[jira] [Commented] (BEAM-1786) AutoService registration of coders, like we do with PipelineRunners

["Luke Cwik (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/BEAM-1786?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15975814#comment-15975814 ] 

Luke Cwik commented on BEAM-1786:
---------------------------------

This is needed to thin out the Java SDK core BEAM-1871 otherwise we are stuck with coder classes like TableRowJsonCoder.

> AutoService registration of coders, like we do with PipelineRunners
> -------------------------------------------------------------------
>
>                 Key: BEAM-1786
>                 URL: https://issues.apache.org/jira/browse/BEAM-1786
>             Project: Beam
>          Issue Type: Improvement
>          Components: sdk-java-core
>            Reporter: Kenneth Knowles
>            Assignee: Luke Cwik
>
> Today, registering coders for auxiliary data types for a library transform is not very convenient. It the appears in an output/covariant position then it might be possible to use {{getDefaultOutputCoder}} to solve things. But for writes/contravariant positions this is not applicable and the library transform must contort itself to avoid requiring the user to come up with a coder for a type they don't own.
> Probably the best case today is an explicit call to {{LibraryTransform.registerCoders(Pipeline)}} which is far too manual.
> This could likely be solved quite easily with {{@AutoService}} and a static global coder registry, as we do with pipeline runners.



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