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[BugFix] [P/D] Handle lookahead token count edge-case with Eagle Spec Decoding and P/D (#22317)

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Signed-off-by: Pradyun Ramadorai <pradyunr@amazon.com>
Signed-off-by: Pradyun92 <142861237+Pradyun92@users.noreply.github.com>
Co-authored-by: Pradyun Ramadorai <pradyunr@amazon.com>
Co-authored-by: Nicolò Lucchesi <nicolo.lucchesi@gmail.com>
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Pradyun92 2025-08-08 20:04:15 -04:00 committed by GitHub
parent 81c57f60a2
commit 35afe1b30b
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1 changed files with 11 additions and 1 deletions
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12
vllm/v1/core/sched/scheduler.py
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@ -437,14 +437,24 @@ class Scheduler(SchedulerInterface):
# The request cannot be scheduled.
break
# Handles an edge case when P/D Disaggregation
# is used with Spec Decoding where an
# extra block gets allocated which
# creates a mismatch between the number
# of local and remote blocks.
effective_lookahead_tokens = (0 if request.num_computed_tokens
== 0 else
self.num_lookahead_tokens)
new_blocks = self.kv_cache_manager.allocate_slots(
request,
num_new_tokens + num_external_computed_tokens,
num_new_local_computed_tokens,
new_computed_blocks,
num_lookahead_tokens=self.num_lookahead_tokens,
num_lookahead_tokens=effective_lookahead_tokens,
delay_cache_blocks=load_kv_async,
)
if new_blocks is None:
# The request cannot be scheduled.
break