fix(kubernetes): operator marks completion of aiperfjob even if the spec contains <, > or &

[Okamille]

Summary

If a job's spec contained <, > or & (for example sh -c "echo hi > /tmp/x"), the operator could never finish it. The completion claim failed with 422 on every tick, so the job stayed in Running forever. The stable-blocker cleanup claim failed the same way.

Related issue

#1488

Root cause

Both claims used an RFC 6902 test op as their atomic precondition, and each tested a whole document built from user input:

• _build_claim_patch_ops (client_cache.py) tested the whole /metadata/annotations map. That map includes kopf's kopf.zalando.org/last-handled-configuration, which is a serialized copy of the user's spec.
• _startup_failure_claim_ops (monitor.py) tested /spec and /metadata/annotations as whole documents.

The apiserver compares scalar test values by their raw JSON bytes. Go's encoder escapes <, > and & as <, > and &, but Python's json.dumps leaves them alone. So the string stored in the annotation never matched the one the operator sent, and the test op always failed.

Fix

• Completion claim: when the snapshot has a resourceVersion (every body read from the apiserver does), the precondition is now /metadata/resourceVersion. The claim is still exactly-once, because any concurrent write bumps the resourceVersion. The old whole-map or whole-metadata tests only run for bodies with no resourceVersion. The builder also has a single linear code path now instead of two duplicated return branches.
• Stable-blocker claim: removed the /spec and /metadata/annotations tests. The existing /metadata/resourceVersion test already pins both. The add /metadata/annotations {} op for parents with no annotations is kept.

Tests

• test_client_cache.py:
  • An annotation map holding a last-handled-configuration with >, < and & now produces only uid + resourceVersion tests, followed by the claim add.
  • A second patch built from the same snapshot fails once the resourceVersion has changed, so two ticks can't both win the claim.
• test_event_driven_recovery.py:
  • _startup_failure_claim_ops never tests /spec or /metadata/annotations.
  • It still creates the annotations parent when it is missing.
• test_completion_claim_adversarial.py: the fake apiserver now bumps resourceVersion on every successful patch, like the real one, so the RV precondition is actually exercised.

How was this tested ?

 kind create cluster --name aiperf
 kubectl apply -f dev/deploy/mock-server.yaml
 kubectl apply --server-side -f \\n  https://github.com/kubernetes-sigs/jobset/releases/latest/download/manifests.yaml
 kind load docker-image aiperf:pr aiperf-mock-server:latest --name aiperf
 kubectl apply -f dev/deploy/mock-server.yaml
 helm upgrade --install aiperf-operator deploy/helm/aiperf-operator -n aiperf-system --create-namespace  --set image.repository=aiperf --set image.tag=pr --set image.pullPolicy=Never
kubectl apply -f artifacts/claim-repro.yaml

Summary by CodeRabbit

• Bug Fixes
  • Improved reliability of completion and startup-failure claims when annotations are missing or contain special characters.
  • Claim updates now check that resource information is current, helping prevent stale changes.
  • Reduced claim update failures caused by unrelated or user-provided annotation content.
  • Startup-failure claims can be recorded when annotations are absent; the required annotations are initialized automatically.
  • These changes help ensure claims are recorded consistently without being blocked by unrelated metadata.

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Try out this PR

Quick install:

pip install --upgrade --force-reinstall git+https://github.com/ai-dynamo/aiperf.git@09aa6a11ffa6dd12835a8340252959a65c6a680c

Recommended with virtual environment (using uv):

uv venv --python 3.12 && source .venv/bin/activate
uv pip install --upgrade --force-reinstall git+https://github.com/ai-dynamo/aiperf.git@09aa6a11ffa6dd12835a8340252959a65c6a680c

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Last updated for commit: 09aa6a1 • Browse code

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📒 Files selected for processing (2)

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---

Walkthrough

Completion and startup-failure claim patches use JSON Patch preconditions. Completion patches prefer resource-version checks. Startup-failure patches retain UID, resource-version, and phase checks. Both paths add annotations when the annotations map is absent.

Changes

Claim patch construction

Layer / File(s)	Summary
Completion claim patch construction src/aiperf/operator/client_cache.py, tests/unit/operator/test_client_cache.py, tests/unit/operator/test_completion_claim_adversarial.py	Completion claim patches test resource version when present. Otherwise, they test a metadata snapshot when annotations are absent or an annotations snapshot when present. Tests cover escaped annotation values and resource-version updates.
Startup-failure claim patch construction src/aiperf/operator/handlers/monitor.py, tests/unit/operator/handlers/test_event_driven_recovery.py	Startup-failure claim operations retain UID, resource-version, and phase tests. They no longer test spec, status.startupIssue, or the full annotations object. Tests cover claim creation and missing annotations.

Priority: ➖ Normal

Estimated code review effort: 2 (Simple) | ~15 minutes

Merge Risk: ⚪ Minimal · up to 09aa6

The claim changes preserve concurrency protection and existing annotations while avoiding comparisons of user-supplied documents. No actionable merge-blocking issue was found; merge after normal checks pass.

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Check name	Status	Explanation
Docstring Coverage	✅ Passed	Docstring coverage is 81.82% which is sufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 11 functions across 5 files.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.
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Title check	✅ Passed	The title clearly describes the main change: fixing Kubernetes operator completion claims when the job spec contains special characters.

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Inline comments:
Review comments at @src/aiperf/operator/handlers/monitor.py:
- Around line 1997-1998: Remove the whole-object startupIssue test from the
status patch construction in the _claim_startup_failure flow, including the test
that deep-copies STARTUP_ISSUE_STATUS_KEY. Keep the resourceVersion test as the
snapshot guard and preserve the existing startup-issue removal operation.

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📒 Files selected for processing (5)

• src/aiperf/operator/client_cache.py
• src/aiperf/operator/handlers/monitor.py
• tests/unit/operator/handlers/test_event_driven_recovery.py
• tests/unit/operator/test_client_cache.py
• tests/unit/operator/test_completion_claim_adversarial.py

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[dynamo-review-agent]

Previously reported defects still present:

• Original discussion: The startup-failure claim still tests the whole /status/startupIssue object via deepcopy(status.get(STARTUP_ISSUE_STATUS_KEY)); a diagnostic message containing <, > or & can still hit the same JSON Patch scalar escaping mismatch that this PR removes for spec and annotations, while /metadata/resourceVersion already pins the snapshot.
• Original discussion: The whole-object /status/startupIssue JSON-patch test remains at monitor.py:1995-1999. Because that object includes the Kubernetes diagnostic message, it can still contain <, > or & and reproduce the escaping mismatch this PR removes from spec and annotations; the existing resourceVersion test already fences the snapshot.
• Original discussion: Verified: _startup_failure_claim_ops still tests the entire status.startupIssue object, whose message is a Kubernetes diagnostic string accepted without character restrictions. A <, > or & in that message can retain the same JSON-escaping mismatch this PR fixes elsewhere, yielding repeated 422 claim failures; the resourceVersion test already fences this snapshot.