Bruno Cadonna created KAFKA-16285:
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Summary: 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
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.
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