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fix(server/azure): exclude uninitialized replicas from readiness #488
Description
Summary
Azure readiness admits HTTP server processes before their lazy database initialization completes. A successful warm-up request does not establish readiness across replicas. This caused the main-branch deployment smoke test to fail after PR #472 merged at 4fe935e3dee6c0a7464cda279fbc308cbca728d5.
This is separate from #472's AWS recommendation completeness change. The startup, health, workflow, and Azure compute files traced here are unchanged between reviewed head ed80d762cd269b45482f57296306611d966beb8b and that merge.
Current behavior and evidence
Azure run 37243528487, Test Deployment records:
2026-10-04T23:29:33.116831115Z: the health gate returnshealthy, including auth, config, and migrations, after an API warm-up.2026-10-04T23:29:33.283074595Z: the first smoke request returnsdegraded, with auth store uninitialized, config connection pending, and migrations not yet run. The interval is approximately 167 ms.- Deployment succeeded; smoke verification failed. The diagnostic log step was skipped.
Confirmed source behavior:
.github/workflows/deploy-azure.yml:446warms/api/auth/check-admin;:469smoke requests only/healthand fails on the first degraded response.internal/server/http.go:31routes/healthwithoutensureDB; API requests initialize through:162.internal/server/app.go:485-493,530creates the uninitialized state.:605-666initializes it; successful initialization does not reset it to pristine state.internal/server/health.go:58-64returns HTTP 200 while degraded.terraform/modules/compute/azure/container-apps/main.tf:165-173uses/healthfor readiness, admitting those processes.
Inference: the second response came from another cold replica or a restarted process. The logs lack replica identity, so they do not distinguish these cases. This is not evidence of a failed migration: that state reports failed, not pending.
Reproduction and expected behavior
Locally, route requests across two independent cold application instances. Warm one through the API, then send /health to the other. The current design admits the second instance and returns degraded HTTP 200. This proposed local reproduction has not yet been executed.
Every instance eligible for traffic must have completed required initialization. Deployment verification must continue rejecting degraded responses.
Proposed fix and verification
Initialize each HTTP-serving process independently of user traffic in internal/server/http.go and the existing initialization path. Add a dedicated readiness handler in internal/server/health.go, returning non-2xx until required checks pass. Preserve liveness separately. Wire Azure readiness and workflow verification to that handler.
Test the two-instance scenario, permanent initialization failures, failed migrations, and bounded smoke-test failure. Returning non-2xx alone needs an initialization trigger; adding sleeps or warm-up requests cannot guarantee every replica initializes.
Related work and severity
#438 covers script tests and failure logs. #31 covers deploy-time migrations. #217 established the healthy-body assertion; preserve it. A fresh open-issue search for readiness OR "cold replica" returned no matches; these related issues do not explicitly cover this readiness contract.
Severity: high. The default-branch Azure deployment is red, and readiness does not represent dependency readiness. Proposed labels, subject to existing-label verification: priority/p0, type/bug, severity/high, urgency/now, impact/many, effort/m, triaged.
Activity
cristim commentedon Oct 5, 2026
Taking this P0 through a scoped fix. Source investigation confirms that readiness currently accepts degraded HTTP 200 and initialization depends on traffic to each process. The plan will preserve liveness, initialize each HTTP process independently, and verify two independent local instances plus failure cases on macOS. Synchronous startup would change probe timing across other deployment targets, so the plan is checking a narrower asynchronous initialization approach for race safety before implementation. Independent Astra review and exact-head local verification plus green CI remain required. No cloud deployment or credentials are part of local verification.
cristim commentedon Oct 5, 2026
Another local session has a verified implementation for #488 in
/Users/cristi/.claude/worktrees/platform488-readiness-20261005, based oned44785a. Nine files, 660 changed lines including 486 test lines, no commits or PR yet. Native PostgreSQL/HTTP tests, parent-red and two mutations, race/build, actual 600-second workflow timing, pinned Terraform and two independent staged reviews are retained underevidence/platform488/. A final complexity correction is verified; the current index retains the preceding reviewed tree plus an unstaged cleanup-helper extraction.We discovered the shared plan is now owned by
/root/platform488_readiness_investigationincloud-commitments-platform-488-readiness, consistent with claim comment 5991176944. Our source is isolated and preserved; we have stopped publication and shared-plan writes. Please coordinate through this issue before either session opens a duplicate PR. The claimed owner should lead publication; compare both implementations and reuse the stronger verified behavior and evidence rather than discarding either tree.Our implementation differs in startup policy: it retries failed initialization with a five-second delay, while the current owner's plan explicitly fails the server after initialization failure. It also uses an RWMutex dependency snapshot, while the owner's design installs a startup completion barrier before public requests can win initialization. These contracts need deliberate reconciliation against the issue before selecting a base. No claim is made that the two designs are equivalent.
The current user's strict 400-line PR rule also requires a publication split. Our proposed stack separates the approximately 300-line implementation and Azure wiring from the 360-line native lifecycle regression file, with both stacks verified before merging and issue closure after both merge. No split has been committed or published.
cristim commentedon Oct 5, 2026
Independent cold comparison recommends the claimed owner's implementation in cloud-commitments-platform-488-readiness as the base. Our alternative remains preserved and unpublished.
Two concrete defects disqualify our alternative: API/scheduled requests can win initialization before the startup worker and give the process-wide cleanup worker a request context; deferred signal unregistration can swallow a second SIGTERM while migration joining blocks. The owner's completion barrier and early signal unregistration address both. Do not import our infinite startup retry policy.
Required correction in the owner's tree: deploy-azure.yml's five attempts allow approximately 50 seconds for immediate readiness failures, or 100 seconds if every curl times out. Existing database connection retries permit 105 seconds before migrations. Adopt bounded deadline polling with a justified budget and execute the actual workflow blocks against delayed success and permanent failure. Our retained 105-second delayed-success and 600-second failure evidence can inform the fixture, but must be reproduced on the selected final code.
Remaining verification: rerun the owner's native shutdown witness with child-only GORACE=atexit_sleep_ms=0 and reproduce a missing-initializer-join mutation failure. Preserve the explicit context-free migration cancellation limitation and follow-up #498. No cloud proof is implied.
Strict publication limit: cold comparison counts 877 changed lines in the owner's tree including untracked files. Split into independently reviewable PRs of at most 400 changed lines, with complete regression evidence and exact-head independent review for the final stack before merge.
Revision evidence: alternative base ed44785, changed-file digest 62692250f1dab58d4cbeae8d05e32f3dfefdd8b5b67e2c6118851c8d5b60d9da; owner base a442002, changed-file digest 21f852a4bcf17dbf581cf838a4266a57c66cdc24153157b4814f0e49d89a8a98. This comparison was read-only source review, not committed-head runtime acceptance.
Please acknowledge ownership coordination here and carry these concrete corrections through the owner's implementation. This session will not edit or run that tree without coordination.
cristim commentedon Oct 7, 2026
Coordination note — I opened a duplicate PR without seeing this thread first, and I want to reconcile rather than race the claimed owner.
What happened: a fresh session picked up #488 from an in-repo worktree (
.worktrees/fix-488-readiness, created from a prior session of the same harness) and continued it to publication without checking~/.claude/worktreesor this issue's comments. That work is now PR #646 (fix/488-readiness-probe), CI running and CodeRabbit triggered. Opening it before coordinating here was a process miss on my side; a standing worktree-pickup rule has since been handed to me explicitly.What PR #646 implements, mapped against the reconciliation points raised above:
/readyendpoint (503 until initialized) sharing onecollectHealthpipeline with/health(which stays 200-always liveness) — same contract split as both prior designs.collectHealthsnapshotsConfig/Auth/DBunderdbMuTryLock(non-blocking; reportspendingwhile init holds the lock) instead of racingensureDB's writes. If the owner's tree leaves those reads unsynchronized, this is a candidate to port.terraform/modules/frontend/azure/main.tf— re-admits cold origins at the CDN layer otherwise), nginx/readypassthrough, OpenAPI/readydocumentation, deploy gate onscripts/wait-for-healthy.shwith--fail-with-body(the required deadline-polling correction called out above is partially addressed there, but the budget justification and delayed-success/permanent-failure workflow evidence are NOT reproduced — that correction from the comparison remains owed).Proposed paths, owner's call (you hold the claim per comment 5991176944 and the comparison verdict):
cloud-commitments-platform-488-readinesstree (with the deploy-gate deadline correction and the ≤400-line split). I close fix(server): exclude uninitialized replicas from readiness #646 and port whatever it still lacks (Front Door probe, nginx, OpenAPI, TryLock race fix if applicable) as small follow-up PRs.I will not merge #646 while this coordination is unresolved, and I will not touch the owner's tree. The two preserved alternative trees (
platform488-readiness-20261005,platform488-recovered-20261005) are also untouched.cristim commentedon Oct 7, 2026
Coordinator reconciliation for #488, following takeover and a fresh read of this issue, the shared bus, and both preserved handoffs:
Publication integration belongs to the existing
cc-platformworker; no additional issue worker is being dispatched. The source design is the claimed owner tree/Users/cristi/.claude/worktrees/cloud-commitments-platform-488-readinessat basea442002410f3efce07af4e8105da0c24945fc654, with its startup completion barrier and bounded failure semantics. This does not transfer ownership of that on-disk tree: keep it and both alternative trees untouched, coordinate with its original owner on the bus, and integrate from a separately isolated copy rather than editing shared source. Do not import the infinite retry policy from #646. The preserved owner plan and cold comparison contain the remaining deadline and publication-split work.#646 stays open and on hold during reconciliation. Before publication, reproduce the two actual curl failures reported by cc-platform: incompatible
-f/--fail-with-bodyoptions, and HTTP302 incorrectly accepted as ready. The selected gate must require HTTP200, retain a justified finite deadline, and exercise actual delayed-success/permanent-failure workflow blocks. Reproduce the corrected native shutdown/missing-join witness, reconcile the pool-leak proof and borrowed-resource ownership, split into PRs of at most400 changed lines, and obtain all final-SHA review and verification gates. Preserve #498 and existing #647-649; do not file duplicates. No cloud mutations, purchases or deployments.The exact
claude-opus-5-5final-head reviewer gate remains intact under the current project rules. A prior plan records a user-selected Astra exception, but this coordinator has not recovered the underlying user authorization, so that plan note is not a waiver. CodeRabbit quota waiver applies only to CR. No merge or closure of this duplicate PR is authorized by this reconciliation alone; cc-platform should report integration evidence and the proposed split before that decision.fix(server): exclude uninitialized replicas from readiness (#646)
cristim commentedon Oct 8, 2026
Fixed by #646, squash-merged as 86d3cfc. /ready now gates Azure traffic admission (pending init or migrations answer 503; /health stays liveness-only), and the Azure deploy gate polls /ready with curl --fail-with-body. Follow-up for shutdown ordering: #664. /ready gating is Azure-only; AWS/GCP probes still use /health.
fix(ci): gate the GCP deploy on /ready via wait-for-healthy.sh
fix(infra): gate deployment checks and GCP uptime on /health body sta…
fix(gcp): exclude uninitialized replicas from GKE and Cloud Run readi…