OCPBUGS-99762: retry Azure bootstrap ignition upload - #10835
OCPBUGS-99762: retry Azure bootstrap ignition upload#10835redhat-chai-bot wants to merge 2 commits into
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Token-credential uploads can briefly receive data-plane authorization errors while access to a newly created storage account propagates. Retry only those responses for a bounded interval while preserving immediate failure for shared-key and unrelated errors. Related: OCPBUGS-99762
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No actionable comments were generated in the recent review. 🎉 ℹ️ Recent review info⚙️ Run configurationConfiguration used: Repository YAML (base), Central YAML (inherited) Review profile: CHILL Plan: Team Run ID: 📒 Files selected for processing (1)
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Included review availability: Your plan provides up to 4 included reviews per hour; 2 remain after this review. 📝 WalkthroughWalkthroughChangesAzure block blob upload retries
Estimated code review effort: 3 (Moderate) | ~20 minutes Merge Risk: ⚪ Minimal · up to The PR adds bounded Azure authorization retries while preserving existing failure behavior; no actionable merge-blocking risk remains after normal checks and review. 🚥 Pre-merge checks | ✅ 14 | ❌ 1❌ Failed checks (1 warning)
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Full details: Stable And Deterministic Test NamesExplanation PASS. The added tests use Go's Full details: Test Structure And QualityExplanation PASS: The pull request adds standard Go Full details: Microshift Test CompatibilityExplanation PASS — The PR adds a Go unit test file, not new Ginkgo e2e tests. The tests use Full details: Single Node Openshift (Sno) Test CompatibilityExplanation PASS: The pull request adds only standard Go unit tests in Full details: Topology-Aware Scheduling CompatibilityExplanation PASS: The pull request changes only Azure block-blob upload retry logic and unit tests. The exact diff adds no deployment manifests, operators, controllers, replicas, affinity, topology spread, node selectors, tolerations, or PDBs. Therefore, the topology-aware scheduling check is not applicable. Full details: Ote Binary Stdout ContractExplanation PASS: The PR changes only Azure storage code and unit tests. It adds one Full details: Ipv6 And Disconnected Network Test CompatibilityExplanation The pull request adds a standard Go unit test file, not Ginkgo e2e tests. The tests use an in-memory upload mock and do not use IPv4 literals, IP parsing, network URLs, public hosts, DNS, or external connections. The changed implementation also adds no such test requirement. Full details: No-Weak-CryptoExplanation PASS. The pull request changes only Azure blob upload retry logic and tests. The added code introduces no MD5, SHA1, DES, 3DES, RC4, Blowfish, or ECB usage, no custom cryptographic implementation, and no comparison of secret or token values. Comparisons are limited to retry state, credential-mode flags, HTTP status, and Azure error codes. Full details: Container-PrivilegesExplanation PASS: The pull request changes only Full details: No-Sensitive-Data-In-LogsExplanation PASS: The only new log statement records the allowlisted Azure error code (
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Inline comments:
In `@pkg/infrastructure/azure/storage.go`:
- Line 581: Update the ExponentialBackoffWithContext configuration in
uploadBlockBlobWithRetry to set Factor to 2 instead of 1, while preserving the
existing retry count and initial delay.
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pkg/infrastructure/azure/storage.gopkg/infrastructure/azure/storage_test.go
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Use exponential delays to give Azure storage authorization more time to propagate while retaining the existing bounded retry count. Related: OCPBUGS-99762
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| attempts := 0 | ||
| err := wait.ExponentialBackoffWithContext(ctx, backoff, func(ctx context.Context) (bool, error) { | ||
| attempts++ | ||
| _, lastErr = client.Upload(ctx, streaming.NopCloser(bytes.NewReader(data)), options) |
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@CodeRabbit does client.Upload and the azure sdk natively support retries (so we don't have to roll our own retry loop)? If so, what are the retry options currently being used?
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🧩 Analysis chain
🏁 Script executed:
#!/bin/bash
set -euo pipefail
printf '%s\n' '=== Azure SDK dependency versions ==='
rg -n -C2 'azure-sdk-for-go/sdk/(azcore|storage/azblob)' go.mod go.sum || true
printf '%s\n' '=== Retry configuration supplied by Azure storage clients ==='
ast-grep outline pkg/infrastructure/azure/storage.go --items all --type function --match 'createBlockBlob|CreateBlockBlob'
sed -n '525,670p' pkg/infrastructure/azure/storage.go
printf '%s\n' '=== Other explicit azcore retry configurations ==='
rg -n -C3 '\bRetry\s*:' --glob '*.go' .
printf '%s\n' '=== Installed azcore retry-policy source ==='
modcache="$(go env GOMODCACHE 2>/dev/null || true)"
if [ -n "$modcache" ] && [ -d "$modcache" ]; then
fd -a -i 'policy.go' "$modcache/github.com/!azure/azure-sdk-for-go/sdk/azcore@" \
-x sh -c 'rg -n -C4 "type RetryOptions|func NewRetryPolicy|StatusCodes|MaxRetries|TryTimeout|RetryDelay|MaxRetryDelay" "$1"' sh {} \
|| true
else
echo "Go module cache is unavailable."
fiLength of output: 9425
🤖 web_search executed:
For github.com/Azure/azure-sdk-for-go/sdk/azcore v1.21.1, what are policy.RetryOptions default values, which HTTP status codes are retried by the default retry policy, and can HTTP 403 be added through StatusCodes? Cite the versioned source or documentation.
Length of output: 13401
@patrickdillon, yes. blockblob.Client.Upload uses the Azure SDK pipeline retry policy.
The current blockblob.Client configuration sets only Cloud. It does not set policy.ClientOptions.Retry. The effective SDK defaults are:
MaxRetries: 3— up to four total HTTP attempts.TryTimeout: 0— disabled.RetryDelay: 800ms— exponential backoff.MaxRetryDelay: 60s.- Retryable status codes: 408, 429, 500, 502, 503, and 504.
The native policy does not retry HTTP 403. Therefore, it does not handle AuthorizationPermissionMismatch or AuthorizationFailure while RBAC authorization propagates.
We could configure RetryOptions.StatusCodes to include 403, but that replaces the default status-code list and would retry all 403 responses. RetryOptions.ShouldRetry could implement the same 403/error-code filter as this helper. The explicit loop is narrower: it preserves the SDK retries for transient transport and service failures, then retries only the two qualifying token-credential authorization failures.
Sources: azcore retry options, Azure Storage Go retry policy.
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Yes — blockblob.Client.Upload uses the Azure SDK pipeline retry policy. For this PR's azblob v1.6.3 / azcore v1.21.1, the clients currently configure only the cloud; they do not override policy.ClientOptions.Retry. The effective defaults are:
MaxRetries: 3(up to four total HTTP attempts)TryTimeout: 0(disabled)RetryDelay: 800mswith exponential backoffMaxRetryDelay: 60s- default retry status codes:
408,429,500,502,503, and504
The default policy does not retry 403, so it does not cover AuthorizationPermissionMismatch or AuthorizationFailure during authorization propagation. RetryOptions.StatusCodes could add 403, but that replaces the default list and would retry every 403; ShouldRetry could filter by error code, but that would be a client-level policy.
The explicit helper is intentionally narrow: it preserves the SDK's native retries for normal transport/service failures, then adds retries only for the two qualifying token-credential authorization responses. Shared-key uploads and unrelated authorization failures remain fail-fast.
Sources: azcore retry options and Azure Storage Go retry policy.
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The intended case is a transient authorization-propagation 403, not a permanent permission denial. The upload targets a storage account created during the same install; if the token-credential data-plane permission is not visible yet, Azure can return AuthorizationPermissionMismatch or AuthorizationFailure. Waiting and retrying the same upload is intended to move the request past that propagation window.
The helper is deliberately bounded and narrow: it applies only to token-credential uploads and those two Azure error codes, with exponential backoff. Shared-key uploads and unrelated authorization failures still fail fast.
I do not have a direct reproduction showing the same upload transition from one of these 403s to success; the evidence is the repeated CI failure signature plus the just-created-storage-account path. I agree the PR should remain held until the team confirms that mechanism or chooses a simpler/native retry design. I will not push further changes while the hold is active.
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@redhat-chai-bot how would retrying help with an authorization error? |
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/hold not clear to me this fixes anything and it adds substantial complexity |
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/hold cancel this makes sense, apparently the Data Contributor Role needs to propagate to the newly created resource (even though it is granted at the subscription level) |
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This pull request was generated by the Product Reliability Agent. To help us improve product stability and CI, please focus review on functional correctness and material concerns. The agent will automatically address feedback, but we’d appreciate keeping non-blocking nits from delaying an otherwise correct PR. Within two business days, please merge, provide blocking feedback, or close the PR with a reason.
Summary
Reliability rationale
The failure mode has recurred in Azure installer CI job history, including the current development line, rather than being a one-off report. A bounded retry addresses the authorization-propagation window and is intended to reduce avoidable installation failures and repeat CI work while preserving fail-fast behavior for genuine permission errors.
Validation
IS_CONTAINER=TRUE ./hack/go-fmt.sh .go test ./pkg/infrastructure/azure/... -count=1go vet ./pkg/infrastructure/azure/..../hack/go-lint.sh ./pkg/infrastructure/azure/...git diff origin/main...HEAD --checkAll listed checks passed.
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