Christophe Rodriguez created BEAM-12586:
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Summary: Python Direct Runner doesn't support both streaming & non
streaming sources
Key: BEAM-12586
URL: https://issues.apache.org/jira/browse/BEAM-12586
Project: Beam
Issue Type: Bug
Components: runner-direct
Affects Versions: 2.30.0
Reporter: Christophe Rodriguez
Please see Stack Overflow discussion:
[https://stackoverflow.com/questions/68125864/transform-node-appliedptransform-was-not-replaced-as-expected-error-with-the-dir]
When I create a GCS source & a Pub Source and try to flatten both, there is an
error because of some incompatible transformation done by the direct runner.
Code example:
{code:java}
gcsEventsColl = p | "Read from GCS" >>
beam.io.ReadFromText("gs://sample_events_for_beam/*.log") \
| 'convert to dict' >> beam.Map(lambda x: json.loads(x))
liveEventsColl = p | "Read from Pubsub" >>
beam.io.ReadFromPubSub(topic="projects/axxxx/topics/input_topic") \
| 'convert to dict2' >> beam.Map(lambda x: json.loads(x))
input_rec = (gcsEventsColl, liveEventsColl) | 'flatten' >> beam.Flatten()
{code}
Error:
{code:java}
File
"/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages/apache_beam/pipeline.py",
line 564, in run
return self.runner.run_pipeline(self, self._options)
File
"/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages/apache_beam/runners/direct/direct_runner.py",
line 131, in run_pipeline
return runner.run_pipeline(pipeline, options)
File
"/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages/apache_beam/runners/direct/direct_runner.py",
line 529, in run_pipeline
pipeline.replace_all(_get_transform_overrides(options))
File
"/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages/apache_beam/pipeline.py",
line 504, in replace_all
self._check_replacement(override)
File
"/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages/apache_beam/pipeline.py",
line 478, in _check_replacement
self.visit(ReplacementValidator())
File
"/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages/apache_beam/pipeline.py",
line 611, in visit
self._root_transform().visit(visitor, self, visited)
File
"/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages/apache_beam/pipeline.py",
line 1195, in visit
part.visit(visitor, pipeline, visited)
File
"/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages/apache_beam/pipeline.py",
line 1195, in visit
part.visit(visitor, pipeline, visited)
File
"/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages/apache_beam/pipeline.py",
line 1195, in visit
part.visit(visitor, pipeline, visited) [Previous line repeated 4 more
times]
File
"/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages/apache_beam/pipeline.py",
line 1198, in visit
visitor.visit_transform(self)
File
"/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages/apache_beam/pipeline.py",
line 476, in visit_transform
transform_node) RuntimeError: Transform node AppliedPTransform(Read from
GCS/Read/SDFBoundedSourceReader/ParDo(SDFBoundedSourceDoFn)/ProcessKeyedElements/GroupByKey/GroupByKey,
_GroupByKeyOnly) was not replaced as expected.
{code}
The direct runner corrupts the pipeline when it rewrites the transforms.
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