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[Rust Frontend][gRPC] Add abort control RPC - #49255

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BugenZhao merged 5 commits into
vllm-project:mainfrom
connorcarpenter15:feat/grpc-abort-upstream
Jul 22, 2026
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[Rust Frontend][gRPC] Add abort control RPC#49255
BugenZhao merged 5 commits into
vllm-project:mainfrom
connorcarpenter15:feat/grpc-abort-upstream

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@connorcarpenter15

@connorcarpenter15 connorcarpenter15 commented Jul 20, 2026

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Purpose

Add an idempotent gRPC control RPC for aborting active Rust frontend requests by ID.

  • Add vllm.Control.Abort with repeated request IDs and an empty response.
  • Register vllm.Control on the existing gRPC listener.
  • Resolve caller-facing request IDs through the frontend's external-to-internal request-ID mapping before aborting EngineCore work.
  • Treat empty, unknown, repeated, and completed request IDs as successful no-ops.
  • Report vllm.Control through the canonical gRPC health service.

This adds no listener, port, or CLI argument. It is stacked on #48992 and should be reviewed after that PR.

Test Plan

  • cargo fmt --all -- --check
  • git diff --check origin/feat/grpc-health-upstream...HEAD
  • CARGO_INCREMENTAL=0 cargo test -j 2 -p vllm-server 'grpc::tests::' -- --nocapture

Test Result

  • Rust formatting and whitespace checks passed.
  • All 22 gRPC server tests passed.
  • The Abort integration test uses production-default request-ID randomization and verifies external-ID resolution, empty-list no-op behavior, duplicate and unknown IDs, successful cancellation, and repeated-call idempotency.

Essential Elements of an Effective PR Description Checklist
  • The purpose of the PR, such as "Fix some issue (link existing issues this PR will resolve)".
  • The test plan, such as providing test command.
  • The test results, such as pasting the results comparison before and after, or e2e results
  • (Optional) The necessary documentation update, such as updating supported_models.md and examples for a new model.

AI assistance disclosure: This PR was authored with AI assistance and reviewed by the submitter.

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@mergify mergify Bot added the rust label Jul 20, 2026
connorcarpenter15 and others added 3 commits July 21, 2026 02:57
Add an idempotent control RPC for aborting active requests by ID on the existing gRPC listener. Register the control service with canonical health reporting and cover active and no-op abort behavior.

Co-authored-by: OpenAI Codex <codex@openai.com>
Signed-off-by: Connor Carpenter <connorc@nvidia.com>
Signed-off-by: Connor Carpenter <connorc@nvidia.com>
Signed-off-by: Connor Carpenter <connorc@nvidia.com>
@BugenZhao
BugenZhao force-pushed the feat/grpc-abort-upstream branch from a32f0f2 to be95071 Compare July 21, 2026 02:57

@BugenZhao BugenZhao left a comment

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Rest LGTM. Thanks!

Comment thread rust/src/server/src/grpc/health.rs Outdated
Comment on lines +49 to +52
/// gRPC control service backed by the shared application state.
pub struct ControlServiceImpl {
state: Arc<AppState>,
}

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It would still be great if we could make each service a separate module/file!

Comment on lines +67 to +69
if request_ids.is_empty() {
return Ok(Response::new(pb::AbortResponse {}));
}

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There was a recent change on the semantics of empty list: now it cancels all in-flight requests (although there could be some race cases), so we get some misalignments here. cc @njhill WDYT of the desired behavior here?

// Empty/missing `request_ids` aborts all in-flight requests.
let request_ids = body.request_ids.unwrap_or_default();

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Yes agree it would be better to have this be a no-op. Is the "abort all" behavior really needed, I don't think we have it in the existing abort apis. Maybe we could leave it out for now and consider as a follow-on.

@BugenZhao BugenZhao changed the title feat(grpc): add abort control RPC [Rust Frontend][gRPC] Add abort control RPC Jul 21, 2026
Signed-off-by: Connor Carpenter <connorc@nvidia.com>
@connorcarpenter15
connorcarpenter15 marked this pull request as ready for review July 21, 2026 20:09

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Claude Code Review

This pull request is from a fork — automated review is disabled. A repository maintainer can comment @claude review to run a one-time review.

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@codex review

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Codex Review: Didn't find any major issues. What shall we delve into next?

Reviewed commit: ad7bb8fb1c

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Thanks!

@BugenZhao BugenZhao added the ready ONLY add when PR is ready to merge/full CI is needed label Jul 22, 2026
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BugenZhao enabled auto-merge (squash) July 22, 2026 09:06
@BugenZhao
BugenZhao merged commit c79ad3a into vllm-project:main Jul 22, 2026
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3 participants