AssetSpec.partitions_def

Author: sryza

python_modules/dagster/dagster/_core/definitions/asset_graph.py

@@ -89,11 +89,11 @@ def owners(self) -> Sequence[str]:
 
     @property
     def is_partitioned(self) -> bool:
-        return self.assets_def.partitions_def is not None
+        return self.partitions_def is not None
 
     @property
     def partitions_def(self) -> Optional[PartitionsDefinition]:
-        return self.assets_def.partitions_def
+        return self.assets_def.specs_by_key[self.key].partitions_def
 
     @property
     def partition_mappings(self) -> Mapping[AssetKey, PartitionMapping]:

python_modules/dagster/dagster/_core/definitions/asset_out.py

@@ -17,6 +17,7 @@
 from dagster._core.definitions.freshness_policy import FreshnessPolicy
 from dagster._core.definitions.input import NoValueSentinel
 from dagster._core.definitions.output import Out
+from dagster._core.definitions.partition import PartitionsDefinition
 from dagster._core.definitions.utils import (
     DEFAULT_IO_MANAGER_KEY,
     resolve_automation_condition,
@@ -148,7 +149,12 @@ def to_out(self) -> Out:
             code_version=self.code_version,
         )
 
-    def to_spec(self, key: AssetKey, deps: Sequence[AssetDep]) -> AssetSpec:
+    def to_spec(
+        self,
+        key: AssetKey,
+        deps: Sequence[AssetDep],
+        partitions_def: Optional[PartitionsDefinition],
+    ) -> AssetSpec:
         with disable_dagster_warnings():
             return AssetSpec.dagster_internal_init(
                 key=key,
@@ -163,7 +169,7 @@ def to_spec(self, key: AssetKey, deps: Sequence[AssetDep]) -> AssetSpec:
                 tags=self.tags,
                 deps=deps,
                 auto_materialize_policy=None,
-                partitions_def=None,
+                partitions_def=partitions_def,
             )
 
     @property

python_modules/dagster/dagster/_core/definitions/assets.py

@@ -36,7 +36,7 @@
     AssetSpec,
 )
 from dagster._core.definitions.auto_materialize_policy import AutoMaterializePolicy
-from dagster._core.definitions.backfill_policy import BackfillPolicy, BackfillPolicyType
+from dagster._core.definitions.backfill_policy import BackfillPolicy
 from dagster._core.definitions.declarative_automation.automation_condition import (
     AutomationCondition,
 )
@@ -103,9 +103,9 @@ class AssetsDefinition(ResourceAddable, IHasInternalInit):
         "descriptions_by_key",
         "asset_deps",
         "owners_by_key",
+        "partitions_def",
     }
 
-    _partitions_def: Optional[PartitionsDefinition]
     # partition mappings are also tracked inside the AssetSpecs, but this enables faster access by
     # upstream asset key
     _partition_mappings: Mapping[AssetKey, PartitionMapping]
@@ -227,24 +227,10 @@ def __init__(
                 execution_type=execution_type or AssetExecutionType.MATERIALIZATION,
             )
 
-        self._partitions_def = _resolve_partitions_def(specs, partitions_def)
-
         self._resource_defs = wrap_resources_for_execution(
             check.opt_mapping_param(resource_defs, "resource_defs")
         )
 
-        if self._partitions_def is None:
-            # check if backfill policy is BackfillPolicyType.SINGLE_RUN if asset is not partitioned
-            check.param_invariant(
-                (
-                    backfill_policy.policy_type is BackfillPolicyType.SINGLE_RUN
-                    if backfill_policy
-                    else True
-                ),
-                "backfill_policy",
-                "Non partitioned asset can only have single run backfill policy",
-            )
-
         if specs is not None:
             check.invariant(group_names_by_key is None)
             check.invariant(metadata_by_key is None)
@@ -256,6 +242,7 @@ def __init__(
             check.invariant(owners_by_key is None)
             check.invariant(partition_mappings is None)
             check.invariant(asset_deps is None)
+            check.invariant(partitions_def is None)
             resolved_specs = specs
 
         else:
@@ -295,6 +282,7 @@ def __init__(
                 metadata_by_key=metadata_by_key,
                 descriptions_by_key=descriptions_by_key,
                 code_versions_by_key=None,
+                partitions_def=partitions_def,
             )
 
         normalized_specs: List[AssetSpec] = []
@@ -331,11 +319,11 @@ def __init__(
             check.invariant(
                 not (
                     spec.freshness_policy
-                    and self._partitions_def is not None
-                    and not isinstance(self._partitions_def, TimeWindowPartitionsDefinition)
+                    and spec.partitions_def is not None
+                    and not isinstance(spec.partitions_def, TimeWindowPartitionsDefinition)
                 ),
                 "FreshnessPolicies are currently unsupported for assets with partitions of type"
-                f" {type(self._partitions_def)}.",
+                f" {spec.partitions_def}.",
             )
 
             normalized_specs.append(
@@ -345,10 +333,19 @@ def __init__(
                     metadata=metadata,
                     description=description,
                     skippable=skippable,
-                    partitions_def=self._partitions_def,
                 )
             )
 
+        unique_partitions_defs = {
+            spec.partitions_def for spec in normalized_specs if spec.partitions_def is not None
+        }
+        if len(unique_partitions_defs) > 1 and not can_subset:
+            raise DagsterInvalidDefinitionError(
+                "If different AssetSpecs have different partitions_defs, can_subset must be True"
+            )
+
+        _validate_self_deps(normalized_specs)
+
         self._specs_by_key = {spec.key: spec for spec in normalized_specs}
 
         self._partition_mappings = get_partition_mappings_from_deps(
@@ -361,27 +358,11 @@ def __init__(
             spec.key: spec for spec in self._check_specs_by_output_name.values()
         }
 
-        if self._computation:
-            _validate_self_deps(
-                input_keys=[
-                    key
-                    # filter out the special inputs which are used for cases when a multi-asset is
-                    # subsetted, as these are not the same as self-dependencies and are never loaded
-                    # in the same step that their corresponding output is produced
-                    for input_name, key in self._computation.keys_by_input_name.items()
-                    if not input_name.startswith(ASSET_SUBSET_INPUT_PREFIX)
-                ],
-                output_keys=self._computation.selected_asset_keys,
-                partition_mappings=self._partition_mappings,
-                partitions_def=self._partitions_def,
-            )
-
     def dagster_internal_init(
         *,
         keys_by_input_name: Mapping[str, AssetKey],
         keys_by_output_name: Mapping[str, AssetKey],
         node_def: NodeDefinition,
-        partitions_def: Optional[PartitionsDefinition],
         selected_asset_keys: Optional[AbstractSet[AssetKey]],
         can_subset: bool,
         resource_defs: Optional[Mapping[str, object]],
@@ -398,7 +379,6 @@ def dagster_internal_init(
                 keys_by_input_name=keys_by_input_name,
                 keys_by_output_name=keys_by_output_name,
                 node_def=node_def,
-                partitions_def=partitions_def,
                 selected_asset_keys=selected_asset_keys,
                 can_subset=can_subset,
                 resource_defs=resource_defs,
@@ -769,17 +749,13 @@ def _output_dict_to_asset_dict(
             metadata_by_key=_output_dict_to_asset_dict(metadata_by_output_name),
             descriptions_by_key=_output_dict_to_asset_dict(descriptions_by_output_name),
             code_versions_by_key=_output_dict_to_asset_dict(code_versions_by_output_name),
+            partitions_def=partitions_def,
         )
 
         return AssetsDefinition.dagster_internal_init(
             keys_by_input_name=keys_by_input_name,
             keys_by_output_name=keys_by_output_name_with_prefix,
             node_def=node_def,
-            partitions_def=check.opt_inst_param(
-                partitions_def,
-                "partitions_def",
-                PartitionsDefinition,
-            ),
             resource_defs=resource_defs,
             backfill_policy=check.opt_inst_param(
                 backfill_policy, "backfill_policy", BackfillPolicy
@@ -1038,10 +1014,20 @@ def backfill_policy(self) -> Optional[BackfillPolicy]:
         return self._computation.backfill_policy if self._computation else None
 
     @public
-    @property
+    @cached_property
     def partitions_def(self) -> Optional[PartitionsDefinition]:
         """Optional[PartitionsDefinition]: The PartitionsDefinition for this AssetsDefinition (if any)."""
-        return self._partitions_def
+        partitions_defs = {
+            spec.partitions_def for spec in self.specs if spec.partitions_def is not None
+        }
+        if len(partitions_defs) == 1:
+            return next(iter(partitions_defs))
+        elif len(partitions_defs) == 0:
+            return None
+        else:
+            check.failed(
+                "Different assets within this AssetsDefinition have different PartitionsDefinitions"
+            )
 
     @property
     def metadata_by_key(self) -> Mapping[AssetKey, ArbitraryMetadataMapping]:
@@ -1132,12 +1118,17 @@ def get_partition_mapping_for_dep(self, dep_key: AssetKey) -> Optional[Partition
         return self._partition_mappings.get(dep_key)
 
     def infer_partition_mapping(
-        self, upstream_asset_key: AssetKey, upstream_partitions_def: Optional[PartitionsDefinition]
+        self,
+        asset_key: AssetKey,
+        upstream_asset_key: AssetKey,
+        upstream_partitions_def: Optional[PartitionsDefinition],
     ) -> PartitionMapping:
         with disable_dagster_warnings():
             partition_mapping = self._partition_mappings.get(upstream_asset_key)
             return infer_partition_mapping(
-                partition_mapping, self._partitions_def, upstream_partitions_def
+                partition_mapping,
+                self.specs_by_key[asset_key].partitions_def,
+                upstream_partitions_def,
             )
 
     def get_output_name_for_asset_key(self, key: AssetKey) -> str:
@@ -1396,7 +1387,7 @@ def _output_to_source_asset(self, output_name: str) -> SourceAsset:
                 io_manager_key=output_def.io_manager_key,
                 description=spec.description,
                 resource_defs=self.resource_defs,
-                partitions_def=self.partitions_def,
+                partitions_def=spec.partitions_def,
                 group_name=spec.group_name,
                 tags=spec.tags,
             )
@@ -1495,7 +1486,6 @@ def get_attributes_dict(self) -> Dict[str, Any]:
             keys_by_input_name=self.node_keys_by_input_name,
             keys_by_output_name=self.node_keys_by_output_name,
             node_def=self._computation.node_def if self._computation else None,
-            partitions_def=self._partitions_def,
             selected_asset_keys=self.keys,
             can_subset=self.can_subset,
             resource_defs=self._resource_defs,
@@ -1691,6 +1681,7 @@ def _asset_specs_from_attr_key_params(
     code_versions_by_key: Optional[Mapping[AssetKey, str]],
     descriptions_by_key: Optional[Mapping[AssetKey, str]],
     owners_by_key: Optional[Mapping[AssetKey, Sequence[str]]],
+    partitions_def: Optional[PartitionsDefinition],
 ) -> Sequence[AssetSpec]:
     validated_group_names_by_key = check.opt_mapping_param(
         group_names_by_key, "group_names_by_key", key_type=AssetKey, value_type=str
@@ -1763,40 +1754,36 @@ def _asset_specs_from_attr_key_params(
                     # NodeDefinition
                     skippable=False,
                     auto_materialize_policy=None,
-                    partitions_def=None,
+                    partitions_def=check.opt_inst_param(
+                        partitions_def, "partitions_def", PartitionsDefinition
+                    ),
                 )
             )
 
     return result
 
 
-def _validate_self_deps(
-    input_keys: Iterable[AssetKey],
-    output_keys: Iterable[AssetKey],
-    partition_mappings: Mapping[AssetKey, PartitionMapping],
-    partitions_def: Optional[PartitionsDefinition],
-) -> None:
-    output_keys_set = set(output_keys)
-    for input_key in input_keys:
-        if input_key in output_keys_set:
-            if input_key in partition_mappings:
-                partition_mapping = partition_mappings[input_key]
-                time_window_partition_mapping = get_self_dep_time_window_partition_mapping(
-                    partition_mapping, partitions_def
-                )
-                if (
-                    time_window_partition_mapping is not None
-                    and (time_window_partition_mapping.start_offset or 0) < 0
-                    and (time_window_partition_mapping.end_offset or 0) < 0
-                ):
-                    continue
+def _validate_self_deps(specs: Iterable[AssetSpec]) -> None:
+    for spec in specs:
+        for dep in spec.deps:
+            if dep.asset_key == spec.key:
+                if dep.partition_mapping:
+                    time_window_partition_mapping = get_self_dep_time_window_partition_mapping(
+                        dep.partition_mapping, spec.partitions_def
+                    )
+                    if (
+                        time_window_partition_mapping is not None
+                        and (time_window_partition_mapping.start_offset or 0) < 0
+                        and (time_window_partition_mapping.end_offset or 0) < 0
+                    ):
+                        continue
 
-            raise DagsterInvalidDefinitionError(
-                f'Asset "{input_key.to_user_string()}" depends on itself. Assets can only depend'
-                " on themselves if they are:\n(a) time-partitioned and each partition depends on"
-                " earlier partitions\n(b) multipartitioned, with one time dimension that depends"
-                " on earlier time partitions"
-            )
+                raise DagsterInvalidDefinitionError(
+                    f'Asset "{spec.key.to_user_string()}" depends on itself. Assets can only depend'
+                    " on themselves if they are:\n(a) time-partitioned and each partition depends on"
+                    " earlier partitions\n(b) multipartitioned, with one time dimension that depends"
+                    " on earlier time partitions"
+                )
 
 
 def get_self_dep_time_window_partition_mapping(
@@ -1824,38 +1811,6 @@ def get_self_dep_time_window_partition_mapping(
     return None
 
 
-def _resolve_partitions_def(
-    specs: Optional[Sequence[AssetSpec]], partitions_def: Optional[PartitionsDefinition]
-) -> Optional[PartitionsDefinition]:
-    if specs:
-        asset_keys_by_partitions_def = defaultdict(set)
-        for spec in specs:
-            asset_keys_by_partitions_def[spec.partitions_def].add(spec.key)
-        if len(asset_keys_by_partitions_def) > 1:
-            partition_1_asset_keys, partition_2_asset_keys, *_ = (
-                asset_keys_by_partitions_def.values()
-            )
-            check.failed(
-                f"All AssetSpecs must have the same partitions_def, but "
-                f"{next(iter(partition_1_asset_keys)).to_user_string()} and "
-                f"{next(iter(partition_2_asset_keys)).to_user_string()} have different "
-                "partitions_defs."
-            )
-        common_partitions_def = next(iter(asset_keys_by_partitions_def.keys()))
-        if (
-            common_partitions_def is not None
-            and partitions_def is not None
-            and common_partitions_def != partitions_def
-        ):
-            check.failed(
-                f"AssetSpec for {next(iter(specs)).key.to_user_string()} has partitions_def which is different "
-                "than the partitions_def provided to AssetsDefinition.",
-            )
-        return partitions_def or common_partitions_def
-    else:
-        return partitions_def
-
-
 def get_partition_mappings_from_deps(
     partition_mappings: Dict[AssetKey, PartitionMapping], deps: Iterable[AssetDep], asset_name: str
 ) -> Mapping[AssetKey, PartitionMapping]: