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https://issues.apache.org/jira/browse/BEAM-72?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17545936#comment-17545936
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Danny McCormick commented on BEAM-72:
-------------------------------------
This isn't actually real, but this issue has been migrated to
https://github.com/apache/beam/issues/17847
> Source design pattern: option to retain metadata
> ------------------------------------------------
>
> Key: BEAM-72
> URL: https://issues.apache.org/jira/browse/BEAM-72
> Project: Beam
> Issue Type: New Feature
> Components: sdk-java-core
> Reporter: Dan Halperin
> Priority: P3
> Labels: Clarified
>
> * FileBasedSource: user may want to know original path, directory, line
> number, byte offset, etc.
> * PubSubIO: user may want to know things about the originating message (such
> as metadata attributes), not just they payload. BEAM-53
> * etc.
> We should have a standard pattern for this that provides a good guideline for
> implementing sources.
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