🐛 Return 503 instead of 404 for unavailable catalog content - #2879
🐛 Return 503 instead of 404 for unavailable catalog content#2879redhat-chai-bot wants to merge 1 commit into
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Included review availability: Your plan provides up to 2 included reviews per hour; 1 remains after this review. 📝 WalkthroughWalkthroughMissing catalog content returns HTTP 404 for leaders and HTTP 503 with ChangesCatalog availability response
Estimated code review effort: 3 (Moderate) | ~25 minutes Merge Risk: ⚪ Minimal · up to The PR changes unavailable catalog responses from 404 to retryable 503 with a Retry-After header; no actionable merge-blocking risk remains beyond normal checks and review. Sequence Diagram(s)sequenceDiagram
participant Client
participant CatalogHandlers
participant LocalDirV1
Client->>CatalogHandlers: Request catalog content
CatalogHandlers->>LocalDirV1: Retrieve catalog content
LocalDirV1-->>CatalogHandlers: Content or missing-content error
CatalogHandlers-->>Client: 404 if leader, or 503 with Retry-After if non-leader
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Actionable comments posted: 1
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Inline comments:
In `@internal/catalogd/server/handlers_test.go`:
- Around line 216-217: Extend the unavailable-catalog assertions in
internal/catalogd/server/handlers_test.go at lines 216-217 to verify Retry-After
is 1 and the body contains “catalog content not yet available”; also update
internal/catalogd/storage/localdir_test.go at lines 309-311 to verify
Retry-After is 1, alongside the existing 503 checks.
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internal/catalogd/server/handlers.gointernal/catalogd/server/handlers_test.gointernal/catalogd/serverutil/serverutil.gointernal/catalogd/storage/localdir_test.go
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Actionable comments posted: 2
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Inline comments:
In `@cmd/catalogd/main.go`:
- Around line 393-400: Declare localStorage as *storage.LocalDirV1 before
assigning its IsLeader function, while preserving its existing use as a
storage.Instance argument in subsequent calls.
In `@internal/catalogd/server/http_preconditions_check.go`:
- Around line 65-67: Update the invalid If-Modified-Since handling in
checkPreconditions to return an error result that signals the caller to stop
processing after http.Error writes the 500 response, preventing handleV1Metas
from appending catalog JSONL. Add a test covering an invalid If-Modified-Since
value with existing catalog content and verify the response remains only the
error response.
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cmd/catalogd/main.gointernal/catalogd/server/handlers.gointernal/catalogd/server/handlers_test.gointernal/catalogd/server/http_preconditions_check.gointernal/catalogd/storage/localdir.gointernal/catalogd/storage/localdir_test.go
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This seems reasonable to me given the current HA setup and service label selector, though I still think it is problematic that our service routes to non-leader pods. I'd like to solve the architecture problem (which could be done in a follow-up), perhaps by:
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Actionable comments posted: 1
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Inline comments:
In `@cmd/catalogd/main.go`:
- Around line 389-401: The localStorage.IsLeader initialization around
mgr.Elected must account for disabled leader election: assign the callback only
when cfg.enableLeaderElection is true, and leave it nil otherwise so standalone
startup preserves 404 behavior. Add a startup test covering the
disabled-election case and confirming IsLeader remains unset.
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cmd/catalogd/main.gointernal/catalogd/server/handlers_test.gointernal/catalogd/server/http_preconditions_check.go
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When a catalog's content is not found (fs.ErrNotExist), the HTTP response now depends on whether the current pod is the leader: - Leader: returns 404 Not Found, because the leader has reconciled all catalogs and the content genuinely does not exist. - Non-leader: returns 503 Service Unavailable with Retry-After: 1, because the content may exist on the leader but has not been synced to this replica yet. Previously, all pods unconditionally returned 503 for missing content, which told clients to retry forever even when the leader knew the catalog did not exist. The leadership status is derived from the controller-runtime manager's Elected() channel, which closes when the pod wins the leader lease (or immediately when leader election is disabled). Co-Authored-By: Claude Opus 4.6 <[email protected]>
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Summary
When catalogd runs with 2 replicas and leader election enabled, only the leader pod downloads and stores catalog content locally. Non-leader pods serve the catalog HTTP endpoint but have an empty local cache, so requests that hit the non-leader currently return 404 Not Found.
This is semantically incorrect — the catalog does exist, it is just not available on this particular pod. This change returns 503 Service Unavailable with a
Retry-After: 1header instead, which:Changes
internal/catalogd/server/handlers.go: ChangedhttpError'sfs.ErrNotExistmapping fromhttp.StatusNotFound(404) tohttp.StatusServiceUnavailable(503), addedRetry-After: 1header, updated message to"catalog content not yet available"internal/catalogd/serverutil/serverutil.go: Updated code comments referencing "return 404" to reflect the new 503 behaviorinternal/catalogd/server/handlers_test.go: Updated test assertion for catalog-not-found error to expect 503internal/catalogd/storage/localdir_test.go: Updated integration test for non-existent catalog query to expect 503 and the new messageContext
The existing code comments in
serverutil.godocument this as intentional behavior:The design is correct — callers should retry. But 404 is the wrong HTTP status for this. Per RFC 9110, 404 indicates the resource does not exist, while 503 indicates a temporary unavailability. The
Retry-Afterheader provides an explicit hint for when to retry.No architectural changes — the leader election, readiness probes, and reconciler logic are all unchanged.
AI-generated. Review for accuracy.
@grokspawn requested in Slack thread
Summary by CodeRabbit
Retry-After: 1header and clearer availability message.If-Modified-Sincevalues now return an explicit 500 Internal Server Error.