feat(compute-plane): read Dynamo v1.4.0 records and add a debug backend - #1458
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The uploader discovered closed segments but never opened one, so nothing validated that it can actually parse what Dynamo writes. Adds a record package modelling the v1.4.0 format and a streaming reader, plus a debug backend that reports what a segment contained and exports nothing. The service now hands every closed segment to the configured backend. Sources are never deleted; that waits on durable lifecycle state. The reader holds one record at a time, so segment size does not bound memory. It handles the shapes Dynamo actually produces: concatenated gzip members from rolling, both the bare and timestamp-wrapped record forms, and the three locations a request identifier can appear in. Two behaviors are deliberate rather than incidental. A record that fails to parse is counted and skipped, because one malformed line must not discard the other records in a segment. A record with an unrecognized event type is kept with its original bytes, because a Dynamo upgrade adding a type should not silently drop data. A Dynamo v1.3.x AuditRecord is detected and rejected by name. Parsing it as a request trace record would produce empty fields rather than fail, so the error says which version is required. The debug backend is linked into this binary. It has no dependencies and exports nothing, so it makes the uploader runnable against a real Dynamo with no credentials and no destination. This binary still links no exporting backend. Relates to #1004
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Included review availability: Your plan provides up to 12 included reviews per hour; 9 remain after this review. 📝 WalkthroughWalkthroughAdds Dynamo request-trace record parsing, a read-only debug backend, backend configuration and binary registration, and context-aware service support for submitting discovered segments and checking submission status. ChangesRequest trace debug flow
Estimated code review effort: 4 (Complex) | ~45 minutes Merge Risk: 🔵 Low · up to The uploader now processes every closed segment it discovers while retaining source files, so restarts or repeated scans can submit the same segment more than once and potentially duplicate downstream export work until durable lifecycle handling is added. New operational logs also lack required structured context, limiting diagnosis. The PR is mergeable with explicit owner awareness and follow-up for these bounded risks. Suggested reviewers: Sequence Diagram(s)sequenceDiagram
participant Service
participant DebugClient
participant RecordReader
participant SegmentFile
Service->>DebugClient: Submit segment path
DebugClient->>RecordReader: Open segment
RecordReader->>SegmentFile: Read gzip JSONL records
RecordReader-->>DebugClient: Return records and statistics
DebugClient-->>Service: Return debug submission ID
Service->>DebugClient: Request submission status
DebugClient-->>Service: Return successful status
🚥 Pre-merge checks | ✅ 4 | ❌ 1❌ Failed checks (1 warning)
✅ Passed checks (4 passed)
✨ Finishing Touches 💡 1📝 Generate docstrings 💡
🧪 Generate unit tests (beta)
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Actionable comments posted: 6
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Inline comments:
In `@src/compute-plane-services/request-trace-uploader/backend/debug/debug.go`:
- Around line 72-82: Update the debug backend request-handling flow around the
“debug backend read a segment” slog.Info call to include approved request,
function, cluster, and organization context without raw record identifiers. Add
tracing plus RED metrics covering submission attempts, failures, and duration,
while preserving the existing segment statistics and formatCounts output.
- Line 52: Propagate the request context through service.Run, Refresh, and
submit instead of using context.Background(), and make the record.Reader.Next
loop check ctx.Err() before each iteration. When cancellation occurs, stop
scanning and return an error wrapping ctx.Err() while preserving normal
submission behavior.
In `@src/compute-plane-services/request-trace-uploader/record/reader.go`:
- Line 66: Replace the bufio.Scanner-based logic in record.Reader.Next with a
bounded bufio.Reader loop that detects and drains lines exceeding maxLineBytes,
increments Stats.Unparseable, and continues reading subsequent records instead
of returning scan segment. Add a regression test covering an oversized line
followed by a valid record and verify the valid record is returned.
In `@src/compute-plane-services/request-trace-uploader/service/service_test.go`:
- Around line 98-104: Update stubBackend to record Submit requests and Status
identifiers, then extend TestInitializeReadinessAndDiscovery to assert the
expected interactions, including the correct segment path and status call,
ensuring Refresh invokes both backend methods.
In `@src/compute-plane-services/request-trace-uploader/service/service.go`:
- Line 36: Update the return paths in the relevant service operation, including
both lines identified around the backend calls, to wrap returned errors with
operation-specific context using %w. Preserve errors.Is and errors.As behavior
while distinguishing which backend operation failed.
- Around line 94-97: Update the slog.Error records in the request-trace upload
error paths, including the log around item.Index and the additional occurrence,
to include the available request, function, cluster, and organization ID fields
using the established structured logging convention. Preserve the existing
segment, bytes, and error fields.
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src/compute-plane-services/request-trace-uploader/backend/debug/BUILD.bazelsrc/compute-plane-services/request-trace-uploader/backend/debug/debug.gosrc/compute-plane-services/request-trace-uploader/backend/debug/debug_test.gosrc/compute-plane-services/request-trace-uploader/cmd/BUILD.bazelsrc/compute-plane-services/request-trace-uploader/cmd/main.gosrc/compute-plane-services/request-trace-uploader/config/config.gosrc/compute-plane-services/request-trace-uploader/record/BUILD.bazelsrc/compute-plane-services/request-trace-uploader/record/reader.gosrc/compute-plane-services/request-trace-uploader/record/reader_test.gosrc/compute-plane-services/request-trace-uploader/record/record.gosrc/compute-plane-services/request-trace-uploader/service/BUILD.bazelsrc/compute-plane-services/request-trace-uploader/service/service.gosrc/compute-plane-services/request-trace-uploader/service/service_test.go
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Four review findings, one of which was a correctness bug in the property this change exists to provide. bufio.Scanner fails permanently once a token exceeds its buffer, so a single record over the size bound discarded every later record in the segment. That is the opposite of the per-record isolation the reader claims. Replaced with a bounded bufio.Reader loop that drains an oversized line to its newline, counts it, and resumes at the next record. Stats gains an Oversized count so the case is visible rather than merely survived. Cancellation now reaches the read loop. Refresh and submit take a context, Refresh checks it between segments, and the debug backend checks it per record. Shutdown previously waited for a full segment scan to finish. The service test stub records what it was asked to do, so the tests can tell a submitted segment from nothing happening. Added coverage that every closed segment is submitted, that the active segment is not, that sources survive, and that a cancelled context stops the scan before any submit. Backend construction and submission errors are now wrapped with the operation that failed. Also covered a segment whose final record has no trailing newline, which the previous scanner handled incidentally and the new loop handles explicitly.
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Addressed in 96dba6a. Four fixed, two I'd like to push back on. FixedOversized line stopped the scan — the important one, and a real bug in the property this PR exists to provide. Cancellation-aware scans — Stub asserted nothing — correct, it could pass with Error wrapping — done at both sites with Pushing backTrace spans and RED metrics — these are real requirements, but they are issue #1046, deliberately sequenced after this increment in #1004's plan. Adding a half-implementation here would have to be redone when the OTLP exporter lands. Happy to be overruled if you would rather see them now. request/function/cluster/org id in logs — this one I think does not apply, and partly conflicts with our requirements. The uploader is a sidecar that reads files off a shared volume; it has no request, cluster, or org context, and never sees an inbound request. More importantly, request identifiers in exported logs are explicitly forbidden: uploader logs go over OTLP to the customer's observability backend, so identifiers and provider text stay in the on-disk quarantine record instead. That is why the debug backend reports counts and shapes only. If there is an approved non-sensitive context set I have missed, point me at it and I will carry it.
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Actionable comments posted: 3
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Inline comments:
In `@src/compute-plane-services/request-trace-uploader/backend/debug/debug.go`:
- Around line 55-57: Update the segment-reading loop in Status to check
ctx.Err() before each reader.Next() and once after the loop, including when the
segment is empty or the final Next() reaches EOF; preserve the existing wrapped
cancellation error and add tests covering an empty segment and cancellation
after the final record.
In `@src/compute-plane-services/request-trace-uploader/record/reader_test.go`:
- Around line 223-224: Update the gzip fixture setup around gz.Write and
gz.Close to check both returned errors and fail the test when either operation
fails, using the test’s existing failure mechanism.
In `@src/compute-plane-services/request-trace-uploader/service/service.go`:
- Line 75: Update Initialize to accept a context and pass it to Refresh instead
of using context.Background(). In Run, forward its ctx when invoking Initialize,
and add a test verifying initialization refresh stops or observes cancellation.
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src/compute-plane-services/request-trace-uploader/backend/debug/debug.gosrc/compute-plane-services/request-trace-uploader/record/reader.gosrc/compute-plane-services/request-trace-uploader/record/reader_test.gosrc/compute-plane-services/request-trace-uploader/service/service.gosrc/compute-plane-services/request-trace-uploader/service/service_test.go
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Three further review findings, all valid. Initialize ran the first scan with a background context, so a shutdown during startup could not stop it. It now takes a context and Run passes its own. The debug backend checked cancellation only after advancing the reader, so a cancellation landing while the final read reached the end of a segment returned success. The check now runs before each advance and once more after the loop. The gzip fixture writers in the reader tests discarded write and close errors, which errcheck reports. Both are checked and fail the test. Adds the tests the findings asked for: cancellation during initialization, cancellation during a segment read, and an empty segment.
balajinvda
approved these changes
Sep 2, 2026
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This PR is included in version 1.64.2. The release is available on GitHub release. |
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This PR is included in version 1.16.4. The release is available on GitHub release. |
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This PR is included in version 1.13.4. The release is available on GitHub release. |
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This PR is included in version 1.8.1. The release is available on GitHub release. |
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This PR is included in version 0.4.15. The release is available on GitHub release. |
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This PR is included in version 0.3.3. The release is available on GitHub release. |
kristinapathak
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Sep 4, 2026
## Why The read path lands a segment on a backend but the only linked backend, debug, exports nothing. The uploader needs a real export destination before the source can ever be deleted. ## What changed Adds backend/objectstore, a generic S3-compatible export backend with no NVIDIA-internal dependencies. It uploads each closed segment with one synchronous PutObject call and reports success once the store durably accepts it. Adds the capability declaration the backend interface was missing: ResubmitSafe, TerminalOutcomeSync, OutOfOrderTolerant, AcceptedFormats, MaxObjectBytes, and Exports. Core behavior now derives from these instead of branching on backend identity. Exports is the axis that matters most here: debug reports success without ever exporting, so it declares Exports=false and the service must never delete a source on the strength of a debug read. service.Refresh deletes a segment's source only when the backend reports StatusSuccess and Capabilities().Exports is true. A segment that fails, that is still pending, or that came from a diagnostic backend is left in place for the next scan. Adds ObjectStorePolicy to Config: bucket, region, an optional endpoint and path-style flag for non-AWS S3-compatible stores, and an optional key prefix. Bucket and region are validated by the backend's own constructor, matching how backend-specific requirements are already handled, and consistent with existing tests that load Config for the objectstore backend without those settings. Credentials come from the existing secrets-file mount as access_key_id, secret_access_key, and an optional session_token. No new credential-mount contract. ## Customer Release Notes Not customer visible. ## Plan Summary Not applicable. ## Usage REQUEST_TRACE_UPLOADER_BACKEND=objectstore REQUEST_TRACE_UPLOADER_OBJECTSTORE_BUCKET=<bucket> REQUEST_TRACE_UPLOADER_OBJECTSTORE_REGION=<region> Optional: REQUEST_TRACE_UPLOADER_OBJECTSTORE_ENDPOINT, REQUEST_TRACE_UPLOADER_OBJECTSTORE_KEY_PREFIX, REQUEST_TRACE_UPLOADER_OBJECTSTORE_PATH_STYLE. ## Testing go build, go vet, and go test ./... all pass for this module. New tests cover: missing bucket/region/credentials, unreadable secrets file, successful upload with and without a key prefix, a missing source segment, the store rejecting the upload, cancellation, and the declared capabilities. service package tests now cover source deletion on a confirmed export, retention when the backend does not export, and retention on a pending status. bazel was not available in this environment, so BUILD.bazel for the new package was hand-written to match the existing pattern in this subtree and not verified with gazelle or bazel test. MODULE.bazel.lock was not regenerated; CI may need to refresh it for the new aws-sdk-go-v2 transitive requirements this module's go.mod now pulls in. ## Notes Multipart upload for segments over 5 GiB, retry/backoff policy wiring, and async status polling are out of scope: durable lifecycle state and fault scoping (#1050) and configurable upload policy (#1051) are later increments in the #1004 delivery plan. Submit currently either succeeds durably or fails; there is no partial-upload state to clean up because PutObject is a single call. ## References Relates to #1004 Completes #1047 ## Related Pull Requests Follows #1458. ## Dependencies Adds github.com/aws/aws-sdk-go-v2 v1.41.5 and github.com/aws/aws-sdk-go-v2/service/s3 v1.97.3 (Apache-2.0, already an allowed license and already used elsewhere in this repository, for example worker-utils and grpc-proxy). Pinned to the same versions those subtrees use.
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Why
The uploader discovered closed segments but never opened one. Nothing validated that it can parse what Dynamo actually writes, and there was no way to run it end to end without a destination and credentials.
What changed
Adds a
recordpackage modelling the Dynamo v1.4.0 format with a streaming reader, and adebugbackend that reports what a segment contained and exports nothing. The service now hands every closed segment to the configured backend.Sources are never deleted. That waits on durable lifecycle state in #1050.
Reading
The reader holds one record at a time, so segment size does not bound memory. It handles the shapes Dynamo actually produces:
request.request_idonrequest_end,payload.request_idonrequest_payload, and absent on tool records, which correlate byagent_context.session_idTwo behaviors are deliberate rather than incidental:
A record that fails to parse is counted and skipped. One malformed line must not discard the other records in a segment. That is a named root cause in the internal bug behind this work.
A record with an unrecognized event type is kept with its original bytes. A Dynamo upgrade adding an event type should not silently drop data.
A Dynamo v1.3.x
AuditRecordis detected and rejected by name. Parsing it as a request trace record would produce empty fields rather than fail, so the error states the minimum supported version.The debug backend
It reads a segment, reports counts and shapes, and exports nothing. It carries no dependencies, so it is linked into this binary. That makes the uploader runnable against a real Dynamo with no credentials, no bucket, and no namespace.
Its output is counts only. Request identifiers, session identifiers, header values, and bodies are deliberately absent: it is a diagnostic aid, and its logs are subject to the same containment rules as any other uploader log.
This changes what this binary is. It previously linked no backend at all. It now links
debugand still links no exporting backend.Customer Release Notes
Not customer visible.
Plan Summary
Not applicable.
Usage
Each scan reports per segment: record count, bytes, unparseable count, unknown event types, how many records carry a request id, a session id, or headers, incomplete payloads, and a per-event-type breakdown.
Testing
go build,go vet,go test ./..., andbazel test //src/compute-plane-services/request-trace-uploader/...all pass. Seven Bazel test targets.Twelve new tests. The ones worth reading are the behavioral guarantees rather than the happy path: one bad line surrounded by good records yields both good records and an unparseable count of one; an unknown event type is retained with its original bytes; a v1.3.x AuditRecord produces an error naming v1.4.0; concatenated gzip members are read across; and the debug backend never removes its source.
Notes
Service tests now use a
NewWithBackend(cfg, client)seam so they inject a stub rather than depending on the registry. That is also useful for any caller building its own backend.The nvcf-internal distribution builds its own mains and will need a matching blank import of
backend/debugbefore its oss image can use the debug backend.Follow-on under #1004: object-store upload completes #1047, durable lifecycle in #1050, policy in #1051, Kratos in #1443, suppression in #1048, sampling in #1444, telemetry in #1046.
References
Relates to #1004
Related Pull Requests
Follows #1454.
Dependencies
None. Standard library only.
Summary by CodeRabbit