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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] [Commented] (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:comment-tabpanel&focusedCommentId=17533706#comment-17533706 ] 

Fabian Paul commented on FLINK-27480:
-------------------------------------

Merged in
 * master: f723242e2249b90da22867fde7f8fa99b3c9de98
 * release-1.15: f92da27b486ee555ac70b923fad9ca8784914397
 * release-1.14: df7206589f755d90950a3c6d1a986453faae6017

> 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
>
> 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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