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[None][fix] Resolve attention DP dummy roles from queued requests - #20325

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dongfengy:codex/glm-upstream-p01-adp-role-20261014
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dongfengy:codex/glm-upstream-p01-adp-role-20261014

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@dongfengy dongfengy commented Oct 14, 2026 •

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Description

#13900 moved ADP dummy-role detection from validated_requests, which already contained LlmRequest objects, into _update_adp_dummy_role(), called immediately after routing. At that earlier point, the inputs are still RequestQueueItem wrappers.

The move left the parameter type as List[LlmRequest] and continued reading llm_request_type from each input. The wrappers do not have that field, so the helper misses the request's role. This code later reached main through #15222.

This PR changes the input type to list[RequestQueueItem], reads candidate.request.request_type directly, and updates the tests to use queue-item inputs.

Test Coverage

  • Ran tests/unittest/_torch/executor/test_py_executor.py on ComputeLab: 253 passed, with no skips or errors.
  • The nine ADP role cases use real RequestQueueItem wrappers and cover context/generation roles, role changes, disabled attention DP, non-disaggregated workers, both mixed-role orderings, and empty candidates.
  • Test-file Ruff lint/format, Python AST parsing, and git diff --check passed.

PR Checklist

  • Description explains the behavior and scope.
  • Commits include DCO sign-off.
  • Focused unit tests and static checks passed.
  • Please check this after reviewing the above items as appropriate for this PR.

@dongfengy
dongfengy marked this pull request as ready for review October 15, 2026 16:23
@dongfengy
dongfengy requested review from a team as code owners October 15, 2026 16:23
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coderabbitai Bot commented Oct 15, 2026 •

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Walkthrough

PyExecutor._update_adp_dummy_role now reads public request types from RequestQueueItem requests. Tests cover context-only, generation-only, mixed, and empty queues. The MPI session test adds a worker barrier before updating its shared counter and increases the remote test timeout to 120 seconds.

Changes

Dummy role handling

Layer / File(s) Summary
Queued request type detection
tensorrt_llm/_torch/pyexecutor/py_executor.py, tests/unittest/_torch/executor/test_py_executor.py
_update_adp_dummy_role reads the request type from each queue item's request. Tests cover context and generation selection, mixed queue orderings, and unchanged roles for empty queues.

MPI session synchronization

Layer / File(s) Summary
Worker barrier before counter update
tests/unittest/llmapi/test_mpi_session.py, tests/unittest/llmapi/_test_remote_mpi_session.sh
task0 waits at a COMM_WORLD barrier before updating the shared node-state counter. The remote MPI session test timeout increases from 60 to 120 seconds.

Priority: ➖ Normal

Estimated code review effort: 2 (Simple) | ~8 minutes

Change: Bug fix

Suggested reviewers: juney-nvidia, lori-ren

Merge Risk: ⚪ Minimal · up to e9d3e

No concrete issue remains that would block merging after normal checks. The earlier CI failures still warrant checking their diagnostics, but their cause is not established here.

Pre-merge checks: Passed 4 · Failed 1

Failed Failed checks: 1 warning

Check name Status Explanation Resolution
Docstring Coverage Warning Docstring coverage is 8.33% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 12 functions across 4 files. Write docstrings for the functions missing them to satisfy the coverage threshold.
Passed Passed checks: 4 passed
Check name Status Explanation
Linked Issues check Passed Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check Passed Check skipped because no linked issues were found for this pull request.
Title check Passed The title follows the required [None][fix] format and clearly identifies the attention-DP dummy-role fix.
Description check Passed The description includes the required Description, Test Coverage, and PR Checklist sections. It explains the root cause, implementation, affected tests, and reported validation results.
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Actionable comments posted: 1


  • 🪄 Fix comments: Fix CodeRabbit comments on this PR
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Inline comments:
Review comments at @tensorrt_llm/_torch/pyexecutor/py_executor.py:
- Around line 7602-7618: Add regression tests for `_update_adp_dummy_role` using
`RequestQueueItem` instances whose requests set `request_type`: verify queued
context-only requests select context, queued generation-only requests select
generation, and context takes precedence in a mixed batch. Ensure the tests fail
if queue-item unwrapping or either `request_type` check is removed.

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Comment thread tensorrt_llm/_torch/pyexecutor/py_executor.py Outdated

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PR_Github #78218 [ run ] completed with state FAILURE. Commit: 2e9c70c
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PR_Github #78263 [ run ] completed with state FAILURE. Commit: 7c81c20
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LGTM. Thanks!

@dongfengy
dongfengy force-pushed the codex/glm-upstream-p01-adp-role-20261014 branch from 4170d94 to 3f0f371 Compare October 17, 2026 21:45

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PR_Github #78671 [ run ] triggered by Bot. Commit: 3f0f371 Link to invocation

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PR_Github #78671 [ run ] completed with state FAILURE. Commit: 3f0f371
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Signed-off-by: Dongfeng Yu <dongfengy@nvidia.com>
Signed-off-by: Dongfeng Yu <dongfengy@nvidia.com>
Signed-off-by: Dongfeng Yu <dongfengy@nvidia.com>
Signed-off-by: Dongfeng Yu <dongfengy@nvidia.com>
The remote MPI test's 60-second deadline covers worker startup, task execution,
and launcher shutdown. Previous ARM passes took up to 57.7 seconds, and three
failing cases completed their client task before the overall deadline expired.

Increase the bounded test deadline to 120 seconds while retaining all assertions,
exit-code checks, and failure reporting.

Signed-off-by: Dongfeng Yu <dongfengy@nvidia.com>
Revert the worker barrier from d952647 and the remote MPI timeout change
from e9d3e47. These tests do not exercise the ADP request-type fix and
their failures are outside this PR's scope.

Retain the ADP type/role fix and its targeted regression coverage.

Signed-off-by: Dongfeng Yu <dongfengy@nvidia.com>
@dongfengy
dongfengy force-pushed the codex/glm-upstream-p01-adp-role-20261014 branch from 3f0f371 to e17ee10 Compare October 18, 2026 02:56

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PR_Github #78682 [ run ] triggered by Bot. Commit: e17ee10 Link to invocation

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PR_Github #78682 [ run ] completed with state FAILURE. Commit: e17ee10
/LLM/main/L0_MergeRequest_PR pipeline #64829 completed with status: 'FAILURE'

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