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https://issues.apache.org/jira/browse/BEAM-1171?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17546295#comment-17546295
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Kenneth Knowles commented on BEAM-1171:
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This issue has been migrated to https://github.com/apache/beam/issues/18177
> Source.getDefaultOutputCoder() - add a version that allows access to a
> CoderRegistry
> ------------------------------------------------------------------------------------
>
> Key: BEAM-1171
> URL: https://issues.apache.org/jira/browse/BEAM-1171
> Project: Beam
> Issue Type: Bug
> Components: sdk-java-core
> Reporter: Stephen Sisk
> Priority: P3
> Labels: Clarified
>
> The Source API's getDefaultOutputCoder currently takes no parameters. This
> means that you can't access the coder registry to ask for coders based on the
> type.
> The PTransform API's version of getDefaultOutputCoder has 3 different form,
> which do allow access to the coder registry if necessary.
> However, while working on BEAM-1040 (Hadoop IO connector), we realized that a
> source does not always know it's output type, and thus will need to calculate
> the coder at run time. To do this, it would be helpful to have a reference to
> the CoderRegistry - we should look at what we're doing on PTransform and
> decide if we should port that over onto Source.
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