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https://issues.apache.org/jira/browse/BEAM-6473?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16751075#comment-16751075
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Robert Bradshaw commented on BEAM-6473:
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Yes, I think this is an error in the Java fuser, as the initial graph is valid.
My guess is it thinks it can drop the production of the flatten output due to
it being used in the side input, but this is incorrect as it's used elsewhere.
> Python Flink ValidatesRunner test_flattened_side_input fails
> ------------------------------------------------------------
>
> Key: BEAM-6473
> URL: https://issues.apache.org/jira/browse/BEAM-6473
> Project: Beam
> Issue Type: Test
> Components: runner-flink, sdk-py-core
> Reporter: Maximilian Michels
> Priority: Major
> Time Spent: 50m
> Remaining Estimate: 0h
>
> The {{test_flattened_side_input}} test fails after merging
> [https://github.com/apache/beam/pull/7456]
> {noformat}
> ERROR: test_flattened_side_input (_main_.FlinkRunnerTest)
> ----------------------------------------------------------------------
> Traceback (most recent call last)
> File "apache_beam/runners/portability/fn_api_runner_test.py", line 205, in
> test_flattened_side_input
> label='CheckFlattenOfSideInput')
> File "apache_beam/pipeline.py", line 425, in _exit_
> self.run().wait_until_finish()
> File "apache_beam/runners/portability/portable_runner.py", line 349, in
> wait_until_finish
> self._job_id, self._state, self._last_error_message()))
> RuntimeError: Pipeline
> test_flattened_side_input_1547859357.36_07dcde9b-acfc-4e8d-b930-582f7637a07e
> failed in state FAILED: java.lang.IllegalArgumentException: PCollectionNodes
> [PCollectionNode
> {id=ref_PCollection_PCollection_12, PCollection=unique_name:
> "17side3/Map(decode).None" coder_id: "ref_Coder_BytesCoder_1" is_bounded:
> BOUNDED windowing_strategy_id: "ref_Windowing_Windowing_1" }
> ] were consumed but never produced
> {noformat}
> [https://builds.apache.org/job/beam_PostCommit_Python_VR_Flink_PR/134/console]
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