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https://issues.apache.org/jira/browse/KAFKA-16290?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17819144#comment-17819144
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Lucas Brutschy commented on KAFKA-16290:
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Subscription state is updated directly which may cause an illegal state
exception in
https://issues.apache.org/jira/browse/KAFKA-16227
> Investigate propagating subscription state updates via queues
> -------------------------------------------------------------
>
> Key: KAFKA-16290
> URL: https://issues.apache.org/jira/browse/KAFKA-16290
> Project: Kafka
> Issue Type: Task
> Components: clients, consumer
> Reporter: Lucas Brutschy
> Priority: Major
> Labels: kip-848
>
> We are mostly using the queues for interaction between application thread and
> background thread, but the subscription object is shared between the threads,
> and it is updated directly without going through the queues.
> The way we allow updates to the subscription state from both threads is
> definitely not right, and will bring trouble. Places like the assign() is
> probably the most obvious, where we send an event to the background to
> commit, but then update the subscription in the foreground right away.
> It seems sensible to aim for having all updates to the subscription state in
> the background, triggered from the app thread via events (and I think we
> already have related events for all updates, just that the subscription state
> was left out in the app thread).
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