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Posted to commits@beam.apache.org by "Luke Cwik (JIRA)" <ji...@apache.org> on 2018/01/10 19:23:03 UTC

[jira] [Commented] (BEAM-3297) StartBundle/FinishBundle should be called only if there are elements

    [ https://issues.apache.org/jira/browse/BEAM-3297?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16320918#comment-16320918 ] 

Luke Cwik commented on BEAM-3297:
---------------------------------

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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