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https://issues.apache.org/jira/browse/NIFI-14584?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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David Handermann resolved NIFI-14584.
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Resolution: Won't Do
Superseded by changes in NIFI-14598 to correct handling of Kafka Consumer
Service instances.
> Add synchronization on consumers in ConsumeKafka
> ------------------------------------------------
>
> Key: NIFI-14584
> URL: https://issues.apache.org/jira/browse/NIFI-14584
> Project: Apache NiFi
> Issue Type: Improvement
> Components: Extensions
> Reporter: Alaksiej Ščarbaty
> Assignee: Alaksiej Ščarbaty
> Priority: Major
> Time Spent: 20m
> Remaining Estimate: 0h
>
> When Kafka flow in stateless mode times out (due to any reason), the
> _ConsumeKafka_ rollback ({_}commitAsync{_} callback) is called from another
> thread than the main thread of the flow.
> Due to the built in mechanism in _ClassicKafkaConsumer_ a
> _ConcurrentModificationException_ is thrown.
> Any interaction with a Kafka consumer should be synchronized.
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