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https://issues.apache.org/jira/browse/BEAM-3297?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16320918#comment-16320918
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Luke Cwik commented on BEAM-3297:
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If a runner harness asks you to execute a bundle, you should always go through
the start bundle/finish bundle even if the runner sends the SDK zero elements.
This is important because people write functions that take zero inputs and
produce one or more outputs.
> StartBundle/FinishBundle should be called only if there are elements
> ---------------------------------------------------------------------
>
> Key: BEAM-3297
> URL: https://issues.apache.org/jira/browse/BEAM-3297
> Project: Beam
> Issue Type: Bug
> Components: sdk-go
> Reporter: Henning Rohde
> Priority: Minor
> Fix For: Not applicable
>
>
> I believe the semantics is lazy. Exec currently calls SB/FB eagerly
> irrespectively of whether any elements are emitted.
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