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https://issues.apache.org/jira/browse/KAFKA-6717?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16522372#comment-16522372
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Steven Aerts commented on KAFKA-6717:
-------------------------------------
I think this problem is a duplicate of [KAFKA-7026].
> TopicPartition Assined twice to a consumer group for 2 consumer instances
> --------------------------------------------------------------------------
>
> Key: KAFKA-6717
> URL: https://issues.apache.org/jira/browse/KAFKA-6717
> Project: Kafka
> Issue Type: Bug
> Affects Versions: 0.11.0.1
> Reporter: Yuancheng PENG
> Priority: Major
>
> I'm using \{{StickyAssignor}} for consuming more than 100 topics with certain
> pattern.
> There are 10 consumers with the same group id.
> I expected that topic-partition to be assigned to only one consumer instance.
> However some topic partitions are assigned twice in 2 different difference
> instance, hence the consumer group process duplicate messages.
> {code:java}
> props.put(ConsumerConfig.PARTITION_ASSIGNMENT_STRATEGY_CONFIG,
> Collections.singletonList(StickyAssignor.class));
> KafkaConsumer<Record, Record> c = new KafkaConsumer<>(props);
> c.subscribe(Pattern.compile(TOPIC_PATTERN), new
> NoOpConsumerRebalanceListener());
> {code}
>
>
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