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[Rust Frontend][gRPC] Add engine-aware health reporting - #48992

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BugenZhao merged 2 commits into
vllm-project:mainfrom
connorcarpenter15:feat/grpc-health-upstream
Jul 21, 2026
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[Rust Frontend][gRPC] Add engine-aware health reporting#48992
BugenZhao merged 2 commits into
vllm-project:mainfrom
connorcarpenter15:feat/grpc-health-upstream

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@connorcarpenter15

@connorcarpenter15 connorcarpenter15 commented Jul 17, 2026 •
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Purpose

Expose the standard grpc.health.v1.Health service on the existing Rust frontend gRPC listener.

  • Register health on the same listener as vllm.Generate.
  • Report the overall server and vllm.Generate as SERVING after startup.
  • Publish the engine client's sticky healthy-to-unhealthy transition through a Tokio watch channel.
  • Report NOT_SERVING when the engine becomes unhealthy or shutdown begins.
  • Keep active health streams open after engine failure so clients receive the status transition.
  • Close health streams during graceful shutdown so they do not delay server termination.
  • Emit structured health-transition logs with stable, actionable reasons.

This adds no listener, port, or vLLM-specific health protocol.

Test Plan

  • cargo fmt --all -- --check
  • git diff --check
  • CARGO_INCREMENTAL=0 cargo test -j 2 -p vllm-server 'grpc::tests::' -- --nocapture
  • CARGO_INCREMENTAL=0 cargo test -j 2 -p vllm-engine-core-client --lib

Test Result

  • Rust formatting and whitespace checks passed.
  • 21 gRPC server tests passed.
  • 93 engine-core client tests passed.
  • The graceful-shutdown regression test verifies that an active health watch receives NOT_SERVING, closes, and allows the server task to finish within the timeout.
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.
  • No documentation update is required; this implements the standard gRPC health protocol on the existing listener.

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@mergify mergify Bot added the rust label Jul 17, 2026
@connorcarpenter15
connorcarpenter15 force-pushed the feat/grpc-health-upstream branch from 32c548c to 9ac66dc Compare July 17, 2026 22:27
@connorcarpenter15
connorcarpenter15 marked this pull request as ready for review July 17, 2026 22:28
claude[bot]
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This pull request is from a fork — automated review is disabled. A repository maintainer can comment @claude review to run a one-time review.

@connorcarpenter15 connorcarpenter15 changed the title feat(grpc): add engine-aware health reporting [Rust Frontend] add engine-aware health reporting Jul 17, 2026
@connorcarpenter15 connorcarpenter15 changed the title [Rust Frontend] add engine-aware health reporting [Rust Frontend] Add engine-aware health reporting Jul 17, 2026
@BugenZhao BugenZhao changed the title [Rust Frontend] Add engine-aware health reporting [Rust Frontend][gRPC] Add engine-aware health reporting Jul 20, 2026
BugenZhao
BugenZhao approved these changes Jul 20, 2026
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Rest LGTM. Thanks!

Comment thread rust/src/server/src/lib.rs Outdated
@connorcarpenter15
connorcarpenter15 force-pushed the feat/grpc-health-upstream branch from 9ac66dc to b0a4b89 Compare July 20, 2026 12:25
njhill
njhill reviewed Jul 20, 2026
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Thanks @connorcarpenter15, also lgtm, just some minor comments.

Comment thread rust/src/engine-core-client/src/client/imp.rs
Comment thread rust/src/engine-core-client/src/client/imp.rs
Comment thread rust/Cargo.toml Outdated
@connorcarpenter15
feat(grpc): add engine-aware health reporting
86f0943 
Expose the standard gRPC health service on the existing Rust frontend listener and publish engine health transitions through it. Keep health monitoring under the gRPC module and ensure active health watches observe unhealthy and shutdown states without delaying graceful termination.

Co-authored-by: OpenAI Codex <codex@openai.com>

Signed-off-by: Connor Carpenter <connorc@nvidia.com>
@connorcarpenter15
connorcarpenter15 force-pushed the feat/grpc-health-upstream branch from b0a4b89 to 86f0943 Compare July 20, 2026 16:51
njhill
njhill approved these changes Jul 20, 2026
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Thanks @connorcarpenter15

@njhill njhill added the ready ONLY add when PR is ready to merge/full CI is needed label Jul 20, 2026
@connorcarpenter15 connorcarpenter15 mentioned this pull request Jul 20, 2026
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@BugenZhao
BugenZhao merged commit 1940c84 into vllm-project:main Jul 21, 2026
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ArjunPakhan pushed a commit to ArjunPakhan/vllm that referenced this pull request Jul 21, 2026
@connorcarpenter15 @mergify @ArjunPakhan
[Rust Frontend][gRPC] Add engine-aware health reporting (vllm-project…
a775951 
…#48992)

Co-authored-by: mergify[bot] <37929162+mergify[bot]@users.noreply.github.com>
Signed-off-by: Connor Carpenter <connorc@nvidia.com>
@swjeong9 swjeong9 mentioned this pull request Aug 13, 2026
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@njhill njhill njhill approved these changes
@BugenZhao BugenZhao BugenZhao approved these changes

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