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https://issues.apache.org/jira/browse/BEAM-1936?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17546499#comment-17546499
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Kenneth Knowles commented on BEAM-1936:
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This issue has been migrated to https://github.com/apache/beam/issues/18364
> Allow user provided function to extract custom timestamp from payload in
> pubsubIO
> ---------------------------------------------------------------------------------
>
> Key: BEAM-1936
> URL: https://issues.apache.org/jira/browse/BEAM-1936
> Project: Beam
> Issue Type: New Feature
> Components: io-java-gcp
> Reporter: Keith Berkoben
> Priority: P3
>
> Currently the PubsubIO runner only allows the caller to set a custom
> timestamp if the timestamp is defined in the attributes of the message. This
> can be problematic when the user does not control the publisher. In such a
> case, proper windowing of data requires the timestamp to be pulled out of the
> message payload.
> Since a payload could have arbitrary data, the user would have to provide a
> Function<T, String>() that would extract the timestamp from the payload:
> PubsubIo.Read.timestampLabel(Function<T, String> extractor);
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