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ASF GitHub Bot logged work on BEAM-7678: ---------------------------------------- Author: ASF GitHub Bot Created on: 03/Aug/19 00:21 Start Date: 03/Aug/19 00:21 Worklog Time Spent: 10m Work Description: ecanzonieri commented on pull request #9238: [BEAM-7678] Fixes bug in output element_type generation in Kv PipelineVisitor URL: https://github.com/apache/beam/pull/9238 This review tries to address BEAM-7678. When we use typehints in the output the `element_type` is already defined so in theory there is no need to try to infer it. There are some types that cannot be inferred by the function `infer_output_type`, in these cases the typehint should be used to bypass the inferred type. I'm not sure how to test this code, I can reproduce the issue in a manual test, using as type a class that for some reason the `infer_output_type` is not able to infer. ------------------------ Thank you for your contribution! 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To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. For queries about this service, please contact Infrastructure at: us...@infra.apache.org Issue Time Tracking ------------------- Worklog Id: (was: 288339) Time Spent: 10m Remaining Estimate: 0h > typehints with_output_types annotation doesn't work for stateful DoFn > ---------------------------------------------------------------------- > > Key: BEAM-7678 > URL: https://issues.apache.org/jira/browse/BEAM-7678 > Project: Beam > Issue Type: Bug > Components: sdk-py-core > Affects Versions: 2.13.0 > Reporter: Enrico Canzonieri > Priority: Minor > Time Spent: 10m > Remaining Estimate: 0h > > The output types typehints seem to be ignored when using a stateful DoFn, but > the same typehint works perfectly when used without state. This issue > prevents a custom Coder from being used because Beam will default to one of > theĀ {{FastCoders}} (I believe Pickle). > Example code: > {code} > @typehints.with_output_types(Message) > class StatefulDoFn(DoFn): > COUNTER_STATE = BagStateSpec('counter', VarIntCoder()) > def process(self, element, counter=DoFn.StateParam(COUNTER_STATE)): > (key, messages) = element > newMessage = Message() > return [newMessage] > {code} > The example code is just defining a stateful DoFn for python. The used runner > is the Flink 1.6.4 portable runner. > Finally, overriding {{infer_output_type}} to return a > {{typehints.List[Message]}} solves the issue. > Looking at the code, it seems to me that in > [https://github.com/apache/beam/blob/v2.13.0/sdks/python/apache_beam/pipeline.py#L643] > we do not take the typehints into account. -- This message was sent by Atlassian JIRA (v7.6.14#76016)