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[V0 Deprecation] Remove AsyncLLMEngine#25025

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WoosukKwon merged 25 commits intomainfrom
woosuk/remove-async-llm-engine
Sep 18, 2025
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[V0 Deprecation] Remove AsyncLLMEngine#25025
WoosukKwon merged 25 commits intomainfrom
woosuk/remove-async-llm-engine

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Signed-off-by: Woosuk Kwon <woosuk@thinkingmachines.ai>
@WoosukKwon WoosukKwon added the ready ONLY add when PR is ready to merge/full CI is needed label Sep 17, 2025
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Code Review

This pull request effectively removes the deprecated V0 AsyncLLMEngine and its related components, which is a great cleanup. The changes are mostly straightforward removals of files and code blocks. However, I've identified a critical issue in vllm/entrypoints/openai/api_server.py where the removal of the V0 engine fallback path now leads to an unhelpful AssertionError if a configuration unsupported by the V1 engine is used. My review includes a suggestion to replace this with a more informative error to improve user experience.

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mergify bot commented Sep 17, 2025

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

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

@mergify mergify bot added the needs-rebase label Sep 17, 2025
Signed-off-by: Woosuk Kwon <woosuk.kwon@berkeley.edu>
@mergify mergify bot removed the needs-rebase label Sep 17, 2025
Signed-off-by: Woosuk Kwon <woosuk.kwon@berkeley.edu>
Signed-off-by: Woosuk Kwon <woosuk.kwon@berkeley.edu>
Signed-off-by: Woosuk Kwon <woosuk.kwon@berkeley.edu>
Signed-off-by: Woosuk Kwon <woosuk.kwon@berkeley.edu>
Signed-off-by: Woosuk Kwon <woosuk.kwon@berkeley.edu>
Signed-off-by: Woosuk Kwon <woosuk.kwon@berkeley.edu>
Signed-off-by: Woosuk Kwon <woosuk.kwon@berkeley.edu>
Signed-off-by: Woosuk Kwon <woosuk.kwon@berkeley.edu>
Signed-off-by: Woosuk Kwon <woosuk.kwon@berkeley.edu>
Signed-off-by: Woosuk Kwon <woosuk.kwon@berkeley.edu>
Signed-off-by: Woosuk Kwon <woosuk.kwon@berkeley.edu>
Signed-off-by: Woosuk Kwon <woosuk.kwon@berkeley.edu>
Signed-off-by: Woosuk Kwon <woosuk.kwon@berkeley.edu>
Signed-off-by: Woosuk Kwon <woosuk.kwon@berkeley.edu>
Signed-off-by: Woosuk Kwon <woosuk.kwon@berkeley.edu>
Signed-off-by: Woosuk Kwon <woosuk.kwon@berkeley.edu>
Signed-off-by: Woosuk Kwon <woosuk.kwon@berkeley.edu>
@cadedaniel
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Is there a migration guide for existing code which uses the AsyncLLMEngine with V1 enabled?

@WoosukKwon
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@cadedaniel Please correct me if I'm wrong, but no action should be needed because

from vllm import AsyncLLMEngine
e = AsyncLLMEngine.from_engine_args(...)

will just work (and create a V1 engine).

@WoosukKwon WoosukKwon merged commit e19bce4 into main Sep 18, 2025
47 of 49 checks passed
@WoosukKwon WoosukKwon deleted the woosuk/remove-async-llm-engine branch September 18, 2025 18:07
debroy-rh pushed a commit to debroy-rh/vllm that referenced this pull request Sep 19, 2025
Signed-off-by: Woosuk Kwon <woosuk@thinkingmachines.ai>
Signed-off-by: Woosuk Kwon <woosuk.kwon@berkeley.edu>
FeiDaLI pushed a commit to FeiDaLI/vllm that referenced this pull request Sep 25, 2025
Signed-off-by: Woosuk Kwon <woosuk@thinkingmachines.ai>
Signed-off-by: Woosuk Kwon <woosuk.kwon@berkeley.edu>
charlifu pushed a commit to ROCm/vllm that referenced this pull request Sep 25, 2025
Signed-off-by: Woosuk Kwon <woosuk@thinkingmachines.ai>
Signed-off-by: Woosuk Kwon <woosuk.kwon@berkeley.edu>
Signed-off-by: charlifu <charlifu@amd.com>
choprahetarth pushed a commit to Tandemn-Labs/vllm that referenced this pull request Oct 11, 2025
Signed-off-by: Woosuk Kwon <woosuk@thinkingmachines.ai>
Signed-off-by: Woosuk Kwon <woosuk.kwon@berkeley.edu>
lywa1998 pushed a commit to lywa1998/vllm that referenced this pull request Oct 20, 2025
Signed-off-by: Woosuk Kwon <woosuk@thinkingmachines.ai>
Signed-off-by: Woosuk Kwon <woosuk.kwon@berkeley.edu>
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