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Posted to issues@beam.apache.org by "ASF GitHub Bot (Jira)" <ji...@apache.org> on 2021/10/11 18:39:00 UTC
[jira] [Work logged] (BEAM-12960) Error unclear for structural DoFn
[ https://issues.apache.org/jira/browse/BEAM-12960?focusedWorklogId=663707&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-663707 ]
ASF GitHub Bot logged work on BEAM-12960:
-----------------------------------------
Author: ASF GitHub Bot
Created on: 11/Oct/21 18:38
Start Date: 11/Oct/21 18:38
Worklog Time Spent: 10m
Work Description: jrmccluskey opened a new pull request #15703:
URL: https://github.com/apache/beam/pull/15703
Clarifies the error in a failure case where the ProcessElement method cannot be called from a structural DoFn.
------------------------
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`ValidatesRunner` compliance status (on master branch)
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Examples testing status on various runners
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Issue Time Tracking
-------------------
Worklog Id: (was: 663707)
Remaining Estimate: 0h
Time Spent: 10m
> 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
> Time Spent: 10m
> Remaining Estimate: 0h
>
> 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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