lukecwik commented on code in PR #25394:
URL: https://github.com/apache/beam/pull/25394#discussion_r1101779443
##########
sdks/python/apache_beam/runners/common.py:
##########
@@ -1852,3 +1853,46 @@ def visit_transform(self, transform_node):
self.deterministic_key_coders and transform_node.full_label)
return GroupByKeyInputVisitor(deterministic_key_coders)
+
+
+def validate_pipeline_graph(pipeline_proto):
+ """Ensures this is a correctly constructed Beam pipeline.
+ """
+ def get_coder(pcoll_id):
+ return pipeline_proto.components.coders[
+ pipeline_proto.components.pcollections[pcoll_id].coder_id]
+
+ def validate_transform(transform_id):
+ transform_proto = pipeline_proto.components.transforms[transform_id]
+
+ # Currently the only validation we perform is that GBK operations have
+ # their coders set properly.
+ if transform_proto.spec.urn == common_urns.primitives.GROUP_BY_KEY.urn:
+ if len(transform_proto.inputs) != 1:
+ raise ValueError("Unexpected number of inputs: %s" % transform_proto)
+ if len(transform_proto.outputs) != 1:
+ raise ValueError("Unexpected number of outputs: %s" % transform_proto)
+ input_coder = get_coder(next(iter(transform_proto.inputs.values())))
+ output_coder = get_coder(next(iter(transform_proto.outputs.values())))
+ if input_coder.spec.urn != common_urns.coders.KV.urn:
+ raise ValueError(
+ "Bad coder for input of %s: %s" % (transform_id, input_coder))
+ if output_coder.spec.urn != common_urns.coders.KV.urn:
+ raise ValueError(
+ "Bad coder for output of %s: %s" % (transform_id, input_coder))
+ output_values_coder = pipeline_proto.components.coders[
+ output_coder.component_coder_ids[1]]
+ if (input_coder.component_coder_ids[0] !=
+ output_coder.component_coder_ids[0] or
+ output_values_coder.spec.urn != common_urns.coders.ITERABLE.urn or
+ output_values_coder.component_coder_ids[0] !=
+ input_coder.component_coder_ids[1]):
+ raise ValueError(
+ "Incompatable input and output coders for %s: %s" %
Review Comment:
Fix typo in string substitution to get tests past trivial issue
```suggestion
"Incompatible input coder %s and output coder %s for transform
%s" %
```
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