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Posted to issues@flink.apache.org by "Fabian Paul (Jira)" <ji...@apache.org> on 2022/05/09 08:59:00 UTC
[jira] [Closed] (FLINK-27480) KafkaSources sharing the groupId might lead to InstanceAlreadyExistException warning
[ https://issues.apache.org/jira/browse/FLINK-27480?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Fabian Paul closed FLINK-27480.
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> KafkaSources sharing the groupId might lead to InstanceAlreadyExistException warning
> ------------------------------------------------------------------------------------
>
> Key: FLINK-27480
> URL: https://issues.apache.org/jira/browse/FLINK-27480
> Project: Flink
> Issue Type: Improvement
> Components: Connectors / Kafka
> Affects Versions: 1.15.0, 1.14.4, 1.16.0
> Reporter: Fabian Paul
> Assignee: Fabian Paul
> Priority: Major
> Labels: pull-request-available
> Fix For: 1.16.0, 1.14.5, 1.15.1
>
>
> More and more frequently, users ran into an issue by not correctly configuring the KafkaSource ([https://stackoverflow.com/questions/72026997/flink-instancealreadyexistsexception-while-migrating-to-the-kafkasource)] and setting non-distinguishable groupIds for the source. Internally the used KafkaConsumer tries to register with the metric system and incorporates the groupId as part of the metric, leading to name collision.
> We should update the documentation to explain the situation properly.
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