[jira] [Commented] (BEAM-12586) Python Direct Runner doesn't support both streaming & non streaming sources

["Kenneth Knowles (Jira)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/BEAM-12586?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17377539#comment-17377539 ] 

Kenneth Knowles commented on BEAM-12586:
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Pinging [~pabloem] and [~robertwb] either of whom may know something about the Python direct runner and this situation. Seems like a transform replacement corrupts the graph?

> 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
>            Priority: P2
>
> 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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