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https://issues.apache.org/jira/browse/BEAM-7716?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17302843#comment-17302843
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Kenneth Knowles commented on BEAM-7716:
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I don't have any expertise on that experiment. I assume it unlocks some
functionality not available in the built-in source?
It seems to date back 5 years, to
https://github.com/apache/beam/commit/26941f152cb5bed422ff14ccb10403604a611130,
which is when we had bad git practices that hide the actual code review history.
> PubsubIO returns empty message bodies for all messages read
> -----------------------------------------------------------
>
> Key: BEAM-7716
> URL: https://issues.apache.org/jira/browse/BEAM-7716
> Project: Beam
> Issue Type: Bug
> Components: io-java-gcp
> Reporter: Steve Niemitz
> Priority: P1
>
> {quote}Both the JSON and gRPC implementation return empty message bodies for
> all messages read (using readMessages). When running with the
> dataflow-specific reader, this doesn't happen and the message bodies have the
> content as expected. I took a pipeline that works as expected on dataflow
> using PubsubIO.Read, added the experiment flag, and then my pipeline broke
> from empty message bodies. This obviously blocked me from really
> experimenting much more.{quote}
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