[UMBP][3/10] Add shared lookup, transfer, hybrid, and observability by charxwu · Pull Request #61791 · vllm-project/vllm

charxwu · 2026-10-15T09:23:40Z

This PR is split from the original full PR: #58568

Add compact whole-block load and store plans, plus transfer cancellation.
Coordinate asynchronous lookup with hybrid and Mamba groups. Full-attention hits stay prefix-closed, and Mamba or sparse groups restore their own state.
Add partial hash hits, KV events, eviction reporting, and transfer metrics.

Implementation only. These behaviors stay in the shared connector, above any runtime. Tests are in the next PR:

.venv/bin/python -m pytest -q \
  tests/v1/kv_connector/unit/test_umbp_async_lookup.py \
  tests/v1/kv_connector/unit/test_umbp_events.py \
  tests/v1/kv_connector/unit/test_umbp_hybrid.py

Commit: 8f4d767122. Review slice of vllm-project/vllm#58568 for RFC #57187.

AI assistance was used to draft this description. The submitting human reviews the code.

github-actions · 2026-10-15T09:28:31Z

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mergify · 2026-10-15T16:06:28Z

This pull request has merge conflicts that must be resolved before it can be
merged. Please rebase the PR, @charxwu.

https://docs.github.com/en/pull-requests/collaborating-with-pull-requests/working-with-forks/syncing-a-fork

mergify · 2026-10-20T16:58:19Z

This pull request has merge conflicts that must be resolved before it can be
merged. Please rebase the PR, @charxwu.

https://docs.github.com/en/pull-requests/collaborating-with-pull-requests/working-with-forks/syncing-a-fork

Add compact whole-block planning, transfer cancellation contracts, asynchronous lookup, hybrid and Mamba coordination, partial hash hits, KV events, metrics, and the post-review event correctness fixes. Update the existing shared connector tests and helpers for the new store masking and lookup behavior so they pass at this commit. Signed-off-by: CharlesWu <Charles.Wu@amd.com> Co-authored-by: Yichao Zhu <Yichao.Zhu@amd.com> Co-authored-by: Cursor <cursoragent@cursor.com>

Coordinate hybrid hits against the full request and actual local residency. Keep group load indices absolute so chunked-local KV is restored. Review: vllm-project#61791 (comment) Co-authored-by: Codex <noreply@openai.com> Signed-off-by: CharlesWu <Charles.Wu@amd.com>

Use core replay boundaries for retention and include aligned endpoint proof objects needed by the core hit finder. Review: vllm-project#61791 (comment) Co-authored-by: Codex <noreply@openai.com> Signed-off-by: CharlesWu <Charles.Wu@amd.com>

Separate source-pin release from asynchronous event publication. Invalidate stale attempts on removal, bound event history, and recheck published objects without starving checks under continuous stores. Review: vllm-project#61791 (comment) Co-authored-by: Codex <noreply@openai.com> Signed-off-by: CharlesWu <Charles.Wu@amd.com>

Use core hit coordination for a single sparse cache group, complete zero-transfer hits synchronously, and drain synchronous loads before FULL graph execution. Keep existing cancellation checks asynchronous. Co-authored-by: Codex <noreply@openai.com> Signed-off-by: CharlesWu <Charles.Wu@amd.com>

Check that BlockStoreBatch stores go through the worker's store_blocks fast path and the materialized fallback with the same rank-local keys and unchanged request metadata, without rewriting the scheduler's batch, and that a partly failed store suppresses publication and reports every object in the job as failed. Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_012gT5Wcmb4nZi6FqqiDPUmK Signed-off-by: tjtanaa <tunjian.tan@embeddedllm.com>

Adapt test_embedded_runtime_register_store_and_load to the compact load/store batches: scheduler-built store metadata goes through a real worker into MemoryRuntime, and scheduler-built load metadata restores source blocks 1/2 into different destination blocks 5/6 on a separate worker, with byte equality checked for both layers and no stray writes. Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com> Signed-off-by: tjtanaa <tunjian.tan@embeddedllm.com>

tjtanaa

LGTM, thanks for the update! I also pushed two quick test additions to the branch:

Compact store (fast vs fallback): Verifies BlockStoreBatch behaves identically across both paths (same keys, metadata, scheduler batch, and success/failure handling).
Byte round-trip is back: Updated test_embedded_runtime_register_store_and_load for compact batches. Real workers push data through MemoryRuntime, checking byte-for-byte parity on blocks 1/2 -> 5/6 with zero side effects.

github-actions · 2026-10-24T09:24:21Z

✅ @charxwu, CI is now available for this PR.

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mergify · 2026-10-24T09:29:22Z

Hi @charxwu, the pre-commit checks have failed. Please run:

uv pip install pre-commit>=4.5.1
pre-commit install
pre-commit run --all-files

Then, commit the changes and push to your branch.

For future commits, pre-commit will run automatically on changed files before each commit.

Assigning store/store_blocks on the recording handle trips mypy's method-assign and attr-defined checks in pre-commit. Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com> Signed-off-by: tjtanaa <tunjian.tan@embeddedllm.com>

charxwu · 2026-10-24T11:37:15Z

/ci run

github-actions · 2026-10-24T11:37:41Z

✅ Triggered Buildkite CI #97039 for commit b5acea459849.

ℹ️ This PR is 2 commits behind upstream main. Merged upstream main into this branch as b5acea459849 before starting CI. Pull the branch before pushing more changes.

…llm-project#61791) Signed-off-by: CharlesWu <Charles.Wu@amd.com> Signed-off-by: tjtanaa <tunjian.tan@embeddedllm.com> Co-authored-by: Yichao Zhu <Yichao.Zhu@amd.com> Co-authored-by: tjtanaa <tunjian.tan@embeddedllm.com>

mergify Bot added the kv-connector label Oct 15, 2026

This was referenced Oct 15, 2026

[Feature][KV Connector] Add UMBPStoreConnector for embedded and standalone DRAM #58568

Draft

[KV Connector] UMBPStoreConnector for shared, embedded, and standalone DRAM offload charxwu/vllm#7

Draft

charxwu marked this pull request as ready for review October 15, 2026 09:28

charxwu requested review from ApostaC, NickLucche, ivanium, orozery, wzhao18 and xuechendi as code owners October 15, 2026 09:28

claude Bot reviewed Oct 15, 2026

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mergify Bot added the needs-rebase label Oct 15, 2026

charxwu force-pushed the review/umbp-split-2a-lookup branch from 8f4d767 to 2222bb1 Compare October 20, 2026 05:42

mergify Bot removed the needs-rebase label Oct 20, 2026

mergify Bot added the needs-rebase label Oct 20, 2026

charxwu force-pushed the review/umbp-split-2a-lookup branch from 2222bb1 to f25e403 Compare October 21, 2026 07:06

mergify Bot removed the needs-rebase label Oct 21, 2026

tjtanaa reviewed Oct 22, 2026

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Comment thread vllm/distributed/kv_transfer/kv_connector/v1/umbp/scheduler.py Resolved

Comment thread vllm/distributed/kv_transfer/kv_connector/v1/umbp/scheduler.py Resolved

Comment thread vllm/distributed/kv_transfer/kv_connector/v1/umbp/scheduler.py Resolved

tjtanaa added the verified Run pre-commit for new contributors without triggering other tests label Oct 22, 2026

charxwu and others added 4 commits October 23, 2026 01:40

charxwu requested a review from tjtanaa October 23, 2026 09:02

tjtanaa and others added 2 commits October 24, 2026 08:29

tjtanaa approved these changes Oct 24, 2026

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tjtanaa added ready ONLY add when PR is ready to merge/full CI is needed rocm Related to AMD ROCm labels Oct 24, 2026

github-project-automation Bot added this to AMD Oct 24, 2026

github-project-automation Bot moved this to Todo in AMD Oct 24, 2026

Merge branch 'main' into review/umbp-split-2a-lookup

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tjtanaa enabled auto-merge (squash) October 24, 2026 09:24

tjtanaa disabled auto-merge October 24, 2026 09:24

tjtanaa enabled auto-merge (squash) October 24, 2026 09:25

Merge branch 'main' into review/umbp-split-2a-lookup

b5acea4

tjtanaa merged commit c0f9fff into vllm-project:main Oct 24, 2026
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github-project-automation Bot moved this from Todo to Done in AMD Oct 24, 2026

charxwu mentioned this pull request Oct 25, 2026

[Test][UMBP][4/10] Cover async lookup, hybrid cache, events, and metrics #61792

Merged

richard-for-bugen Bot mentioned this pull request Oct 28, 2026

[Rust Frontend] Export UMBP connector transfer metrics like Python BugenZhao/vllm#74

Closed

shen-shanshan mentioned this pull request Oct 29, 2026

[ROCm][UMBP] Support UMBP standalone mode for DeepSeek-V4-Pro #63002

Draft

BugenZhao mentioned this pull request Oct 29, 2026

[Rust Frontend] Export UMBP connector transfer metrics like Python #64512

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[UMBP][3/10] Add shared lookup, transfer, hybrid, and observability - #61791

[UMBP][3/10] Add shared lookup, transfer, hybrid, and observability#61791
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