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Posted to issues@beam.apache.org by "Jack McCluskey (Jira)" <ji...@apache.org> on 2021/10/11 16:00:06 UTC

[jira] [Assigned] (BEAM-12960) Error unclear for structural DoFn

     [ https://issues.apache.org/jira/browse/BEAM-12960?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Jack McCluskey reassigned BEAM-12960:
-------------------------------------

    Assignee: Jack McCluskey

> Error unclear for structural DoFn
> ---------------------------------
>
>                 Key: BEAM-12960
>                 URL: https://issues.apache.org/jira/browse/BEAM-12960
>             Project: Beam
>          Issue Type: Bug
>          Components: sdk-go
>            Reporter: Andrew Haselgrove
>            Assignee: Jack McCluskey
>            Priority: P2
>
> I recently received the following error for my structural DoFn: "failed to find ProcessElement method". However, I had implemented ProcessElement - the error was that I failed to take the address of the DoFn struct as the parameter for the ParDo.
> I think this error could be much clearer. Taking a look at the implementation, I see that it somewhat is: [https://github.com/apache/beam/blob/master/sdks/go/pkg/beam/core/graph/fn.go#L154.] However, this error message doesn't match the implementation, which also accepts the struct as-is. I assume the struct is accepted here for other uses of `NewFn` (eg. `RegisterFunction`), as from my example above, for the `ParDo` case, this just goes on to surface a less-clear error deeper in the call chain.



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