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https://issues.apache.org/jira/browse/KAFKA-16285?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Kirk True updated KAFKA-16285:
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Priority: Critical (was: Major)
> Make group metadata available when a new assignment is set in async Kafka
> consumer
> ----------------------------------------------------------------------------------
>
> Key: KAFKA-16285
> URL: https://issues.apache.org/jira/browse/KAFKA-16285
> Project: Kafka
> Issue Type: Improvement
> Components: clients, consumer
> Reporter: Bruno Cadonna
> Assignee: Bruno Cadonna
> Priority: Critical
> Labels: kip-848-client-support
>
> Currently, the new async Kafka consumer sends an event from the background
> thread to the application thread when the group metadata is updated. Group
> metadata is updated when the background thread receives a new assignment.
> More specifically, the member epoch is updated each time a new assignment is
> received and and the member ID is updated with the first assignment.
> In contrast to the group metadata update, the assignment is directly set in
> the subscription without sending an update event from the background thread
> to the application thread. That means that there is a delay between the
> application thread being aware of the update to the assignment and the
> application thread being aware of the update to the group metadata. This
> behavior differs with respect to the legacy consumer were the assignment and
> the group metadata is updated at the same time.
> We should make the update to the group metadata available to the application
> thread when the update to the assignment is made available to the application
> thread so that assignment an group metadata are in sync.
> For example, {{producer.sendOffsetsToTransaction(offsetsToCommit,
> groupMetadata);}} benefits from this improvement because if the offsets to
> commit are consistent with the current assignment also the group metadata
> would be. Currently, that is not guaranteed.
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