fix(stargate): aggregate shared-cluster request stats - #1448
fix(stargate): aggregate shared-cluster request stats#1448barrygreengus wants to merge 9 commits into
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🛡️ CodeQL Analysis🚨 Found 5 issue(s) Severity Breakdown:
📋 Top Issues🔗 View full details in Security tab 🕐 Last updated: 2026-09-01 17:25:59 UTC | Commit: a9052ad |
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Included review availability: Your plan provides up to 12 included reviews per hour; 10 remain after this review. 📝 WalkthroughWalkthroughStargate now aggregates validated load statistics across all active backends in a shared cluster. It combines workload counters and priority estimates, copies shared engine statistics, and updates routing-state tests without proxy-local capability branching. ChangesShared-cluster aggregation
Estimated code review effort: 4 (Complex) | ~45 minutes Merge Risk: 🔵 Low · up to The change aggregates routing statistics across capable backends, improving load and queue estimates. Merge is reasonable with owner awareness that the capability marker’s trust semantics should remain documented and intentionally non-security-sensitive. Sequence Diagram(s)sequenceDiagram
participant BackendStats
participant ClusterAggregation
participant ClusterSnapshot
participant LoadBalancer
BackendStats->>ClusterAggregation: workload, TPS, priority, and engine statistics
ClusterAggregation->>ClusterSnapshot: aggregated ModelStats and wait-time map
ClusterSnapshot->>LoadBalancer: shared-cluster routing state
LoadBalancer-->>ClusterSnapshot: queue-time routing result
🚥 Pre-merge checks | ✅ 3 | ❌ 2❌ Failed checks (2 warnings)
✅ Passed checks (3 passed)
Full details: Linked Issues checkExplanation The PR implements shared-stat aggregation and related reservation, removal, saturation, and priority-map behavior for [ Full details: Docstring CoverageExplanation Docstring coverage is 57.89% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 19 functions across 2 files. (1 skipped: 1 unsupported.) Full details: Title checkExplanation The title uses the valid Conventional Commits format
✨ Finishing Touches 💡 1📝 Generate docstrings 💡
🧪 Generate unit tests (beta)
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Inline comments:
In
`@src/libraries/rust/stargate/crates/stargate/src/routing_state/cluster_snapshots.rs`:
- Around line 169-171: Update the shift handling in the routing-state snapshot
calculation to reject shifts that discard significand bits, rather than relying
solely on checked_shl; ensure values such as 2^128 cannot become an accepted
zero weight. Extend
proxy_local_priority_weights_resolve_integer_ceiling_boundaries with the 2^-76
and 1.0 case using waits 0 and 100.
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src/libraries/rust/stargate/crates/stargate/src/routing_state/cluster_snapshots.rssrc/libraries/rust/stargate/crates/stargate/src/routing_state/tests.rs
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Signed-off-by: Barry Greengus <bgreengus@nvidia.com>
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Signed-off-by: Barry Greengus <bgreengus@nvidia.com>
Signed-off-by: Barry Greengus <bgreengus@nvidia.com>
barrygreengus
changed the title
1 participant
Why
When multiple proxy-local Pylons advertise the same model and cluster, Stargate can retain request statistics from only the latest backend. This under-represents cluster request load and can produce queue estimates that ignore active work on other backends.
The matching Pylon and Stargate changes deploy together, so this change does not include a mixed-version capability gate or legacy fallback path.
What changed
Customer Release Notes
Stargate now accounts for request load from every Pylon in a shared cluster, improving routing and queue-time estimates.
Plan Summary
No infrastructure, chart, or resource changes. Deploy this Stargate change together with the matching Pylon lifecycle and throughput changes in #1452 and #1457.
Usage
Not applicable.
Testing
rustfmt --edition 2024 --checkon the changed Rust filescargo clippy -p stargate --all-targets -- -D warningscargo test -p stargate --lib routing_state::tests: 61 passedcargo test -p stargate: 351 library, 52 main binary, 18 probe, 3 CLI, and 142 integration tests passedcargo test --workspaceandcargo clippy -p stargate -p pylon-lib -p pylon --all-targets -- -D warningspassed.cargo fmt --all --checkalso reports formatting drift in untouched Stargate files. Every file changed by this Pull Request passes the pinned formatter.QA is not required beyond the automated Stargate suite.
Notes
There is no compatibility marker or mixed-version behavior for this request-load contract. There are no logging, tracing, metrics, dashboard, alert, or diagram changes.
Issues
Closes #1447
References
Related Pull Requests
Dependencies
None. No license or NOTICE changes are required.