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https://issues.apache.org/jira/browse/FLINK-28842?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17870916#comment-17870916
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Rich commented on FLINK-28842:
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{quote}In case you experience a warning with a stack trace containing
javax.management.InstanceAlreadyExistsException: kafka.consumer:[...], you are
probably trying to register multiple KafkaConsumers with the same client.id.
The warning indicates that not all available metrics are correctly forwarded to
the metrics system. You must ensure that a different client.id.prefix for every
KafkaSource is configured and that no other KafkaConsumer in your job uses the
same client.id.
https://nightlies.apache.org/flink/flink-docs-release-1.19/docs/connectors/datastream/kafka/#kafka-consumer-metrics
{quote}
It makes sense to add `client.id.prefix` to the KafkaSink to mitigate issues
like `javax.management.InstanceAlreadyExistsException`. Aligning with the
KafkaSource by using `prefix + subTaskId` is logical, and adding an atomic
counter (`prefix + subTaskId + atomicCounter`) ensures unique client IDs even
in pooled environments.
I am willing to take on this as an alternative PR if no one else volunteers.
> Add client.id.prefix for the KafkaSink
> --------------------------------------
>
> Key: FLINK-28842
> URL: https://issues.apache.org/jira/browse/FLINK-28842
> Project: Flink
> Issue Type: New Feature
> Components: Connectors / Kafka
> Affects Versions: 1.15.1
> Reporter: Yaroslav Tkachenko
> Assignee: Yaroslav Tkachenko
> Priority: Major
> Labels: pull-request-available, stale-assigned
>
> Currently, KafkaSink doesn't provide a way to configure a client.id.prefix
> like KafkaSource does. client.id is as important for Kafka Producers, so it
> makes sense to implement the missing logic for the KafkaSink.
> A similar implementation that leverages subtaskId for uniqueness can be used
> here.
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