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https://issues.apache.org/jira/browse/BEAM-12942?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17419231#comment-17419231
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Sam Whittle commented on BEAM-12942:
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The validation seems like it could be helpful for other non-specialized
PubsubIO because it would throw an exception when the message is produced
instead of exception from pubsub publish result which could correspond to a
batch and thus has less context.
> Dataflow runner specialization of PubsubIO should validate messages
> -------------------------------------------------------------------
>
> Key: BEAM-12942
> URL: https://issues.apache.org/jira/browse/BEAM-12942
> Project: Beam
> Issue Type: Improvement
> Components: runner-dataflow
> Reporter: Sam Whittle
> Assignee: Sam Whittle
> Priority: P2
>
> Currently invalid messages, such as those with attributes exceeding the
> maximum size are processed by the bundle successfully but fail to commit.
> Throwing an exception when trying to write such a message directly would
> increase visibility as well as allowing users to catch and handle such
> exceptions.
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