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https://issues.apache.org/jira/browse/BEAM-12995?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17425496#comment-17425496
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Hubert S commented on BEAM-12995:
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Our observatioin shows that two consumers from the same consumer group can
consume the same message from topic when we use assign() method instead of
subscribe().
Can we achieve the same behaviour like for subscribe() method in or beam
pipeline using KafkaIO?
> Consumer group with random prefix
> ---------------------------------
>
> Key: BEAM-12995
> URL: https://issues.apache.org/jira/browse/BEAM-12995
> Project: Beam
> Issue Type: Bug
> Components: io-java-kafka
> Affects Versions: 2.32.0
> Reporter: Hubert S
> Priority: P2
>
> I'm running two beam pipelines on Apache Flink which read messages from the
> same Kafka topic by using KafkaIO. Both of them are in the same consumer
> group, so in my understanding each message should be consumed by either
> pipeline (but not both) but I observed that the same set of messages is
> consumed by each pipeline, meaning each message is processed at least twice.
> I can see in the log that additional consumer group with prefix
> "Reader-1_offset_consumer_<random_number>_" was created and also consume
> messages.
> Could you explain what should I do to consume messages only once by one
> consumer group and why that additional group was created?
> Similar issue: BEAM-12880
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