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https://issues.apache.org/jira/browse/KAFKA-9679?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17216020#comment-17216020
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Sheikh Araf commented on KAFKA-9679:
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Hi [~bchen225242], did you get a chance to take a look at the PR? Let me know
if I'm on the right path or if the commit can be improved.
> Mock consumer should behave consistent with actual consumer
> -----------------------------------------------------------
>
> Key: KAFKA-9679
> URL: https://issues.apache.org/jira/browse/KAFKA-9679
> Project: Kafka
> Issue Type: Test
> Components: consumer, streams
> Reporter: Boyang Chen
> Assignee: Sheikh Araf
> Priority: Major
> Labels: help-wanted, newbie, newbie++
>
> Right now in MockConsumer we shall return illegal state exception when the
> buffered records are not able to find corresponding assigned partitions. This
> is not the case for KafkaConsumer where we shall just not return those data
> during `poll()` call. This inconsistent behavior should be fixed.
> Note that if we are going to take this fix, the full unit tests need to be
> executed to make sure no regression is introduced, as some tests are
> potentially depending on the current MockConsumer behavior.
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