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Filter parent materialized partitions before iterating over them during asset backfill BFS #27909

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15 changes: 14 additions & 1 deletion python_modules/dagster/dagster/_core/execution/asset_backfill.py
Original file line number Diff line number Diff line change
Expand Up @@ -1505,10 +1505,23 @@ def execute_asset_backfill_iteration_inner(
for asset_key in asset_backfill_data.target_subset.asset_keys
)
)
candidate_asset_graph_subset = AssetGraphSubset.from_asset_partition_set(

parent_materialized_asset_graph_subset = AssetGraphSubset.from_asset_partition_set(
parent_materialized_asset_partitions, asset_graph
)

# Filter out parent materializations for partitions outside the range
# that existed when the backfill was created
full_subsets = [
asset_graph_view.get_full_subset(key=asset_key)
for asset_key in parent_materialized_asset_graph_subset.asset_keys
]

candidate_asset_graph_subset = (
parent_materialized_asset_graph_subset
& AssetGraphSubset.from_entity_subsets(full_subsets)
)

yield None

failed_and_downstream_subset = _get_failed_and_downstream_asset_graph_subset(
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