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https://issues.apache.org/jira/browse/KAFKA-9882?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17088908#comment-17088908
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Jesse Anderson commented on KAFKA-9882:
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subscribe() doesn't get a partition assignment until poll() is called. I
double-checked this just now.
Using this method would lead to quite a bit of complicated code. The listener
code would have to maintain a boolean to check if this is the first time the
onPartitionsAssigned method was called. It would have to flip the first time it
was called.
I think a more straightforward approach to getting partition assignments would
result in more readable and less buggy code.
> Add Block getAssignments()
> --------------------------
>
> Key: KAFKA-9882
> URL: https://issues.apache.org/jira/browse/KAFKA-9882
> Project: Kafka
> Issue Type: New Feature
> Components: clients
> Affects Versions: 2.5.0
> Reporter: Jesse Anderson
> Priority: Critical
>
> In 2.0, the KafkaConsumer poll(long) was deprecated and replaced with a
> poll(Duration). The poll(Duration) does not block for consumer assignments.
> Now, there isn't a blocking method that can get consumer assignments.
> A new KafkaConsumer method needs to be added that blocks while getting
> consumer assignments.
> The current workaround is to poll for a short amount of time in a while loop
> and check the size of assignment(). This isn't a great method of verifying
> the consumer assignment.
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