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https://issues.apache.org/jira/browse/BEAM-7691?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16878456#comment-16878456
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Ismaël Mejía commented on BEAM-7691:
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Probably add doc on this to the PTransform style guide and the fact that this
should be included in the tests too is a good idea.
> UnboundedSource.CheckpointMark should mention that implementations should be
> Serializable or have have an associated Coder
> --------------------------------------------------------------------------------------------------------------------------
>
> Key: BEAM-7691
> URL: https://issues.apache.org/jira/browse/BEAM-7691
> Project: Beam
> Issue Type: Improvement
> Components: sdk-java-core
> Reporter: Ismaël Mejía
> Priority: Minor
> Labels: documentation, javadoc
>
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