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Fix zero scaled services assigned to wrong fleets #3939

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Merged
r4victor merged 1 commit into from
Jun 8, 2026
+7 −1
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Fix zero scaled services assigned to wrong fleets #3939

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8 changes: 7 additions & 1 deletion src/dstack/_internal/server/services/runs/plan.py
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Original file line number Diff line number Diff line change
Expand Up @@ -378,7 +378,13 @@ async def find_optimal_fleet_with_offers(
min_instance_offer_price=_get_min_instance_or_backend_offer_price(
available_instance_offers
),
has_pool_capacity=nodes_required_num <= len(available_instance_offers),
# Require at least one available instance so that fleets without matching
# instances are not treated as having capacity when nodes_required_num is 0
# (e.g. a service scaling from zero replicas).
has_pool_capacity=(
len(available_instance_offers) > 0
and nodes_required_num <= len(available_instance_offers)
),
)
)

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