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https://issues.apache.org/jira/browse/BEAM-6466?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17342133#comment-17342133
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Boyuan Zhang commented on BEAM-6466:
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The unbounded-as-bounded-read goes different expansion comparing to normal
unbounded-read. In short, the unbounded-as-bounded-read performs more like a
DoFn(https://github.com/apache/beam/blob/master/sdks/java/core/src/main/java/org/apache/beam/sdk/io/BoundedReadFromUnboundedSource.java#L94-L121),
where there is no finalizeCheckpoint contract. So instead of a bug, this looks
more like a FR on unbounded-as-bounded-read to me.
> KafkaIO doesn't commit offsets while being used as bounded source
> -----------------------------------------------------------------
>
> Key: BEAM-6466
> URL: https://issues.apache.org/jira/browse/BEAM-6466
> Project: Beam
> Issue Type: Bug
> Components: io-java-kafka
> Affects Versions: 2.9.0
> Reporter: Alexey Romanenko
> Priority: P1
>
> While using KafkaIO as bounded source (with {{withMaxReadTime()}} or
> {{withMaxNumRecords()}}) it seems doesn't commit offsets all the time.
> See the details in [the
> discussion|https://lists.apache.org/thread.html/bcec8a1fb166029a4adf3f3491c407d49843406020b20f203ec3c2d2@%3Cuser.beam.apache.org%3E]
> on user@list.
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