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Posted to issues@flink.apache.org by "Fabian Paul (Jira)" <ji...@apache.org> on 2022/05/03 08:20:00 UTC

[jira] [Assigned] (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 reassigned FLINK-27480:
-----------------------------------

    Assignee: Fabian Paul

> 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
>
> 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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