ffernandez92 opened a new issue, #30446:
URL: https://github.com/apache/beam/issues/30446
### What happened?
I attempted to write some events to PubSub using Beam YAML, and I
encountered the following issue:
```
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File
"/usr/local/lib/python3.11/site-packages/apache_beam/yaml/yaml_transform.py",
line 96, in wrapper
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self._cache[key] = func(self, *args)
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^^^^^^^^^^^^^^^^^
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File
"/usr/local/lib/python3.11/site-packages/apache_beam/yaml/yaml_transform.py",
line 283, in compute_outputs
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return expand_transform(self._transforms_by_uuid[transform_id], self)
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^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
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File
"/usr/local/lib/python3.11/site-packages/apache_beam/yaml/yaml_transform.py",
line 457, in expand_transform
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return expand_leaf_transform(spec, scope)
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^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
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File
"/usr/local/lib/python3.11/site-packages/apache_beam/yaml/yaml_transform.py",
line 497, in expand_leaf_transform
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raise ValueError(
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ValueError: Transform "WriteToPubSub" at line 9 returned an unexpected type
<class 'apache_beam.pvalue.PDone'>
```
I utilized the latest Flex template from Google templates (Dataflow runner).
To simplify the setup and isolate any potential external factors affecting the
overall behavior, I modified my YAML file to its simplest form. Below is the
YAML configuration I ultimately used to reproduce the error:
```
pipeline:
type: chain
transforms:
- type: ReadFromPubSub
config:
topic: <TOPIC_READ>
format: json
schema: <EVENT_SCHEMA>
- type: WriteToPubSub
config:
topic: <TOPIC_WRITE>
format: json
```
My assumption is that WriteToPubSub returns a PDone and it should be
returning a PTransform. I managed to workaround the situation adding this to
the YAML config:
```
pipeline:
transforms:
- type: ReadFromPubSub
config:
topic: <TOPIC_READ>
format: json
schema: <EVENT_SCHEMA>
- type: WindowInto
input: ReadFromPubSub
windowing:
type: fixed
size: 60s
- type: WriteToPubSub
input: WindowInto
config:
topic: <TOPIC_WRITE>
format: json
error_handling:
output: my_error_output
- type: WriteToJson
name: WriteErrorsToJson
input: WriteToPubSub.my_error_output
config:
path: /path/to/errors.json
```
However, I think it's still necessary to fix this issue since error_handling
is optional.
### Issue Priority
Priority: 3 (minor)
### Issue Components
- [ ] Component: Python SDK
- [ ] Component: Java SDK
- [ ] Component: Go SDK
- [ ] Component: Typescript SDK
- [ ] Component: IO connector
- [X] Component: Beam YAML
- [ ] Component: Beam examples
- [ ] Component: Beam playground
- [ ] Component: Beam katas
- [ ] Component: Website
- [ ] Component: Spark Runner
- [ ] Component: Flink Runner
- [ ] Component: Samza Runner
- [ ] Component: Twister2 Runner
- [ ] Component: Hazelcast Jet Runner
- [ ] Component: Google Cloud Dataflow Runner
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