml:12-13

charts/snapshot/templates/configmap.yaml:12-13
🩺 Stability & Availability | 🟠 Major | ⚡ Quick win

Gate bindNewContents on a capable PageBroker image.

The current guard treats pageBroker.artifactAddressing=true as proof of backend support. It is not. With both flags enabled, the operator binds new contents, but the bundled PageBroker rejects PrepareArtifactCheckpoint with INVALID_REQUEST. Every new bound capture can therefore fail during preparation.

Keep binding disabled until the chart can enforce selection of a PageBroker image that implements the PVC artifact backend.
Suggested fix
-{{- if and .Values.operator.bindNewContents (not .Values.pageBroker.artifactAddressing) }}
-{{- fail "operator.bindNewContents requires pageBroker.artifactAddressing and a completed compatible agent rollout" }}
+{{- if .Values.operator.bindNewContents }}
+{{- fail "operator.bindNewContents requires a PageBroker image implementing the PVC artifact backend" }}
 {{- end }}
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Review comment at @charts/snapshot/templates/configmap.yaml around lines 12 -
13:
Update the guard in the ConfigMap template so `operator.bindNewContents` always
fails until the chart can enforce selection of a PageBroker image that
implements the PVC artifact backend. Do not treat
`pageBroker.artifactAddressing` as proof of backend support.

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Inline comments:
Review comments at @agent/internal/executor/restore.go:
- Line 370: Update the cleanup tracking around lastMount.point.Unmount(ctx) so
the source mount remains in activeMounts when unmounting fails and is removed
only after a successful unmount. Preserve the existing rule that an attached
staging source is neither committed nor aborted.

Review comments at @docs/operations/storage.md:
- Around line 142-143: Update the PageBroker expiry description to say that a
transaction exceeding the fixed 2h5m lifetime fails Commit with
TRANSACTION_EXPIRED and that cleanup begins but removal may be deferred while
GPU work is active or if filesystem cleanup fails. Keep the surrounding
description of legacy path-addressed requests unchanged.

---

Outside diff comments:
Review comments at @charts/snapshot/templates/configmap.yaml:
- Around line 12-13: Update the guard in the ConfigMap template so
`operator.bindNewContents` always fails until the chart can enforce selection of
a PageBroker image that implements the PVC artifact backend. Do not treat
`pageBroker.artifactAddressing` as proof of backend support.

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agent/internal/executor/restore.go
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Inline comments:
Review comments at @agent/internal/executor/restore_test.go:
- Around line 1229-1236: Update the failed-unmount restore test around Restore
and waitPageBrokerTest to verify that no Commit or Abort PageBroker request
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Inline comments:
Review comments at @api/storage/s3.go:
- Around line 103-110: Update validateBucket to reject bucket names containing
adjacent periods, while preserving its existing character and boundary checks.
Add an invalid-identity test covering a name such as foo..bar so StoreID rejects
this unusable bucket configuration.

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The operator now sets spec.storage.storeID on every PodSnapshotContent it creates, from the store identity it already reads out of storage.yaml, so the artifact-addressed path added in the previous PR is reached at runtime. The chart starts the PageBroker sidecar with the same storage.yaml so the broker can refuse targets and descriptors from another store. A bound capture whose Commit reply or Ready write was lost is recovered by asking PageBroker for the deterministic publication (artifacts/<contentUID>/containers/<name>) through GetArtifactMetadata, never by reading the PVC from the agent; the capture source recorded on Ready comes from that manifest. Legacy content keeps the filesystem check. The agent's checkpoint PVC mount is kept: pageBroker.restoreMode=direct bind-mounts the PVC path from the agent for legacy content. The PageBroker C++ that serves these requests ships separately on the transfer-engine chain; until it lands, bound requests fail in the broker with INVALID_REQUEST and nothing is published. Signed-off-by: Oleg Kushniriov <okushniriov@nvidia.com>

A failed unmount can mean staging is still in use by something else, so forcing a Commit or an Abort right after is unsafe. Per SNEP-237, skip both and leave the transaction for PageBroker to reclaim on expiry instead. Signed-off-by: Oleg Kushniriov <okushniriov@nvidia.com>

Signed-off-by: Oleg Kushniriov <okushniriov@nvidia.com>

…age source feat/pvc-checkpoint's identity.go no longer derives a commit ID or commit vectors (SNEP-237: the publication has one fixed path per content and container, so a retried Commit needs no derived identity to replay against). That change updated api/storage/testdata/identity.json but never reached this copy, which the C++ PageBroker build reads separately since its build context is agent/pagebroker alone. No C++ source reads commitID or canonicalHex; only this file carried them. Copy api/storage/testdata/identity.json over this file so TestPageBrokerVectorCopyMatches holds again. Signed-off-by: Oleg Kushniriov <okushniriov@nvidia.com>

A bound checkpoint whose Commit fails is CheckpointFailed, the same as a legacy one. The agent no longer records a pending outcome or probes the store for a publication, so the operations guide must not describe it. Signed-off-by: Oleg Kushniriov <okushniriov@nvidia.com>

restore() popped the source mount from activeMounts whether or not its Unmount succeeded, so a failed unmount was never retried by the deferred cleanup and the bind mount leaked in the restored container until it exited on its own. Only drop the entry once it actually unmounts. Add tests for both branches CodeRabbit flagged: a failed unmount skips Commit/Abort and is retried by cleanup, and a Commit failure after a successful unmount still returns a *RestoreCleanupError. Also assert the full PageBroker daemon args list instead of two independent contains checks for --storage-config and its path, and correct the expiry-cleanup doc to say removal can be deferred rather than unconditional. Signed-off-by: Oleg Kushniriov <okushniriov@nvidia.com>

Signed-off-by: Oleg Kushniriov <okushniriov@nvidia.com>

oleg-kushniriov added this pull request to stack #473 October 7, 2026 10:40

oleg-kushniriov force-pushed the feat/pvc-restore branch from 2dadda4 to 2b27010 Compare October 7, 2026 11:54

oleg-kushniriov force-pushed the feat/pvc-restore branch from 2b27010 to 387044a Compare October 7, 2026 12:08

oleg-kushniriov force-pushed the feat/pvc-restore branch from 387044a to 051d235 Compare October 7, 2026 13:12

oleg-kushniriov force-pushed the feat/pvc-restore branch from 572dafd to 22fb43a Compare October 7, 2026 14:35

oleg-kushniriov force-pushed the feat/pvc-restore branch from 22fb43a to aa31c17 Compare October 8, 2026 09:15

oleg-kushniriov force-pushed the feat/pvc-restore branch from aa31c17 to cf68475 Compare October 8, 2026 09:44

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oleg-kushniriov removed this pull request from stack #473 October 8, 2026 11:05

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feat(pagebroker): implement the PVC artifact-storage backend #508

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oleg-kushniriov added this pull request to stack #509 October 8, 2026 11:05

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feat(pagebroker): implement the PVC artifact-storage backend #496

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oleg-kushniriov marked this pull request as ready for review October 8, 2026 12:27

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Comment thread agent/internal/executor/restore.go

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Comment thread charts/snapshot/tests/pagebroker_test.yaml

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feat(api): add the S3 storage identity type #662

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feat(operator,chart): resolve S3 store identity and configure PageBroker's S3 backend #663

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feat(pagebroker): configure Model Streamer runtime tuning #469

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feat(pagebroker): publish and restore S3 checkpoint artifacts #416

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oleg-kushniriov added 7 commits October 25, 2026 16:45

fix(storage): separate backend rollout from bound capture activation

78de7df

Signed-off-by: Oleg Kushniriov <okushniriov@nvidia.com>

fix(agent): update commit-failure test for failStep's error wording

0adee5d

Signed-off-by: Oleg Kushniriov <okushniriov@nvidia.com>

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feat: bind content to the PVC store - #492

feat: bind content to the PVC store#492
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