Add same_family_bias model argument for Cassandra#207
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homatthew wants to merge 2 commits intoNetflix-Skunkworks:mainfrom
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Add same_family_bias model argument for Cassandra#207homatthew wants to merge 2 commits intoNetflix-Skunkworks:mainfrom
homatthew wants to merge 2 commits intoNetflix-Skunkworks:mainfrom
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These tests define the interface for a new `family_bias` argument that will allow tuning the least-regret selection to prefer certain instance families. Tests cover: - Argument acceptance in NflxCassandraArguments - Default value behavior - Selection bias toward preferred families - Penalty behavior to avoid certain families - Regret calculation mechanics The tests currently fail with: AttributeError: 'NflxCassandraArguments' object has no attribute 'family_bias' Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
Adds a new `same_family_bias` parameter to `NflxCassandraArguments` that
penalizes switching to a different instance family during capacity planning.
When `same_family_bias` is set and `desires.current_clusters` is provided:
- Plans that keep the same instance family as the current cluster
are sorted by their actual cost
- Plans that switch to a different family have their effective cost
multiplied by `same_family_bias` for sorting purposes
This helps maintain operational stability by preferring to stay on
familiar instance families when the cost difference is small.
Example usage:
extra_model_arguments={"same_family_bias": 2.0}
# Plans switching families appear as 2x more expensive during sorting
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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Summary
Adds a new
same_family_biasparameter toNflxCassandraArgumentsthat penalizes switching to a different instance family during capacity planning.Key changes:
same_family_bias: Optional[float]field toNflxCassandraArguments_plan_certain()in capacity_planner.py to apply bias during sortingBehavior
When
same_family_biasis set anddesires.current_clustersis provided:same_family_biasfor sorting purposesThis helps maintain operational stability by preferring to stay on familiar instance families when the cost difference is small.
Example Usage
Test plan
🤖 Generated with Claude Code