[jira] [Commented] (BEAM-8804) PCollectionList support in cross-language transforms

["Beam JIRA Bot (Jira)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/BEAM-8804?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17174589#comment-17174589 ] 

Beam JIRA Bot commented on BEAM-8804:
-------------------------------------

This issue is P2 but has been unassigned without any comment for 60 days so it has been labeled "stale-P2". If this issue is still affecting you, we care! Please comment and remove the label. Otherwise, in 14 days the issue will be moved to P3.

Please see https://beam.apache.org/contribute/jira-priorities/ for a detailed explanation of what these priorities mean.


> PCollectionList support in cross-language transforms
> ----------------------------------------------------
>
>                 Key: BEAM-8804
>                 URL: https://issues.apache.org/jira/browse/BEAM-8804
>             Project: Beam
>          Issue Type: Improvement
>          Components: beam-model
>            Reporter: Heejong Lee
>            Priority: P2
>              Labels: stale-P2
>
> Currently, Beam model doesn't have any information on the order of input/output PCollections from PTransforms. Therefore, PCollectionList needs to be converted to PCollectionTuple when it goes across the cross-language boundaries (or even in the same language, whenever it is converted between in-memory object and proto) and it's impossible to recreate PCollectionList from proto with the original order. The possible workaround is just to use PCollectionTuple with integer id (starting from 0 like indexes) instead of PCollectionList. In that case, we should first well-define how we generate proto from PCollectionList since each SDK uses a different convention.



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