fix(packageserver): bound and stagger catalog refresh work by stevekuznetsov · Pull Request #3920 · operator-framework/operator-lifecycle-manager

stevekuznetsov · 2026-09-16T13:33:06Z

Unbounded package refresh fan-out can overwhelm resource-constrained catalogs. Share a configurable worker limit across refreshes and jitter queued catalog notifications to reduce synchronized request bursts.

Preserve cached packages on interrupted streams, honor cancellation, and report refresh completion. Add concurrency, scheduling, and flag validation tests and document the defaults and unchanged RPC timeout.

Summary by CodeRabbit

New Features
- Added configurable package refresh concurrency with --package-refresh-workers (default: 4; range: 1–128).
- Added configurable catalog refresh jitter with --catalog-refresh-jitter (default: 0.2; range: 0–1) to spread periodic and follow-up refreshes over time.
- Package refreshes now run concurrently within the configured limit and respond to cancellation.
- Invalid refresh settings are rejected before the package server starts.
Documentation
- Documented refresh settings, timing behavior, defaults, and command-line options in the README.

openshift-ci · 2026-09-16T13:33:14Z

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openshift-ci · 2026-09-16T13:33:19Z

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coderabbitai · 2026-09-16T13:33:30Z

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Reviewing files that changed from the base of the PR and between 41a790f and 9c5fd26.

📒 Files selected for processing: 3

pkg/package-server/provider/registry.go
pkg/package-server/provider/registry_concurrency_test.go
pkg/package-server/provider/registry_test.go

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📝 Walkthrough

The package server adds configurable package refresh concurrency and catalog refresh jitter. It validates CLI values, schedules refreshes through a queue, limits package fetch concurrency, propagates refresh errors, and documents the settings.

Changes: Package refresh control

Layer / File(s)	Summary
Refresh configuration and wiring `pkg/package-server/provider/registry.go`, `pkg/package-server/server/server.go`, `pkg/package-server/server/server_test.go`, `pkg/package-server/provider/registry_test.go`	Adds worker and jitter settings, CLI flags, validation, provider wiring, and configuration tests.
Catalog refresh scheduling `pkg/package-server/provider/registry.go`, `pkg/package-server/provider/registry_schedule_test.go`, `README.md`	Queues CatalogSource refreshes with immediate or jittered delays. Tests cover scheduling, cancellation, shutdown, and capacity. The README documents settings and delay behavior.
Bounded cache refresh and error handling `pkg/package-server/provider/registry.go`, `pkg/package-server/provider/registry_concurrency_test.go`, `pkg/package-server/provider/registry_test.go`	Limits concurrent package refreshes, drains started workers, returns stream errors, and checks cancellation before garbage collection. Tests cover concurrency, cancellation, cache errors, and catalog refresh errors.

Priority: ➖ Normal

Estimated code review effort: 3 (Moderate) | ~25 minutes

Change: Bug fix

Sequence Diagram(s)

sequenceDiagram
  participant CatalogSourceInformer
  participant RegistryProvider
  participant RefreshQueue
  participant refreshCache
  CatalogSourceInformer->>RegistryProvider: catalog refresh event
  RegistryProvider->>RefreshQueue: enqueue immediate or delayed refresh
  RefreshQueue->>RegistryProvider: deliver refresh key
  RegistryProvider->>refreshCache: refresh catalog packages

Merge Risk: ⚪ Minimal · up to 9c5fd

Package refresh failures during stream setup now surface as errors and trigger the queue's rate-limited retries instead of being treated as successful. No outstanding merge-blocking concerns remain from this review.

Pre-merge checks: 4 · 1

Failed checks: 1 warning

Check name	Status	Explanation	Resolution
Docstring Coverage		Docstring coverage is 10.00% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 20 functions across 6 files.	Write docstrings for the functions missing them to satisfy the coverage threshold.

Passed checks: 4 passed

Check name	Status	Explanation
Title check		The title clearly summarizes the main changes: limiting catalog refresh concurrency and staggering refresh work with jitter.
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.
Description Check		Check skipped - CodeRabbit’s high-level summary is enabled.

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Inline comments:
In `@pkg/package-server/provider/registry.go`:
- Around line 365-366: Update refreshCache’s ListBundles and ListPackages
stream-setup error branches to return the original err instead of nil, while
retaining streamError for completion-log metadata. Leave per-package GetPackage,
conversion, and cache-add failure handling unchanged.

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README.md
pkg/package-server/provider/registry.go
pkg/package-server/provider/registry_concurrency_test.go
pkg/package-server/provider/registry_schedule_test.go
pkg/package-server/provider/registry_test.go
pkg/package-server/server/server.go
pkg/package-server/server/server_test.go

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Unbounded package refresh fan-out can overwhelm resource-constrained catalogs. Share a configurable worker limit across refreshes and jitter queued catalog notifications to reduce synchronized request bursts. Preserve cached packages on interrupted streams, honor cancellation, and report refresh completion. Add concurrency, scheduling, and flag validation tests and document the defaults and unchanged RPC timeout. Signed-off-by: Steve Kuznetsov <stekuznetsov@microsoft.com>

stevekuznetsov · 2026-09-16T14:53:36Z

E2E failure seems to be some catalog operator flake wrt the ConfigMap, not related to this change. I don't have permission to re-try the job.

perdasilva · 2026-09-17T14:16:46Z

 }

-func (p *RegistryProvider) refreshCache(ctx context.Context, client *registryClient) error {
+func (p *RegistryProvider) refreshCache(ctx context.Context, client *registryClient) (result error) {


could we avoid the named return parameter here?

perdasilva · 2026-09-18T11:50:46Z

 	return p, nil
 }

+func (p *RegistryProvider) enqueueRefresh(key registry.CatalogKey, resync bool) {


nit

Suggested change

func (p *RegistryProvider) enqueueRefresh(key registry.CatalogKey, resync bool) {

func (p *RegistryProvider) enqueueRefresh(key registry.CatalogKey, isResync bool) {

perdasilva · 2026-09-18T11:57:37Z

+			before, source := old.(*operatorsv1alpha1.CatalogSource), current.(*operatorsv1alpha1.CatalogSource)
+			p.enqueueRefresh(registry.CatalogKey{Namespace: source.Namespace, Name: source.Name}, before.ResourceVersion == source.ResourceVersion)
+		},
+		DeleteFunc: p.catalogSourceDeleted,


Does it matter that we're setting queueinformer.WithDeletionHandler(p.catalogSourceDeleted) on the queue informer (line 184)? From memory I think this is a no-op since we're no longer setting the informer. But from a maintenance perspective, I'm not sure if it could be a source of confusion or catalogSourceDeleted to be called twice if an informer ever gets set there again...thoughts?

perdasilva · 2026-09-18T11:58:48Z

should we add a return after the logging the error?

perdasilva · 2026-09-18T12:01:35Z

 	}

 	logger.Debug("caching new packages...")
 	wg.Wait()


the double wg.Wait could be a source of clarity issues. Would it make sense to wrap the for loop in its own function stanza an make the whole thing synchronous returning an error?

Signed-off-by: Steve Kuznetsov <stekuznetsov@microsoft.com>

stevekuznetsov · 2026-10-22T15:59:49Z

Addressed the five review comments in 9c5fd26:

Removed the named return from refreshCache; completion logging now uses the explicitly captured result after the refresh finishes.
Scoped package processing to a synchronous local function with one deferred wg.Wait(). Started workers drain on stream errors, and failed/canceled refreshes skip garbage collection.
Renamed resync to isResync.
Removed the inactive queue-informer deletion handler; the explicit informer DeleteFunc handles deletion.
Return an error immediately when the CatalogSource type assertion fails.

Added regression coverage for invalid sync input and a package-stream failure with an active worker, verifying worker draining, slot release, and cache preservation.

Validation passed:

go test -race ./pkg/package-server/provider
make lint GOLANGCI_LINT_ARGS=./pkg/package-server/provider/...
git diff --check

openshift-ci · 2026-10-24T11:12:54Z

PR needs rebase.

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openshift-ci Bot requested review from camilamacedo86 and oceanc80 September 16, 2026 13:33

openshift-ci Bot added the needs-ok-to-test Indicates a PR that requires an org member to verify it is safe to test. label Sep 16, 2026

coderabbitai Bot reviewed Sep 16, 2026

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Comment thread pkg/package-server/provider/registry.go Outdated

stevekuznetsov force-pushed the fix/package-server-refresh-concurrency-jitter branch from 161dad0 to 41a790f Compare September 16, 2026 14:05

perdasilva reviewed Sep 17, 2026

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perdasilva removed the needs-ok-to-test Indicates a PR that requires an org member to verify it is safe to test. label Sep 17, 2026

perdasilva reviewed Sep 18, 2026

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This was referenced Sep 23, 2026

OCPBUGS-78355: add cpu limits to catalogsource pods #3915

Merged

Revert "add cpu limits to catalogsource pods (#3915)" #3929

Merged

fix(packageserver): clarify refresh completion and event handling

9c5fd26

Signed-off-by: Steve Kuznetsov <stekuznetsov@microsoft.com>

openshift-ci Bot added the needs-rebase Indicates a PR cannot be merged because it has merge conflicts with HEAD. label Oct 24, 2026

	func (p *RegistryProvider) enqueueRefresh(key registry.CatalogKey, resync bool) {
	func (p *RegistryProvider) enqueueRefresh(key registry.CatalogKey, isResync bool) {

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