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https://issues.apache.org/jira/browse/BEAM-9505?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17084779#comment-17084779
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Niel Markwick commented on BEAM-9505:
-------------------------------------
The shame 😢. This is actually a bug in my code where a value was not cleared in
FinishBundle, leading to an unexpected state in StartBundle and a spurious
error message.
This only occurs in certain situations (such as an empty bundle, which can
occur in streaming if the window is also empty).
Updating issue to correct.
> DoFn.StartBundle called multiple times when streaming
> -----------------------------------------------------
>
> Key: BEAM-9505
> URL: https://issues.apache.org/jira/browse/BEAM-9505
> Project: Beam
> Issue Type: Bug
> Components: runner-dataflow
> Affects Versions: 2.18.0, 2.19.0
> Reporter: Niel Markwick
> Assignee: Boyuan Zhang
> Priority: Major
>
> When using DataflowRunner in streaming mode. DoFn.StartBundle is called
> multiple times for the same bundle.
>
> This does not occur with DirectRunner.
> This breaks DoFn's which require per-bundle setup and teardown procedures.
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